KR101557229B1 - Surface plasmon polariton logic circuit elements capable of various logic operations and method for logic operation thereof - Google Patents

Abstract

A plasmonic logic element according to embodiments of the present invention comprises: an input binding plasmonic waveguide formed in a shape of a single combined metal strip before N metal strips in which input surface plasmon polariton (SPP) signals of N prescribed binding modes are excited at input locations reach a gap starting location; an output plasmonic waveguide formed in a metal strip shape extended from a gap ending location to an output location to propagate an output SPP signal of a prescribed binding mode; a dielectric layer which is brought into contact with each metal surface of the input binding plasmonic waveguide and the output plasmonic waveguide to form metal-dielectric boundary surfaces; and a TE mode control optical signal waveguide which directs a TE mode control optical signal to enter a gap between the input binding plasmonic waveguide and the output plasmonic waveguide from the gap starting location to the gap ending location in a direction perpendicular to a propagation direction of the input SPP signals. The TE mode control optical signal can be activated or deactivated depending on a type of a logic operation or the type of the logic operation and logic values of the input SPP signals, and polarized to form an electric field in a parallel direction with the propagation direction of the input SPP signals.

Description

TECHNICAL FIELD [0001] The present invention relates to a plasmonic logic device capable of performing various logical operations, and a logic operation method using the same.

The present invention relates to a surface plasmon polariton, and more particularly, to a plasmonic logic device.

Plasmon refers to pseudo-particles for treating such vibrations as if they were a single particle when free electrons in the metal collectively oscillate under certain conditions. When plasmons are localized to the surface of the metal, they are called surface plasmons.

Surface plasmon resonance is called surface plasmon resonance when light from the visible to near-infrared band enters the metal surface and the surface plasmon interacts with the surface plasmon at a specific wavelength. This phenomenon is characterized by the golden color of gold Or a smooth metal surface is a fundamental principle that shows a distinctive metallic luster.

In particular, when a surface plasmon is generated in a metal thin film through strong interaction with a photon incident in a TM mode at the interface between the metal thin film and the dielectric, a near field propagating along with the surface plasmon appears along the interface. Surface waves are treated as one similar particle and are called surface plasmon polaritons (SPP).

On the other hand, in general, optically diverse visible-infrared band light generally has advantages of high operating speed, wide bandwidth, non-coherence, low loss, etc. However, in order to positively utilize it in the information technology field, Problems and problems of light control should be solved. The problem of densities is due to fundamental constraints, called the diffraction limit of light, that light waves can not be focused in a range smaller than the wavelength. Accordingly, the limit of the line width in the integrated optics is about 0.5 to 1 占 퐉, which is much larger than 10 to 100 nm that can be achieved by the latest semiconductor technology.

On the other hand, the surface plasmon polariton (SPP) is able to overcome the optical diffraction limit because the energy of the light wave is strongly focused within a range narrower than the wavelength of the light wave incident from the metal thin film and the dielectric interface. Techniques and fields for constraining, propagating, transmitting, receiving, distributing, combining, reflecting, filtering, or analog-to-digital operations of SPP waves using these characteristics are referred to as plasmonics.

However, it is not easy to implement SPP mode generation, transmission / reception, transmission, replication, amplification and switching because of strong linearity due to SPP's characteristic longitudinal wave property.

Furthermore, implementing analog or digital arithmetic in SPP modes is more difficult, and there are few successful examples.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a plasmonic logic element and a logic operation method capable of performing various logical operations.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a plasmonic logic element and a logic operation method capable of performing an AND operation.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a plasmonic logic element and a logic operation method capable of performing an OR operation.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a plasmonic logic element and a logic operation method capable of XOR operation.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a plasmonic logic device and a logic operation method capable of buffer operation.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a plasmonic logic element and a logic operation method capable of performing a NOT operation.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a plasmonic logic device and a logic operation method capable of NAND operation.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a plasmonic logic device and a logic operation method capable of NOR operation.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a plasmonic logic element and a logic operation method capable of performing an XNOR operation.

The solution to the problem of the present invention is not limited to those mentioned above, and other solutions not mentioned can be clearly understood by those skilled in the art from the following description.

A plasmonic logic device according to an aspect of the present invention includes:

 an input coupled plasmonic waveguide (PPS) in which n metal strips excited at respective input positions of input surface plasmon polariton (SPP) signals of n predetermined coupling modes are integrated into one metal strip before reaching the gap start position, ;

An output plasmon waveguide implemented in the form of a metal band extending from the gap end position to the output position so that the output SPP signal of the predetermined coupling mode can propagate;

A dielectric layer in contact with respective metal surfaces of the input coupled plasmonic waveguide and the output plasmonic waveguide to form metal-dielectric interfaces; And

A TE mode control optical signal is input to a gap formed between the input coupling plasmon waveguide and the output plasmon waveguide from the gap start position to the gap end position in a direction orthogonal to a traveling direction of input SPP signals, A control optical signal waveguide,

Wherein the TE mode control optical signal is activated or deactivated according to the type of logic operation or according to the type of logic operation and the logic values of the input SPP signals and is polarized to form an electric field in a direction parallel to the traveling direction of the input SPP signals .

According to one embodiment, the type of the logic operation is an AND operation,

The TE mode control optical signal is activated when the logical values of the input SPP signals are different from each other,

When the input SPP signals are all "1 ", the output SPP signal is outputted as" 1 ", otherwise, the output SPP signal is outputted as "0 ".

According to one embodiment, the type of the logical operation is an OR operation,

The TE mode control optical signal is inactivated regardless of the logic values of the input SPP signals, and when at least one of the input SPP signals is "1 ", the output SPP signal is output as" 1 &Quot; 0 ", the output SPP signal may be output as "0 ".

According to one embodiment, the type of logic operation is an XOR operation,

The TE mode control optical signal is deactivated when any one of the logical values of the input SPP signals is "0 ", otherwise it is activated,

If the input SPP signals are different from each other, the output SPP signal is output as "1 ", and if the input SPP signals are equal to each other, the output SPP signal may be output as" 0 ".

According to one embodiment, the type of logic operation is a buffer operation,

The TE mode control optical signal is inactivated regardless of the logic value of the input SPP signal, and when the input SPP signal is "1", the output SPP signal is output as "1" and the input SPP signal is "0" The output SPP signal may be output as "0 ".

According to another aspect of the present invention, there is provided a plasmonic logic operation method using a plasmonic logic device,

Wherein the plasmonic logic device comprises:

and an output plasmon waveguide disposed with a gap of a predetermined gap length interposed therebetween with respect to the input coupled plasmon waveguide in which n metal strips are combined into one metal strip before reaching the gap start position,

The plasmonic logic operation method includes:

Each of the TM mode electromagnetic waves corresponding to logical values of respective input surface plasmon polariton (SPP) signals at n input positions of the input coupled plasmon waveguide is excited to generate n input SPP signals of a predetermined coupling mode ;

TE mode to be activated or deactivated according to the type of logic operation or according to the type of logic operation and the logic values of the input SPP signals and also to form an electric field parallel to the traveling direction of the input SPP signals TE mode Polarized TE mode control Introducing an optical signal into a gap; And

And outputting an output SPP signal excited by the output plasmon waveguide at an output position of the output plasmonic waveguide as the input SPP signals are passed or blocked by the gap by the TE mode control optical signal have.

According to one embodiment, the type of the logic operation is an AND operation,

The TE mode control optical signal is activated when the logical values of the input SPP signals are different from each other,

When the input SPP signals are all "1 ", the output SPP signal is outputted as" 1 ", otherwise, the output SPP signal is outputted as "0 ".

According to one embodiment, the type of the logical operation is an OR operation,

The TE mode control optical signal is inactivated regardless of the logic values of the input SPP signals, and when at least one of the input SPP signals is "1 ", the output SPP signal is output as" 1 &Quot; 0 ", the output SPP signal may be output as "0 ".

