CN114114783A - Three-dimensional space all-optical multi-logic function device and all-optical multi-logic operation method - Google Patents
Three-dimensional space all-optical multi-logic function device and all-optical multi-logic operation method Download PDFInfo
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Abstract
The invention discloses a three-dimensional all-optical multi-logic function device and an all-optical multi-logic operation method, wherein the device comprises a first optical input device, a second optical input device, an optical output device and a logic operation device, wherein the logic operation device comprises a plurality of all-optical logic function films which are respectively arranged along three different directions, each direction comprises at least two parallel opposite all-optical logic function films so as to form an optical logic gate in the corresponding direction, and the transmissivity of each all-optical logic function film changes along with the input change of control light; the first optical input device is used for respectively transmitting control light incident along different directions to different all-optical logic function films, and the second optical input device is used for enabling input light to vertically penetrate through the parallel opposite all-optical logic function films in any direction and outputting the control light from the optical output device to obtain output light. By the aid of the three-dimensional space all-optical multi-logic function device, optical operation in multiple directions in the three-dimensional space can be achieved.
Description
Technical Field
The invention belongs to the technical field of optical communication, and particularly relates to a three-dimensional space all-optical multi-logic functional device and an all-optical multi-logic operation method.
Background
The communication system of modern society is mainly optical fiber communication. With the continuous development of the internet and the emergence of new technologies such as the internet of things, people put higher demands on the transmission rate and capacity of optical fiber communication. In contrast, in the conventional optical fiber communication system, there are many nodes including many optical interconnection devices, and these devices have a large number of optical-to-electrical-to-optical conversion processes, and due to the existence of the electronic bottleneck, these nodes actually limit the transmission rate of the optical fiber communication, and the communication capacity in the optical fiber is not fully utilized. Therefore, researchers have proposed the concept of all-optical communication, that is, light is used to control light, and such a system does not have the photoelectric conversion process, thereby avoiding the limitation caused by the electronic bottleneck.
An all-optical logic gate is one of the key devices in an all-optical network. At present, all-optical logic gates widely used in optical communication networks generally perform optical logic operation according to light reflection and mutual interference, have a complex structure, can only realize optical logic operation in two-dimensional directions, are difficult to build a three-dimensional space structure, and can realize simultaneous operation of light in multiple dimensions.
Disclosure of Invention
In view of the above defects or improvement requirements of the prior art, the present invention provides a three-dimensional space all-optical multi-logic functional device and an all-optical multi-logic operation method, and aims to implement multi-logic optical operation in a three-dimensional space.
To achieve the above object, according to one aspect of the present invention, there is provided a three-dimensional all-optical multi-logic function device, comprising a first optical input means, a second optical input means, an optical output means, and a logic operation means, wherein,
the logic operation device comprises a plurality of all-optical logic functional films which are respectively arranged along three different directions, each direction comprises at least two parallel and opposite all-optical logic functional films to form an optical logic gate in the corresponding direction, and the transmissivity of each all-optical logic functional film changes along with the input change of control light;
the first optical input device is used for respectively transmitting the control light incident along different directions to different all-optical logic function films,
the second optical input device is used for enabling input light to vertically penetrate through the parallel and opposite all-optical logic function thin films in any direction and outputting the input light from the optical output device to obtain output light.
Preferably, the optical detection device is further included, and is configured to detect the output light and obtain an optical logical operation result of the corresponding control light according to a light intensity ratio of the output light to the input light.
Preferably, the all-optical logic function film comprises a substrate, a silicon photonic crystal, an isolation layer film, a chalcogenide phase change material and a cover layer film which are stacked in sequence, wherein the silicon photonic crystal is provided with a nanopore array, and the crystal structure of the chalcogenide phase change material changes along with the change of the input of control light.