According to one embodiment, the type of logic operation is an XOR operation,

The TE mode control optical signal is deactivated when any one of the logical values of the input SPP signals is "0 ", otherwise it is activated,

If the input SPP signals are different from each other, the output SPP signal is output as "1 ", and if the input SPP signals are equal to each other, the output SPP signal may be output as" 0 ".

According to one embodiment, the type of logic operation is a buffer operation,

The TE mode control optical signal is inactivated regardless of the logic value of the input SPP signal, and when the input SPP signal is "1", the output SPP signal is output as "1" and the input SPP signal is "0" The output SPP signal may be output as "0 ".

According to another aspect of the present invention, there is provided a plasma-

n metal strips in which input surface plasmon polariton (SPP) signals of n predetermined coupling modes are excited at respective input positions and one metal strip excited at one input port of the control SPP signal of one predetermined coupling mode An input coupled plasmonic waveguide implemented in a form of being integrated into one metal band before reaching the position;

An output plasmon waveguide implemented in the form of a metal band extending from the gap end position to the output position so that the output SPP signal of the predetermined coupling mode can propagate;

A dielectric layer in contact with respective metal surfaces of the input coupled plasmonic waveguide and the output plasmonic waveguide to form metal-dielectric interfaces; And

A TE mode control optical signal is input to a gap formed between the input coupling plasmon waveguide and the output plasmon waveguide from the gap start position to the gap end position in a direction orthogonal to a traveling direction of input SPP signals, A control optical signal waveguide,

The logical value of the control SPP signal is "1" when all of the input SPP signals are "0 &

The TE mode control optical signal is activated or deactivated according to the type of logic operation or according to the logic values of the input SPP signals or the type of logic operation and is polarized to form an electric field in a direction parallel to the traveling direction of the input SPP signals .

According to one embodiment, the type of logic operation is a NOT operation,

The TE mode control optical signal is deactivated if the logical value of the input SPP signal is "0 ", otherwise it is activated,

When the input SPP signal is "1", the output SPP signal is output as "0", and when the input SPP signal is "0", the output SPP signal may be outputted as "1".

According to one embodiment, the type of logic operation is a NAND operation,

The TE mode control optical signal is inactivated if the logical values of the input SPP signals are both "0" or different from each other, and are activated when the logical values of the input SPP signals are all "1 &

When the input SPP signals are all "1 ", the output SPP signal is output as" 0 ", otherwise, the output SPP signal is output as "1 ".

According to one embodiment, the type of logic operation is a NOR operation,

The TE mode control optical signal is deactivated if the logical values of the input SPP signals are all "0 ", otherwise,

The output SPP signal may be output as "1" only when all of the input SPP signals are "0", otherwise the output SPP signal may be output as "0".

According to one embodiment, the type of logic operation is an XNOR operation,

The TE mode control optical signal is inactivated when the logical values of the input SPP signals are both "0" or all "1 ", and are activated when the logical values of the input SPP signals are different from each other,

If the logical values of the input SPP signals are all the same, the output SPP signal is output as "1 ", otherwise, the output SPP signal may be output as" 0 ".

According to one embodiment, the logical value of the control SPP signal may always be "1 ".

According to another aspect of the present invention, there is provided a plasmonic logic operation method using a plasmonic logic device,

Wherein the plasmonic logic device comprises:

and an output plasmon waveguide disposed with a gap of a predetermined gap length interposed therebetween with respect to the input coupled plasmon waveguide, which is a form in which n + 1 metal strips are combined into one metal band before reaching the gap start position,

The plasmonic logic operation method includes:

Each of the TM mode electromagnetic waves corresponding to the logical values of respective input surface plasmon polariton (SPP) signals at n input locations of the input coupled plasmon waveguide is excited, and input SPP signals of n predetermined coupling modes ;

Exciting a TM mode electromagnetic wave corresponding to a logic value of control SPP signals at one input position of the input coupled plasmon waveguide to generate a control SPP signal of one predetermined coupling mode;

TE mode to be activated or deactivated according to the type of logic operation or according to the type of logic operation and the logic values of the input SPP signals and also to form an electric field parallel to the traveling direction of the input SPP signals TE mode Polarized TE mode control Introducing an optical signal into a gap; And

And an output SPP signal excited by the output plasmon waveguide is output at an output position of the output plasmon waveguide as the input SPP signals and the control SPP signal are passed or blocked by the gap by the TE mode control optical signal .

According to one embodiment, the type of logic operation is a NOT operation,

The TE mode control optical signal is deactivated if the logical value of the input SPP signal is "0 ", otherwise it is activated,

When the input SPP signal is "1", the output SPP signal is output as "0", and when the input SPP signal is "0", the output SPP signal may be outputted as "1".

According to one embodiment, the type of logic operation is a NAND operation,

The TE mode control optical signal is inactivated if the logical values of the input SPP signals are both "0" or different from each other, and are activated when the logical values of the input SPP signals are all "1 &

When the input SPP signals are all "1 ", the output SPP signal is output as" 0 ", otherwise, the output SPP signal is output as "1 ".

According to one embodiment, the type of logic operation is a NOR operation,

The TE mode control optical signal is deactivated if the logical values of the input SPP signals are all "0 ", otherwise,

The output SPP signal may be output as "1" only when all of the input SPP signals are "0", otherwise the output SPP signal may be output as "0".

According to one embodiment, the type of logic operation is an XNOR operation,

The TE mode control optical signal is inactivated when the logical values of the input SPP signals are both "0" or all "1 ", and are activated when the logical values of the input SPP signals are different from each other,

If the logical values of the input SPP signals are all the same, the output SPP signal is output as "1 ", otherwise, the output SPP signal may be output as" 0 ".

According to one embodiment, the logical value of the control SPP signal may always be "1 ".

According to the plasmonic logic device and logic operation method of the present invention, various logical operations can be implemented with SPP signals.

According to the plasmonic logic device and logic operation method of the present invention, an AND operation can be implemented with SPP signals.

According to the plasmonic logic device and logic operation method of the present invention, an OR operation can be implemented with SPP signals.

According to the plasmonic logic device and logic operation method of the present invention, an XOR operation can be implemented with SPP signals.

According to the plasmonic logic device and the logic operation method of the present invention, the buffer operation can be realized by the SPP signal.

According to the plasmonic logic device and logic operation method of the present invention, a NOT operation can be implemented with SPP signals.

According to the plasmonic logic device and the logic operation method of the present invention, a NAND operation can be implemented with SPP signals.

According to the plasmonic logic device and logic operation method of the present invention, NOR operation can be implemented with SPP signals.

According to the plasmonic logic device and logic operation method of the present invention, an XNOR operation can be implemented with SPP signals.

The effects of the present invention are not limited to those mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description.

FIG. 1 is a conceptual diagram illustrating exemplary waveguide structures in a plasmonic logic device according to an embodiment of the present invention. Referring to FIG.
FIG. 2 is a conceptual diagram illustrating exemplary surface plasmon polariton modes that can be driven in a plasmonic logic device according to an embodiment of the present invention.
FIGS. 3, 4, and 5 are conceptual diagrams illustrating plasmonic logic elements of three structures having a discontinuous waveguide separated by a gap according to an embodiment of the present invention, respectively.
FIGS. 6, 7 and 8 are schematic diagrams showing the transmission of the surface plasmon polariton mode in the gap when the TE mode polarized control light is incident on the gap of each of the discontinuous waveguides of three structures, according to an embodiment of the present invention These are conceptual diagrams that illustrate the disturbed phenomenon.
9 is a conceptual diagram illustrating a plasmonic logic device according to an embodiment of the present invention.
10 is a flowchart illustrating a logic operation method using a plasmonic logic device according to an embodiment of the present invention.
11 is a conceptual diagram illustrating a plasmonic logic device according to another embodiment of the present invention.
12 is a flowchart illustrating a logic operation method using a plasmonic logic device according to another embodiment of the present invention.

For the embodiments of the invention disclosed herein, specific structural and functional descriptions are set forth for the purpose of describing an embodiment of the invention only, and it is to be understood that the embodiments of the invention may be practiced in various forms, The present invention should not be construed as limited to the embodiments described in Figs.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same reference numerals are used for the same constituent elements in the drawings and redundant explanations for the same constituent elements are omitted.

FIG. 1 is a conceptual diagram illustrating exemplary waveguide structures in a plasmonic logic device according to an exemplary embodiment of the present invention, and FIG. 2 is a schematic diagram illustrating a surface plasmon device, which can be driven in a plasmonic logic device according to an embodiment of the present invention. These are conceptual diagrams that illustrate polariton modes in an illustrative manner.

In general, the wave vector of the SPP mode is larger than the wavenumber vector of the electromagnetic wave transmitted by the peripheral dielectric material. Therefore, the SPP mode is the electromagnetic wave confined within the near surface of the metal surface, and the SPP waveguide has the metal- Dimensional planar waveguide as a kind of two-dimensional planar waveguide having a core.

However, since the electric field of the SPP mode propagating in the general shape metal-dielectric interface exists to a considerable depth in the metal, the propagation loss is very large. Therefore, the traveling distance of the SPP mode in the visible light band is as short as several tens of micrometers.

However, if the metal is made into a very thin thin film of several tens of nanometers and the two SPPs are spatially overlapped on both surfaces of the metal thin film, the propagation distance of the SPP mode can theoretically increase infinitely.

Considering a lithograph process, which is the most suitable technique in reality, a general nano plasmonic integrated circuit (NPIC) or a plasmonic device implemented using the SPP coupling mode can be classified into a rectangular strip- And may be based on a plasmonic waveguide structure including a dielectric layer surrounding it.

This plasmonic waveguide structure can be largely classified into three types: an insulator-metal-insulator (IMI) structure in which a metal thin film is formed and an insulator-metal-insulator structure in which two metal thin films are formed in close proximity and in parallel, metal-insulator-metal-insulator (IMIMI) structure, and a thick metal-insulator-metal (MIM) structure that forms thick metal lines very closely and parallel.

Furthermore, it is possible to combine plasmonic waveguides of these three structures, for example, waveguides of a complex structure such as an IMI-IMIMI structure or an MIM-IMIMI structure.

The SPP coupling mode is a symmetric mode in which the distributions of the magnetic fields of two thin film surfaces are symmetrical with each other according to the distribution of the magnetic field on the two surfaces of the metal thin film and an asymmetric mode -symmetric mode).

Especially, the symmetric mode propagates most of the energy of the mode on the peripheral dielectric rather than the inside of the metal thin film, so the loss of metal is small and the propagation loss is greatly reduced. The mode that can propagate to long distance including this symmetric mode is called long range SPP (Long Range SPP, LRSPP) mode.

Even in the asymmetric mode, since the energy of the SPP mode propagates on the core dielectric mainly in the specific waveguide structure, the propagation loss is likewise very small and can be transmitted to a long distance.

On the other hand, it is known that, in the IMI structure waveguide, excitation of long-range SPP exists only when the dielectric constant difference between the two side dielectrics contacting the both interfaces of the metal thin film is almost equal to 10 ^-4 or less.

In the case of the IMIMI structure waveguide, the long-range SPP can be excited even if the dielectric constant of the core dielectric layer between the two metal thin films and the cladding layer outside the respective metal thin films is different, and the thickness and permittivity of the core dielectric layer can be controlled, It is known that the propagation loss, the effective refractive index, and the distribution of the mode can be controlled.

In the case of the MIM structure waveguide, the characteristics of the SPP mode can be adjusted according to the dielectric constant, thickness and width of the core dielectric layer between the two thick metal layers.

The metal material for implementing the plasmonic waveguide may be selected from noble metals and transition metals.

The dielectric layer may be selected from silicon (Si), silicon dioxide (SiO ₂ ), silicon nitride (Si ₃ N ₄ ) and polymers.

In Fig. 2, the IMI waveguide has two modes of symmetry and asymmetry, namely, s ₀ mode and a ₀ mode. First, the s ₀ mode is a symmetric mode. If the propagation loss is small and the thickness is sufficiently thin, Size mode size and can be considered to be directly coupled to the optical fiber (butt joint). However, the a ₀ mode is an asymmetric mode, and although the size of the mode can be less than the diffraction limit of light, the size is small, but the propagation loss is very large and it is difficult to be excited by the direct coupling with the optical fiber.

Next, in the MIM waveguide, the Gs ₀ mode and the Ga ₀ mode are possible. Where G denotes the dielectric layer (I) filling between the thick metal layers (MM).

In the case of the Gs ₀ mode, a magnetic field is formed symmetrically around the midplane of the core dielectric layer of the MIM waveguide so that the mode size is determined by the core dielectric layer thickness and width between the two metal layers. A mode having a size can be formed. Furthermore, since the SPP mode is guided along the core dielectric layer, the propagation loss is very small as compared with the asymmetric mode of the IMI waveguide, thereby enabling a large-scale highly integrated device.

In the case of IMIMI waveguide, each s ₀ mode is Ss ₀ mode, two metal films each s ₀ mode As ₀ mode, each of the a ₀ mode, two metal thin film to be formed into the asymmetrical type which is formed symmetrically on both the metal thin film Sa is the mode _0, each of the a ₀ mode, two metal thin film is formed in a symmetric mode ₀ Aa formed in asymmetric possible.

Among these modes, the Ss ₀ mode has a slightly smaller mode size and a larger propagation loss than the I ₀ s ₀ mode. s ₀ mode and Ss ₀ mode is equal to the shape of the magnetic field in the cladding layer it is advantageous for the coupling to each other.

Sa ₀ mode has a similar mode size and propagation loss and Gs ₀ mode of the MIM waveguide.

In the case of the As ₀ mode and the Aa ₀ mode in which the magnetic fields are asymmetrically distributed, although it can form a very small mode, the propagation loss is very large and is not suitable.

Therefore, in the remainder of this specification, unless specifically stated otherwise, the SPP mode may be divided into the s ₀ mode, the Gs ₀ mode, the Ss ₀ mode, and the Sa ₀ mode having a small mode size and a small propagation loss, But should be understood to mean a mode that is relatively advantageous in the structure of the waveguide.

FIGS. 3 to 5 are conceptual diagrams illustrating plasmonic logic elements of three structures having a discontinuous waveguide separated by a gap according to an embodiment of the present invention, respectively.

Referring to FIG. 3, there is illustrated a plasmonic device having a discontinuous IMI waveguide in which a gap exists in a waveguide of a single metal thin film (IMI) structure.

Typically, SPP is a longitudinal wave electromagnetic wave propagating along a metal-dielectric interface, and it is difficult to control the direction or intensity of the propagation direction as it is strong. Although the SPP is an electromagnetic wave, which is described by Maxwell's equation as in electromagnetic, it can be controlled with refraction or reflection by using an optical material. However, optical materials are difficult to integrate, and even optical materials having variable physical properties that can be used for switching and the like are not practical because of excessive power required for physical property change.

On the other hand, the plasmonic devices having discontinuous waveguides according to the present invention have a gap in the middle of the waveguide extension direction and enter the TE polarized control optical signal in the gap perpendicular to the traveling direction of the input SPP signal, It is possible to perform an operation of outputting the on / off switched output SPP signal by controlling whether the gap is passed or not.

The discontinuous IMI waveguide plasmonic logic device 30 includes a first IMI plasmonic waveguide 31, which is a flat, long strip-shaped metal thin film having a width Wi and a first length di starting from an input position, and a second IMI plasmonic waveguide 32 which is a flat, long strip-shaped metal thin film.

A pair of first metal surfaces of the metal thin film constituting the first IMI plasmonic waveguide 31 are in contact with the cladding dielectric layer 33 so as to propagate the surface plasmon polaritons (SPP) in the symmetric mode or the asymmetric mode, Of the first metal-dielectric interface.