Preferably, the control light that causes the all-optical logic function film to be in the amorphous state represents an input "1", and the control light that causes the all-optical logic function film to be in the crystalline state represents an output "0", wherein,
when the optical logic gate is an NOT gate or a NOR gate, the all-optical logic function film in the corresponding optical logic gate enhances the Fano resonance in an amorphous state and inhibits the Fano resonance in a crystalline state;
when the optical logic gate is an OR gate or an AND gate, the all-optical logic functional film in the corresponding optical logic gate does not generate Fano resonance in an amorphous state or a crystalline state.
Preferably, the different optical logic gates have the same determination value, and the transmittance of the all-optical logic functional film when performing the logic operation is such that the light intensity ratio of the output light to the input light is lower than the determination value when the optical logic operation result is "0" and higher than the determination value when the optical logic operation result is "1".
Preferably, the same all-optical logic functional film has nanopore arrays with different sizes and intervals, different nanopore arrays have different transmission spectra, different nanopore arrays in the same all-optical logic functional film form different functional areas, and a group of functional areas opposite to each other in the same direction form an optical logic gate.
Preferably, the three-dimensional space all-optical multi-logic functional device further comprises a displacement control device, and the displacement control device is used for controlling the movement of the all-optical logic functional film so that the input light and the control light act on a specific nanopore array in the all-optical logic functional film.
Preferably, each direction has two parallel opposite all-optical logic functional films, and the two all-optical logic functional films in each direction are respectively located at two sides of the same reference point.
According to another aspect of the present invention, there is provided a method for all-optical multiple logic operation in a three-dimensional space, including:
building a logic operation device, wherein the logic operation device comprises a plurality of all-optical logic functional films which are respectively arranged along three different directions, each direction comprises at least two parallel and opposite all-optical logic functional films to form an optical logic gate in the corresponding direction, and the transmissivity of each all-optical logic functional film changes along with the input change of control light;
selecting a target optical logic gate, and respectively injecting different control lights to different all-optical logic function films in the target optical logic gate to change the transmissivity of the all-optical logic function films;
the input light vertically penetrates through all-optical logic function films in the target optical logic gate to form output light;
and detecting output light, calculating the light intensity ratio of the output light to the input light, and determining the optical logic operation result corresponding to the control light according to the light intensity ratio.
Preferably, the all-optical logic function film includes a substrate, a silicon photonic crystal, an isolation layer film, a chalcogenide phase change material, and a capping layer film, which are stacked in sequence, where the silicon photonic crystal has a nanopore array, and a crystal structure of the chalcogenide phase change material changes with a change of the control light, and the method further includes:
adjusting the aperture and the distance of the nano holes to enable the all-optical logic function film in the optical logic not gate or the optical logic nor gate to enhance Fano resonance in an amorphous state and inhibit the Fano resonance in a crystalline state, so that the all-optical logic function film in the optical logic or gate or the optical logic and gate does not generate the Fano resonance in the amorphous state and the crystalline state;
the control light which makes the all-optical logic function film in an amorphous state represents '1', the control light which makes the all-optical logic function film in a crystalline state represents '0', the optical logic operation result is represented as '0' by the light intensity ratio being smaller than the judgment value, and the optical logic operation result is represented as '1' by the light intensity ratio being larger than the judgment value.
In general, a logic operation device of the three-dimensional space all-optical multi-logic function device built in the present application includes a plurality of all-optical logic function films arranged in three different directions, and each direction includes at least two parallel and opposite all-optical logic function films to form an optical logic gate in a corresponding direction, that is, an optical logic gate is formed in each direction, so that optical operations in multiple directions in a three-dimensional space can be realized. The transmittance of the all-optical logic function film is changed along with the change of the control light, the incident control light is different, the transmittance of the corresponding all-optical logic function film is different, the control light is changed into '0' and '1' through different transmittances, after the transmittance of the all-optical logic function film is regulated and controlled through the control light, the input light penetrates through all-optical logic function films in the optical logic gate, the transmittance of the output light is calculated, and then the optical logic operation result of the control light can be obtained.