When the TM polarized photon is incident on the input position Xi of the first IMI plasmonic waveguide 31, that is, when a polarization is generated so as to form a magnetic field parallel to the first metal-dielectric interface of the first IMI plasmonic waveguide 31, The surface plasmon polaritons propagate along the first metal-dielectric interface between the first IMI plasmonic waveguide 31 and the cladding dielectric layer 33 in the symmetric mode (s ₀ ). To this end, the clad dielectric layer 33 may have a thickness such that the magnetic field of the surface plasmon polariton can be properly formed in the symmetrical mode (s ₀ ) and the metal thin film can be physically or chemically protected.

The schematic diagram superimposed on the first and second IMI plasmonic waveguides 31 and 32 symbolizes the coupling mode SPP in progress along the waveguide in the form of the magnetic field distribution of the coupling mode SPP. Combined Mode The arrows in front of the SPP indicate the direction of travel of the SPP.

The gap 34 starts from the gap start position at which the first IMI plasmonic waveguide 31 ending from the input position is made to have a length equal to the first length di, And is filled with dielectric by a gap length dc which is the distance between the gap start position and the gap end position.

A pair of second metal surfaces of the metal thin film constituting the second IMI plasmonic waveguide 32 are also in contact with the cladding dielectric layer 33 so as to propagate the surface plasmon polariton in the symmetric mode or the asymmetric mode, Thereby forming second metal-dielectric interfaces.

Next, the phenomenon occurring in the gap 34 will be examined. When the coupling mode SPP reaches the gap start position of the gap 34, the electromagnetic wave of the TM mode is excited at the gap end position of the second IMI plasmon waveguide 32 by the electromagnetic wave of the SPP, similar to the SPP.

It appears as though SPP, a pseudo particle, appears again in the second IMI plasmonic waveguide 32, starting at the gap end position, across the gap 34 passing through the dielectric material filled in the gap 34 region.

The TM mode electromagnetic waves excited in the second IMI plasmonic waveguide 32 propagate along a pair of second metal-dielectric interfaces of the second IMI plasmonic waveguide 32.

Referring to FIG. 4, there is illustrated a plasmonic element having a discontinuous IMIMI waveguide in which a gap exists in a waveguide of a double metal thin film (IMIMI) structure.

The discontinuous IMIMI waveguide plasmonic device 40 comprises a first IMIMI plasmonic waveguide 41 consisting of two adjacent metal thin films of flat and long strips having a width Wi and a first length di starting at the input position, And a second IMIMI plasmonic waveguide 42 composed of two adjacent metal thin films of flat and long strips of a second length do.

The two pairs of first metal surfaces of the pair of metal thin films constituting the first IMIMI plasmonic waveguide 41 are connected to the cladding dielectric layer 43 so that the surface plasmon polaritons SPP of the symmetric mode or the asymmetric mode can propagate. And core dielectric layer 45 to form two pairs of first metal-dielectric interfaces.

When the TM polarized photon is incident on the input position Xi of the first IMIMI plasmonic waveguide 41, the surface plasmon polariton is converted into a symmetric symmetric mode (Ss ₀ ) or a symmetric asymmetric mode (Sa ₀ ) Propagates along the two pairs of first metal-dielectric interfaces between the mononic waveguide 41 and the cladding dielectric layer 43 and the core dielectric layer 45.

The gap 44 starts from the gap start position at which the first IMIMI plasmonic waveguide 41 ending from the input position is made to have a length equal to the first length di and is spaced apart from the gap that the second IMIMI plasmonic waveguide 42 starts And is filled with dielectric by a gap length dc which is the distance between the gap start position and the gap end position.

The two pairs of second metal surfaces of the metal foil that make up the second IMIMI plasmonic waveguide 42 likewise have the cladding dielectric layer 43 and the core dielectric layer 43 so that the surface plasmon polariton in the symmetric or asymmetric mode can propagate 45) to form two pairs of second metal-dielectric interfaces.

When the coupling mode SPP, which is the symmetrical symmetry mode (Ss ₀ ) or symmetrical asymmetry mode (Sa ₀ ), reaches the gap start position of the gap 44, the electromagnetic wave of the coupling mode SPP causes the second IMIMI plasmonic waveguide 42 At the gap end position, the electromagnetic wave of the TM mode similar to the coupling mode SPP advancing the first IMIMI plasmonic waveguide 41 is excited.

Likewise, the similar particles SPP appear to reappear in the second IMIMI plasmonic waveguide 42, starting at the gap end position, across the gap 44, passing through the dielectric material filled in the gap 44 region.

The TM mode electromagnetic waves excited in the second IMIMI plasmonic waveguide 42 propagate along the two pairs of second metal-dielectric interfaces of the second IMIMI plasmonic waveguide 42.

Further, referring to FIG. 5, a plasmonic element having a discontinuous MIM waveguide in which a gap exists in a waveguide of a thick double metal plate (MIM) structure is exemplified.

The discontinuous MIM waveguide plasmonic element 50 includes a first MIM plasmon waveguide 51 composed of two adjacent metal plates having a width Wi and a first length di and starting from an input position, And a second MIM plasmon waveguide 52 made up of two adjacent flat metal strips of a second length do.

A pair of first metal surfaces facing each other of a pair of metal plates constituting the first MIM plasmonic waveguide 51 are arranged in a matrix form so that a surface plasmon polariton (SPP) in a symmetric mode or an asymmetric mode can propagate, 55) to form a pair of first metal-dielectric interfaces.

When the TM polarized photon is incident on the input position Xi of the first MIM plasmonic waveguide 51, the surface plasmon polariton is excited by the first MIM plasmon waveguide 51 and the core dielectric 51 in the gap symmetry mode (Gs ₀ ) Lt; RTI ID = 0.0 > 55 < / RTI >

The gap 54 starts from the gap start position at which the first MIM plasmonic waveguide 51 ending from the input position is made to have a length of the first length di and is spaced apart from the gap starting from the input end of the second MIM plasmonic waveguide 52 And is filled with dielectric by a gap length dc which is the distance between the gap start position and the gap end position.

Both the first MIM plasmonic waveguide 51 and the second MIM plasmonic waveguide 52 and the gap 54 may be surrounded by the clad dielectric layer 53.

A pair of opposing second metal surfaces of a pair of metal plates constituting the second MIM plasmonic waveguide 52 are also formed on the core dielectric layer (not shown) so that the surface plasmon polariton of the gap symmetry mode (Gs ₀ ) 55 to form a pair of second metal-dielectric interfaces.

When the coupling mode SPP having the gap symmetry mode Gs ₀ reaches the gap start position of the gap 54, the electromagnetic wave of the coupling mode SPP causes the first MIM 52 to be in the gap end position of the second MIM plasmon waveguide 52, The electromagnetic wave of the TM mode similar to the coupling mode SPP in which the plasmonic waveguide 51 travels is excited.

Similar to FIGS. 3 and 4, the SPP penetrates the dielectric material filled in the gap 54 region, skips the gap 54, and returns to the second MIM plasmonic waveguide 52 starting at the gap end position It looks like it appears.

The TM mode electromagnetic waves excited in the second MIM plasmonic waveguide 52 propagate along a pair of second metal-dielectric interfaces of the second MIM plasmonic waveguide 52.

The discontinuous plasmonic elements 30, 40, 50 of FIGS. 3-5 are more generally represented as follows.

First, the first plasmonic waveguides 31, 41 and 51 are formed with at least one pair of dielectric layers 33, 43, 45, 53 and 55 so that a surface plasmon polariton (SPP) Shaped metal material having at least a pair of first metal surfaces constituting the first metal-dielectric interfaces of the surface plasmon polar waveguide 31. The metal band constituting the first plasmon waveguide 31, 41, (For example, Wi) from the input position Xi of the surface plasmon polariton to the gap starting position along the progress direction of the riton.

Next, the second plasmonic waveguides 32, 42, and 52 are arranged so that the surface plasmon polaritons of the predetermined coupling mode can also propagate. The second plasmonic waveguides 32, 42, Shaped metal material having coplanar with first metal-dielectric interfaces and having at least a second pair of metal surfaces forming at least a pair of second metal-dielectric interfaces. The metal strips constituting the second plasmon waveguides 32, 42 and 52 extend from the gap end position spaced apart by the gap length dc in the traveling direction of the surface plasmon polariton from the gap start position to the surface plasmon polariton output position Xo And extends by a second length along the traveling direction of the surface plasmon polariton with a predetermined width (e.g., Wo).

At least one pair of first and second plasmonic waveguides 31, 32, 41, 42, 51, 52 at the first and second metal-dielectric interfaces. The dielectric layer 33, 43, 45, And a dielectric material capable of internally distributing the magnetic field of the surface plasmon polariton in the TM mode in the region from the gap start position to the gap end position in the region in contact with the first metal surfaces and the at least one pair of second metal surfaces .

The dielectric constant of the region where the dielectric layers 33, 43, 45, 55 contact the first and second metal surfaces and the dielectric constant of the gap region may be the same or different depending on the embodiment.

Figs. 6 to 8 are diagrams illustrating a case where, in a plasmonic element based on each of three structures of discontinuous waveguides, TE mode polarized control light is incident on a gap, according to an embodiment of the present invention, a surface plasmon polariton mode Which is an example of a phenomenon in which the transmission of a signal is interrupted.

6 to 8, a discontinuous plasmonic element 30 of a single metal thin film (IMI) structure, a discontinuous plasmonic element 40 of a double metal thin film (IMIMI) structure, and a discrete plasmatic element 40 of a thick double metal (MIM) The plasmonic element 50 has discontinuous waveguides 31, 32, 41, 42, 51, and 52 which are separated from each other by gaps 34, 44, and 54 in the center thereof.

In the discontinuous plasmonic devices 30, 40 and 50, light polarized in the TE mode in the y-axis direction, for example, perpendicularly to the x-axis direction, which is the traveling direction of the SPP mode, Is incident.

First, the polarization mode of the optical waveguide will be described. There are various modes in which light can proceed in the optical waveguide, that is, modes. However, when the light is reflected to the inner wall of the optical waveguide such as an optical cable and traveled for a long distance to some extent, the two fields of light, that is, the electric field and the magnetic field are horizontally Direction, and the modes in which the reflection path is an integer multiple of the half-wave length are largely attenuated while passing through many reflections on the inner wall of the optical waveguide, so that they can survive and become a dominant mode and the remaining modes are attenuated It disappears gradually.

Therefore, it can be said that the light emitted from the optical waveguide is output in one of the TE mode in which the electric field is perpendicular to the traveling direction or the TM mode in which the magnetic field is perpendicular to the traveling direction. From another point of view, it can be said that the optical signal must be incident on the optical waveguide in one of the TE mode or the TM mode and be transmitted with low loss far.

In each of Figs. 6 to 8, the TE mode polarized light enters the gap in a certain linear direction, for example, in the y-axis direction or the y-z plane so as to be orthogonal to the x-axis direction which is the traveling direction of the SPP mode.

Here, TE mode polarized light is incident perpendicularly to the x-axis direction, which means that the y-axis and z-axis components of the TE mode polarized light are relatively dominant relative to the x-axis component, and strictly x- It does not mean that it does not exist.

The TE mode polarized light penetrating through the gap vertically is the light formed in the x-axis direction across the gap. Therefore, the TE mode polarized light is affected by the electric field of the polarized light, And these charges can form strong dipoles. In other words, if charges accumulate along the metal longitudinal plane of the first plasmonic waveguide at the gap start position, such as + - + - + -, then along the metal longitudinal plane of the second plasmonic waveguide at the gap end position - + - + - And so on.

At this time, the fact that the electric field of the TE mode polarized light is formed parallel to the traveling direction (x-axis direction) of the SPP mode means that the x-axis component of the electric field of the TE mode polarized light is relatively higher than the y- Means dominant, and does not strictly mean a state in which the electric field exists only in the x-axis component.

As described above, surface plasmons, which are fundamental to the SPP mode, are collective oscillations of free charges in the metal. Collective oscillations of free charges, which are essential for the progression of the SPP mode, are caused by the strong charge induction phenomenon on the gap sidewalls by this TE mode polarized light It is interrupted by.

Thus, the SPP of a given coupling mode, which is the electromagnetic wave of the TM mode excited in the first plasmonic waveguides 31, 41, 51, is reflected by the dipoles excited by the TE mode polarized light in the gaps 34, The second plasmonic waveguides 32, 42, and 52 do not jump to the second plasmonic waveguides 32, 42, and 52, respectively.

In other words, when the TE mode polarized light is incident on the gaps 34, 44 and 54 to form an electric field parallel to the traveling direction of the SPP mode, the SPP mode does not pass through the gaps 34, 44 and 54, .

On the other hand, when the TE mode polarized light is stopped from entering the gaps 34, 44 and 54, the SPP mode again passes through the gaps 34, 44, and 54 and reaches the second plasmon waveguides 32, As shown in FIG.

This suggests the possibility of controlling the generation of the SPP mode by not entering or incurring TE mode polarized light perpendicular to the gaps 34, 44, 54.

This enables the implementation of a plasmonic logic element capable of generating a modulated SPP mode to have the desired information.

9 is a conceptual diagram illustrating a plasmonic logic device according to an embodiment of the present invention.

9, the plasmonic logic device 90 may include an input coupled plasmonic waveguide 91, an output plasmonic waveguide 92, a dielectric layer 93, and a TE mode control optical signal waveguide 94 have.

First, the input coupling plasmonic waveguide 91 is connected to one input surface plasmon polariton (SPP) signal of n predetermined coupling modes, one before each of the n metal strips excited at each input position reaches the gap start position A metal strip of a metal plate.

At this time, each metal band constituting the input coupled plasmon waveguide 91 is connected to the dielectric layer 93 such that each excited input SPP signal can propagate, , And may be embodied in a strip-shaped metal material having a predetermined width having at least a pair of first metal surfaces.

For example, if n = 2, where the number of input SPP signals is 2, the input coupled plasmon waveguide 91 may have a continuous "> " shape and a" - "

The output plasmonic waveguide 92 extends from the gap end position to the output position so that the output SPP signal of the predetermined coupling mode can propagate and forms the at least one pair of second metal- Shaped metal material having at least a pair of second metal surfaces.

At this time, the gap is formed from the gap start position to the gap end position spaced by the gap length in the traveling direction of the input SPP signals.

The dielectric layer 93 includes at least one pair of first metal surfaces and at least one pair of second metal-dielectric interfaces, at least one pair of input coupling plasmonic waveguides 91 and output plasmonic waveguides 92 at the first and second metal- Is implemented as a dielectric material capable of internally distributing the magnetic field of each of the TM mode SPP signals in the area tangential to the metal surfaces and in the area from the gap start position to the gap end position.

The dielectric constant of the region where the dielectric layer 93 contacts the first and second metal surfaces and the dielectric constant of the gap region may be the same or different depending on the embodiment.

The TE mode control optical signal waveguide 94 is designed to control the gap between the input coupling plasmon waveguide 91 and the output plasmon waveguide 92 according to the type of logic operation or the type of logic operation and the logical values of the input SPP signals The TE mode control optical signal polarized to form an electric field in the direction parallel to the traveling direction of the input SPP signals may be incident in a direction orthogonal to the traveling direction of the input SPP signals.

Whether or not the TE mode control optical signal is activated depending on the type of the logic operation can be determined according to the truth tables of Tables 1 to 5 below.

First, for the AND operation, the TE mode control optical signal can be activated (ON) or deactivated (OFF) according to each logic value of the input SPP signals, as shown in the truth table of Table 1. [

The first input SPP signal The second input SPP signal Control optical signal Output SPP signal 0 0 OFF 0 0 One ON (blocking) 0 One 0 ON (blocking) 0 One One OFF One

According to Table 1, the TE mode control optical signal is activated when the logical values of the input SPP signals are different from each other, that is, when they are "0" and "1" or when they are "1" and "0" OFF).