Drawings
Fig. 1 is a schematic structural diagram of a three-dimensional space all-optical multi-logic functional device in an embodiment of the present application;
FIG. 2 is a schematic diagram of a logic operation device according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of an all-optical logic functional thin film in an embodiment of the present application;
FIG. 4 is a top view of a nanopore array structure on a silicon photonic crystal of an optical logic OR gate in an embodiment of the present application;
FIG. 5 is a top view of a nanopore array structure on a silicon photonic crystal of an optical logic NOR gate in an embodiment of the present application;
FIG. 6 is a top view of a nanopore array structure on a silicon photonic crystal of an optical logic AND gate in an embodiment of the present application;
FIG. 7 is a spectrum of an operational output of an optical logic OR gate in an embodiment of the present application;
FIG. 8 is a spectrum of an operational output of an optical logic NOR gate in an embodiment of the present application;
FIG. 9 is a spectrum of an output of an optical logic AND gate in an embodiment of the present application;
fig. 10 is an operation output spectrum of the optical logic not gate in an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Fig. 1 is a schematic structural diagram of a three-dimensional space all-optical multi-logic function device in an embodiment of the present application, where the schematic structural diagram is a two-dimensional plan view in one direction, and mainly includes a first optical input device 1, a second optical input device 2, an optical output device 4, and a logic operation device 5.
Referring to fig. 2 again, the logical operation device 5 is a schematic structural diagram of the logical operation device 5, where the logical operation device 5 includes a plurality of all-optical logic functional films 50 respectively arranged in three different directions, each direction includes at least two parallel and opposite all-optical logic functional films, the all-optical logic functional films in each direction are parallel and opposite to form an optical logic gate in the direction, and the transmittance of each all-optical logic functional film changes with the change of the control light.
The following description will be given taking three directions as an X-axis direction, a Y-axis direction, and a Z-axis direction in the drawings, respectively, as an example.
Two pieces of all-optical logic functional films 50 arranged in parallel and oppositely in the X-axis direction form an optical logic gate in the X-axis direction, the first optical input device 1 respectively transmits the control light 113 and the control light 114 to different all-optical logic functional films 50 in the X-axis direction, the received control light is different, the transmittances of the all-optical logic functional films are different, at this time, the second optical input device 2 makes the input light 111 vertically incident and sequentially pass through the all-optical logic functional films 50 in the X-axis direction to obtain the output light 112, the all-optical logic functional films 50 show different transmittances under the action of the control light, and the light intensity of the output light 112 is weakened after the input light 111 passes through the all-optical logic functional films 50, so that the optical logic operation result corresponding to the control light 113 and the control light 114 can be obtained according to the light intensity ratio of the output light 112 to the input light 111.
Similarly, two pieces of all-optical logic function films 50 arranged in parallel and opposite to each other in the Y-axis direction form an optical logic gate in the Y-axis direction, the first optical input device 1 transmits the control light 123 and the control light 124 to different all-optical logic function films 50 in the Y-axis direction, the received control light is different, and the transmittances of the all-optical logic function films are different, at this time, the second optical input device 2 makes the input light 121 vertically incident and sequentially pass through the all-optical logic function films 50 in the Y-axis direction to obtain the output light 122, because the all-optical logic function films 50 exhibit different transmittances under the action of the control light, the light intensity of the output light 122 is weakened after the input light 121 passes through the all-optical logic function films 50, and therefore, the optical logic operation result corresponding to the control light 123 and the control light 124 can be obtained according to the light intensity ratio of the output light 122 and the input light 121.
Similarly, two pieces of all-optical logic function films 50 arranged in parallel and opposite to each other in the Z-axis direction form an optical logic gate in the Z-axis direction, the first optical input device 1 transmits the control light 133 and the control light 134 to different all-optical logic function films 50 in the Z-axis direction, the received control light is different, and the transmittances of the all-optical logic function films are different, at this time, the second optical input device 2 makes the input light 131 vertically incident and sequentially pass through the all-optical logic function films 50 in the Z-axis direction to obtain the output light 132, because the all-optical logic function films 50 exhibit different transmittances under the action of the control light, after the input light 131 passes through the all-optical logic function films 50, the light intensity of the output light 132 is weakened, and therefore, the optical logic operation result corresponding to the control light 133 and the control light 134 can be obtained according to the light intensity ratio of the output light 132 and the input light 131.