Thus, the output SPP signal is outputted as "1" only when the first and second input SPP signals are all "1", and is outputted as "0" otherwise, that is, (90) can be operated.

Next, for the OR operation, the TE mode control optical signal can be deactivated (OFF) regardless of the respective logic values of the input SPP signals, such as the truth table as shown in Table 2. [

The first input SPP signal The second input SPP signal Control optical signal Output SPP signal 0 0 OFF 0 0 One OFF One One 0 OFF One One One OFF One

According to Table 2, the TE mode control optical signal is inactivated (OFF) irrespective of the values of the logical values of the input SPP signals, so that when at least one of the first or second input SPP signals is "1 & The plasmonic logic element 90 can operate so that the signal is output as " 1 ", or when the signal is not "0"

Next, for the XOR operation, the TE mode control optical signal can be activated (ON) or deactivated (OFF) according to the respective logic values of the input SPP signals, as shown in the truth table in Table 3. [

The first input SPP signal The second input SPP signal Control optical signal Output SPP signal 0 0 OFF 0 0 One OFF One One 0 OFF One One One ON (blocking) 0

0 ", "0 ", and" 1 ", or " 1 "and" 1 ", respectively, when any one of the logical values of the input SPP signals is & The output SPP signal is output as "1" if the first and second input SPP signals are different from each other, and is output as "0 & The plasmonic logic element 90 may operate so that the XOR operation takes place.

Next, for the buffer operation, the TE mode control optical signal can be inactivated (OFF) regardless of the logic value of the input SPP signal, as shown in the truth table of Table 4. [

The first input SPP signal Control optical signal Output SPP signal 0 OFF 0 One OFF One

According to Table 4, the TE mode control optical signal is inactivated (OFF) regardless of the value of the logic value of the first input SPP signal, so that when the first input SPP signal is "1", the output SPP signal is "1" The PLMN 90 can be operated so that the PLMN 90 is outputted as "0", that is, the buffer operation occurs.

According to the embodiment, the TE mode control optical signal waveguide 94 may extend again in the same direction after the gap.

10 is a flowchart illustrating a logic operation method using a plasmonic logic device according to an embodiment of the present invention.

an output plasmon waveguide 92 disposed with a gap of a predetermined gap length therebetween is interposed between the input-coupled plasmon waveguide 91 which is a form in which n metal strips are combined into one metal band before reaching the gap start position With respect to the plasmonic logic element 90 involved, in step S101, each TM mode electromagnetic wave corresponding to the logical values of the respective input SPP signals at the n input locations of the input coupled plasmon waveguide 91 And generates input surface plasmon polariton (SPP) signals of n predetermined coupling modes.

In step S102, the TE mode polarized light is modulated to be activated or deactivated according to the type of the logical operation or according to the type of the logical operation and the logical values of the input SPP signals and also to form an electric field parallel to the traveling direction of the input SPP signals TE mode control optical signal to the gap.

Activation or deactivation of the TE mode control optical signal according to the type of logic operation can be defined by each of Tables 1 to 4 above.

For example, when the type of logical operation is an AND operation, the TE mode control optical signal is activated when the logical values of the input SPP signals are different from each other, and can be deactivated otherwise.

When the type of logic operation is an OR operation, the TE mode control optical signal can be deactivated irrespective of the values of the logical values of the input SPP signals.

When the type of logic operation is an XOR operation, the TE mode control optical signal is inactivated when any one of the logical values of the input SPP signals is "0 ", otherwise it can be activated.

When the type of logic operation is a buffer operation, the TE mode control optical signal can be deactivated.

In step S103, by exciting the output SPP signal to the output plasmon waveguide as the excited input SPP signals are passed or blocked in the gap by the modulated TE mode control optical signal incident on the gap, the logically calculated output SPP Signal can be output at the output position of the output plasmonic waveguide.

11 is a conceptual diagram illustrating a plasmonic logic device according to another embodiment of the present invention.

Referring to FIG. 11, the plasmonic logic device 110 may include an input coupled plasmonic waveguide 111, an output plasmonic waveguide 112, a dielectric layer 113, and a TE mode control optical signal waveguide 114 have.

First, the input coupled plasmonic waveguide 111 includes (n + 1) metal bands in which each of the input surface plasmon polariton (SPP) signals of n predetermined coupling modes and the control SPP signal are excited at respective input positions It can be embodied in a form of being combined into one metal band before reaching the gap start position.

At this time, each of the metal strips constituting the input-coupled plasmon waveguide 111 is divided into at least a pair of first metal- Shaped metal material having a predetermined width Wi having at least a pair of first metal surfaces constituting dielectric interfaces.

For example, when n = 2 where the number of input SPP signals is 2, the input coupled plasmon waveguide 111 may have a continuous shape of a "∋" shape and a "-" shape.

The output plasmonic waveguide 112 extends from the gap end position to the output position so that the output SPP signal of a predetermined coupling mode can propagate and forms an at least a pair of second metal- , And a band-shaped metal material having a predetermined width (W0) having at least a pair of second metal surfaces.

At this time, the gap is formed from the gap start position to the gap end position spaced by the gap length in the traveling direction of the input SPP signals.

The dielectric layer 113 includes at least a pair of first metal surfaces and at least a pair of second metal-dielectric interface layers, at least one pair of input coupling plasmonic waveguides 111 and output plasmonic waveguides 112 at first and second metal- Is implemented as a dielectric material capable of internally distributing the magnetic field of each of the TM mode SPP signals in the area tangential to the metal surfaces and in the area from the gap start position to the gap end position.

The dielectric constant of the region where the dielectric layer 113 contacts the first and second metal surfaces and the dielectric constant of the gap region may be the same or different depending on the embodiment.

The TE mode control optical signal waveguide 114 is designed to control the gap between the input coupling plasmon waveguide 111 and the output plasmon waveguide 112 according to the type of logic operation or the type of logic operation and the logical values of the input SPP signals The TE mode control optical signal polarized to form an electric field in the direction parallel to the traveling direction of the input SPP signals may be incident in a direction orthogonal to the traveling direction of the input SPP signals.

The logical value of the control SPP signal must be "1" if the input SPP signals are all "0 ", otherwise it may be" 0 &

Depending on the embodiment, the logical value of the control SPP signal may always be "1 ".

Whether or not the TE mode control optical signal is activated depending on the type of the logic operation can be determined according to the truth tables of Tables 5 to 8 below.

First, for the NOT operation, the TE mode control optical signal can be activated (ON) or deactivated (OFF) according to the logical value of the input SPP signal to be logically inverted, as shown in the truth table shown in Table 5. [

The first input SPP signal Control SPP signal Control optical signal Output SPP signal 0 One OFF One One 0 (1) ON (blocking) 0

According to Table 5, if the logic value of the input SPP signal to be inverted is "0", the logical value of the control SPP signal is "1" and the TE mode control optical signal is inactivated (OFF) 1 ", the logical value of the control SPP signal may be" 0 "or" 1 "(do not care), and the TE mode control optical signal is activated (ON).

Accordingly, when the first input SPP signal is "1", the output SPP signal is outputted as "0", and when the first input SPP signal is "0", the output SPP signal is outputted as "1" The plasmonic logic device 110 can operate so that the plasma display device 100 is activated.

Next, for the NAND operation, the logical value of the control SPP signal is determined according to each logical value of the input SPP signals and the TE mode control optical signal is activated (ON) or deactivated (OFF) .

First input
SPP signal Second input
SPP signal Control SPP signal Control optical signal Output SPP signal 0 0 One OFF One 0 One 0 (1) OFF One One 0 0 (1) OFF One One One 0 (1) ON (blocking) 0

According to Table 6, if the logical values of the first and second input SPP signals are both "0 ", the logical value of the control SPP signal is" 1 ", the TE mode control optical signal is deactivated (OFF) If the logical values of the input SPP signals are different from each other, that is, "0" and "1" or "1" and "0", the logic value of the control SPP signal may be "0" The logic value of the control SPP signal may be "0" or "1" if the logic values of the first and second input SPP signals are all "1 " The signal is activated (ON).

Accordingly, the output SPP signal is output as "0" only when both the first input SPP signal and the second input SPP signal are "1 ", and either the first input SPP signal or the second input SPP signal The output SPP signal is outputted as "1 " when all the bits are" 0 ", that is, "0 "," 0 ", "1 & The logic element 110 may operate.

Next, for the NOR operation, the logical value of the control SPP signal is determined according to the respective logic values of the input SPP signals and the TE mode control optical signal is activated (ON) or deactivated (OFF) .

First input
SPP signal Second input
SPP signal Control SPP signal Control optical signal Output SPP signal 0 0 One OFF One 0 One 0 (1) ON (blocking) 0 One 0 0 (1) ON (blocking) 0 One One 0 (1) ON (blocking) 0

According to Table 7, if the logical values of the first and second input SPP signals are all "0 ", the logical value of the control SPP signal is" 1 ", the TE mode control optical signal is deactivated (OFF) If the logical values of the input SPP signals are different from each other, that is, "0" and "1" or "1" and "0", the logic value of the control SPP signal may be "0" The control optical signal is activated and the logical value of the control SPP signal may be "0" or "1" if the logical values of the first and second input SPP signals are all " The signal is activated (ON).

Accordingly, only when the first input SPP signal or the second input SPP signal is "0 ", the output SPP signal is outputted as" 1 ", or if neither the first input SPP signal nor the second input SPP signal Quot; 1 ", that is, when the output SPP signal is outputted as "0 ", that is, the logical NOR operation is performed when all of" 1 ", "0 "," The logic element 110 may operate.

Next, for the XNOR operation, the logical value of the control SPP signal is determined according to each logical value of the input SPP signals, and the TE mode control optical signal is activated (ON) or deactivated (OFF) .

First input
SPP signal Second input
SPP signal Control SPP signal Control optical signal Output SPP signal 0 0 One OFF One 0 One 0 (1) ON (blocking) 0 One 0 0 (1) ON (blocking) 0 One One 0 (1) OFF One

According to Table 8, if the logical values of the first and second input SPP signals are both "0 ", the logic value of the control SPP signal is" 1 ", the TE mode control optical signal is deactivated If the logical values of the input SPP signals are different from each other, that is, "0" and "1" or "1" and "0", the logic value of the control SPP signal may be "0" The control optical signal is activated and the logical value of the control SPP signal may be "0" or "1" if the logical values of the first and second input SPP signals are all " The signal is deactivated (OFF).

Accordingly, when the first input SPP signal or the second input SPP signal are equal to each other, that is, when they are all "0" or all "1", the output SPP signal is outputted as "1" The output SPP signal is output as "0" when the two input SPP signals are different from each other, that is, "0 ", " 1 ≪ RTI ID = 0.0 > 110 < / RTI >

In Table 5 to Table 8, the logical value of the control SPP signal must be "1" if both the first input SPP signal and the second input SPP signal are "0 & "Can be obtained.

On the other hand, according to the embodiment, the TE mode control optical signal waveguide 114 can extend again in the same direction after the gap.

12 is a flowchart illustrating a logic operation method using a plasmonic logic device according to another embodiment of the present invention.

the output plasmon waveguide 112 (see Fig. 1) arranged with a gap of a predetermined gap length interposed between the input coupled plasmon waveguide 111, which is a form in which n + 1 metal strips are combined into one metal band before reaching the gap start position The input values of the n input SPP signals at the n input positions of the input coupled plasmon waveguide 111 and the logical values of one control SPP signal at step < RTI ID = 0.0 > S121 & Mode electromagnetic waves, respectively, to generate n input surface plasmon polariton (SPP) signals of n predetermined coupling modes.

At step S122, at one input position of the input coupled plasmon waveguide 111, the TM mode electromagnetic wave corresponding to the logic value of one control SPP signal, which is determined according to the logical values of the input SPP signals, is excited, Lt; / RTI > signals of a given coupling mode.

At step S123, the TE mode polarized TE mode control optical signal is modulated to be activated or deactivated according to the type of logic operation and the logic values of the input SPP signals and also to form an electric field parallel to the traveling direction of the input SPP signals, .

Activation or deactivation of the TE mode control optical signal according to the logic value of the control SPP signal and the type of logic operation determined according to the logic values of the input SPP signals can be defined by each of Tables 5 to 8 above.

The logical value of the control SPP signal must be "1" if the input SPP signals are all "0 ", otherwise it may be" 0 &

Depending on the embodiment, the logical value of the control SPP signal may always be "1 ".

For example, when the type of the logic operation is the NOT operation, the TE mode control optical signal is inactivated when the logical value of the input SPP signal is "0 ", and can be activated otherwise.

When the type of logic operation is a NAND operation, the TE mode control optical signal is activated only when the logical values of the input SPP signals are all "1 ", and otherwise can be deactivated.

When the type of logic operation is a NOR operation, the TE mode control optical signal is inactivated only when all the logical values of the input SPP signals are "0 ", otherwise it can be activated.

When the type of logical operation is an XNOR operation, the TE mode control optical signal is activated only when the logical values of the input SPP signals are equal to each other, and can be deactivated otherwise.

In step S124, by exciting the output SPP signal to the output plasmon waveguide as the excited input SPP signals and the control SPP signal are passed or blocked in the gap by the modulated TE mode control optical signal incident on the gap, The logically calculated output SPP signal can be output at the output position of the output plasmonic waveguide.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. It will be understood that variations and specific embodiments which may occur to those skilled in the art are included within the scope of the present invention.

30, 40, 50 Discontinuous Waveguide Plasmonics
31, 41, 51 A first plasmonic waveguide
32, 42, 52 A second plasmonic waveguide
33, 43, 45, 53, 55 dielectric layers
34, 44, 54 Gap
90, 110 Plasmonic logic element
91, 111 input coupling plasmonic waveguide
92, 112 Output Plasmonic Waveguide
93, 113 dielectric layer
94, 114 TE mode control optical signal waveguide

Claims (22)

an input coupled plasmonic waveguide (PPS) in which n metal strips excited at respective input positions of input surface plasmon polariton (SPP) signals of n predetermined coupling modes are integrated into one metal strip before reaching the gap start position, ;
An output plasmon waveguide implemented in the form of a metal band extending from the gap end position to the output position so that the output SPP signal of the predetermined coupling mode can propagate;
A dielectric layer in contact with respective metal surfaces of the input coupled plasmonic waveguide and the output plasmonic waveguide to form metal-dielectric interfaces; And
A TE mode control optical signal is input to a gap formed between the input coupling plasmon waveguide and the output plasmon waveguide from the gap start position to the gap end position in a direction orthogonal to a traveling direction of input SPP signals, A control optical signal waveguide,
Wherein the TE mode control optical signal is activated or deactivated according to the type of logic operation or according to the type of logic operation and the logic values of the input SPP signals and is polarized to form an electric field in a direction parallel to the traveling direction of the input SPP signals Wherein the first and second electrodes are electrically connected to each other. 4. The method of claim 1, wherein the type of logical operation is an AND operation,
The TE mode control optical signal is activated when the logical values of the input SPP signals are different from each other,
The output SPP signal is outputted as "1 " when all the input SPP signals are" 1 ", and otherwise, the output SPP signal is outputted as "0 ". The method of claim 1, wherein the type of the logic operation is an OR operation,
The TE mode control optical signal is inactivated regardless of the logic values of the input SPP signals, and when at least one of the input SPP signals is "1 ", the output SPP signal is output as" 1 & The output SPP signal is outputted as "0" when all of the output SPP signals are "0 ". 2. The method of claim 1, wherein the type of logical operation is an XOR operation,
The TE mode control optical signal is deactivated when any one of the logical values of the input SPP signals is "0 ", otherwise it is activated,
If the input SPP signals are different from each other, the output SPP signal is outputted as "1 ", and if the input SPP signals are equal to each other, the output SPP signal is outputted as" 0 ". The method of claim 1, wherein the type of logic operation is a buffer operation,
The TE mode control optical signal is inactivated regardless of the logic value of the input SPP signal, and when the input SPP signal is "1", the output SPP signal is output as "1" and the input SPP signal is "0" The output SPP signal is output as "0 ". A plasmonic logic calculation method using a plasmonic logic element,
Wherein the plasmonic logic device comprises:
and an output plasmon waveguide disposed with a gap of a predetermined gap length interposed therebetween with respect to the input coupled plasmon waveguide in which n metal strips are combined into one metal strip before reaching the gap start position,
The plasmonic logic operation method includes:
Each of the TM mode electromagnetic waves corresponding to logical values of respective input surface plasmon polariton (SPP) signals at n input positions of the input coupled plasmon waveguide is excited to generate n input SPP signals of a predetermined coupling mode ;
TE mode to be activated or deactivated according to the type of logic operation or according to the type of logic operation and the logic values of the input SPP signals and also to form an electric field parallel to the traveling direction of the input SPP signals TE mode Polarized TE mode control Introducing an optical signal into a gap; And
And outputting an output SPP signal excited by the output plasmon waveguide at an output position of the output plasmonic waveguide as the input SPP signals are passed or blocked by the gap by the TE mode control optical signal, A Plasmonic Logic Computation Method Using Monolithic Logic Devices. 7. The method of claim 6, wherein the type of logical operation is an AND operation,
The TE mode control optical signal is activated when the logical values of the input SPP signals are different from each other,
And the output SPP signal is outputted as " 1 "when the input SPP signals are all" 1 ", and otherwise the output SPP signal is outputted as "0 & Calculation method. 7. The method of claim 6, wherein the type of logical operation is an OR operation,
The TE mode control optical signal is inactivated regardless of the logic values of the input SPP signals, and when at least one of the input SPP signals is "1 ", the output SPP signal is output as" 1 & 0 ", the output SPP signal is output as "0 ". 7. The method of claim 6, wherein the type of logic operation is an XOR operation,
The TE mode control optical signal is deactivated when any one of the logical values of the input SPP signals is "0 ", otherwise it is activated,
The output SPP signal is output as "1" if the input SPP signals are different from each other, and the output SPP signal is output as "0 & Calculation method. 7. The method of claim 6, wherein the type of logic operation is a buffer operation,
The TE mode control optical signal is inactivated regardless of the logic value of the input SPP signal, and when the input SPP signal is "1", the output SPP signal is output as "1" and the input SPP signal is "0" The output SPP signal is output as "0 ". n metal strips in which input surface plasmon polariton (SPP) signals of n predetermined coupling modes are excited at respective input positions and one metal strip excited at one input port of the control SPP signal of one predetermined coupling mode An input coupled plasmonic waveguide implemented in a form of being integrated into one metal band before reaching the position;
An output plasmon waveguide implemented in the form of a metal band extending from the gap end position to the output position so that the output SPP signal of the predetermined coupling mode can propagate;
A dielectric layer in contact with respective metal surfaces of the input coupled plasmonic waveguide and the output plasmonic waveguide to form metal-dielectric interfaces; And
A TE mode control optical signal is input to a gap formed between the input coupling plasmon waveguide and the output plasmon waveguide from the gap start position to the gap end position in a direction orthogonal to a traveling direction of input SPP signals, A control optical signal waveguide,
The logical value of the control SPP signal is "1" when all of the input SPP signals are "0 &
The TE mode control optical signal is activated or deactivated according to the type of logic operation or according to the logic values of the input SPP signals or the type of logic operation and is polarized to form an electric field in a direction parallel to the traveling direction of the input SPP signals Wherein the plasma is a plasma. 12. The method of claim 11, wherein the type of the logical operation is a NOT operation,
The TE mode control optical signal is deactivated if the logical value of the input SPP signal is "0 ", otherwise it is activated,
The output SPP signal is output as "0" when the input SPP signal is "1" and the output SPP signal is "1" when the input SPP signal is "0" . 12. The method of claim 11, wherein the type of logical operation is a NAND operation,
The TE mode control optical signal is inactivated if the logical values of the input SPP signals are both "0" or different from each other, and are activated when the logical values of the input SPP signals are all "1 &
When the input SPP signals are all "1 ", the output SPP signal is output as" 0 "; otherwise, the output SPP signal is outputted as "1 ". 12. The method of claim 11, wherein the type of logical operation is a NOR operation,
The TE mode control optical signal is deactivated if the logical values of the input SPP signals are all "0 ", otherwise,
The output SPP signal is outputted as "1" only when all of the input SPP signals are "0", and otherwise the output SPP signal is outputted as "0". 12. The method of claim 11, wherein the type of logical operation is an XNOR operation,
The TE mode control optical signal is inactivated when the logical values of the input SPP signals are both "0" or all "1 ", and are activated when the logical values of the input SPP signals are different from each other,
The output SPP signal is output as "1" if the logical values of the input SPP signals are all the same, and otherwise the output SPP signal is output as "0". 12. The plasmonic logic device according to claim 11, wherein the logic value of the control SPP signal is always "1 ". A plasmonic logic calculation method using a plasmonic logic element,
Wherein the plasmonic logic device comprises:
and an output plasmon waveguide disposed with a gap of a predetermined gap length interposed therebetween with respect to the input coupled plasmon waveguide, which is a form in which n + 1 metal strips are combined into one metal band before reaching the gap start position,
The plasmonic logic operation method includes:
Each of the TM mode electromagnetic waves corresponding to the logical values of respective input surface plasmon polariton (SPP) signals at n input locations of the input coupled plasmon waveguide is excited, and input SPP signals of n predetermined coupling modes ;
Exciting a TM mode electromagnetic wave corresponding to a logic value of control SPP signals at one input position of the input coupled plasmon waveguide to generate a control SPP signal of one predetermined coupling mode;
TE mode to be activated or deactivated according to the type of logic operation or according to the type of logic operation and the logic values of the input SPP signals and also to form an electric field parallel to the traveling direction of the input SPP signals TE mode Polarized TE mode control Introducing an optical signal into a gap; And
And an output SPP signal excited by the output plasmon waveguide is output at an output position of the output plasmon waveguide as the input SPP signals and the control SPP signal are passed or blocked by the gap by the TE mode control optical signal The method comprising the steps of: 18. The method of claim 17, wherein the type of logical operation is a NOT operation,
The TE mode control optical signal is deactivated if the logical value of the input SPP signal is "0 ", otherwise it is activated,
The output SPP signal is output as "0" when the input SPP signal is "1" and the output SPP signal is "1" when the input SPP signal is "0" Plasmonic Logic Computation Method Using. 18. The method of claim 17, wherein the type of logic operation is a NAND operation,
The TE mode control optical signal is inactivated if the logical values of the input SPP signals are both "0" or different from each other, and are activated when the logical values of the input SPP signals are all "1 &
Wherein when the input SPP signals are all "1 ", the output SPP signal is output as" 0 "; otherwise, the output SPP signal is outputted as "1 " Way. 18. The method of claim 17, wherein the type of logical operation is a NOR operation,
The TE mode control optical signal is deactivated if the logical values of the input SPP signals are all "0 ", otherwise,
The output SPP signal is outputted as "1" only when all of the input SPP signals are "0", and otherwise, the output SPP signal is outputted as "0" Logical operation method. 18. The method of claim 17, wherein the type of logical operation is an XNOR operation,
The TE mode control optical signal is inactivated when the logical values of the input SPP signals are both "0" or all "1 ", and are activated when the logical values of the input SPP signals are different from each other,
And the output SPP signal is outputted as " 1 "if the logical values of the input SPP signals are all the same, and otherwise the output SPP signal is outputted as" 0 & . 18. The method of claim 17, wherein the logical value of the control SPP signal is always "1 ".

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