The three-dimensional space all-optical multi-logic function device can simultaneously realize logic operation in multiple directions in a three-dimensional space, and can also independently start any one optical logic gate to realize optical logic operation in a two-dimensional space. Because the input light propagation directions of the optical logic gates in the multiple directions are different, mutual interference can not be caused when the optical logic gates in the multiple directions are enabled simultaneously.
It should be noted that three directions are not necessarily perpendicular to each other, the position relationship may be flexibly set as required, and optical logic gates in three directions may not only be set, but also may be in more directions, and the number of optical logic gates is not limited.
In an embodiment, with reference to fig. 2, each direction has two parallel opposite all-optical logic functional films, and the two all-optical logic functional films in each direction are located on two sides of the same reference point, respectively, that is, all-optical logic functional films move toward the reference point and then are combined into a box structure.
In one embodiment, as shown in fig. 1, the three-dimensional space all-optical multi-logic function device further includes a focusing lens 4, and the focusing lens 4 is used for performing focusing processing on the input light and the control light so as to enable the optical fiber to be incident to a specific position of the all-optical logic function film.
In one embodiment, as shown in fig. 3, the all-optical logic function film 50 includes a capping layer film 550, a chalcogenide phase change material film 540, an isolation layer film 530, a silicon photonic crystal 520 and a substrate 510 stacked in sequence. The silicon photonic crystal 520 includes an array of nanopores 560.
The chalcogenide phase change material film 540 has a phase change characteristic, and can perform reversible phase change under the action of laser with different intensities, repetition frequencies and pulse widths. When the control light is incident on the chalcogenide phase change material thin film, the crystal structure of the chalcogenide phase change material thin film can be changed, thereby changing the transmittance of the all-optical logic function thin film 50. The phase change mechanism of the chalcogenide phase change material can be phase change of the chalcogenide phase change material caused by photo-thermal effect, or lattice damage of the chalcogenide phase change material caused by optical pulse, or chalcogenide phase change caused by pulseImpact ionization inside the material. The crystalline state and the amorphous state of the chalcogenide phase change material are nonvolatile, namely the state of the chalcogenide phase change material is kept without external continuous input, and the chalcogenide phase change material can be kept for a long time once switched, so that the chalcogenide phase change material is triggered to generate phase change only by using control light, and the control light is not required to be continuously input in the whole logic operation period. In one embodiment, Ge is used2Sb2Te5The chalcogenide phase change material which can be crystallized and amorphized and has reversible phase change is not used as any limitation to the scope of the present invention, and all chalcogenide phase change materials which can be crystallized and amorphized and have reversible phase change are included in the scope of the phase change material film used in the present invention.
In one embodiment, the radius of the nanopores in the nanopore array 560 is 70nm to 370nm, the center-to-center spacing between adjacent nanopores is 700nm to 5100nm, and the depth of the nanopores is 150nm to 250 nm. The thickness of the chalcogenide phase change material film 540 is 5nm to 25 nm. The thickness of the isolation layer film 530 is 15nm-40nm, and the isolation layer film 530 is SiO2Film or SiNxA film. The capping layer film 550 has a thickness of 20nm to 200nm and is ZnS/SiO2Film, SiO2Film or SiNxA film.
In an embodiment, the chalcogenide phase change material film 540 in the same all-optical logic functional film 50 may include a plurality of nanopore arrays, where the pore diameters and the pore distances of the nanopores in different nanopore arrays are different, and the transmission spectra of different nanopore arrays in the same all-optical logic functional film are different, and each nanopore array serves as a functional region. Therefore, the same all-optical logic functional film may also include a plurality of functional regions, and the functional regions facing in the same direction form one optical logic gate, that is, a plurality of optical logic gates may be formed in the same direction. Therefore, the three-dimensional space all-optical multi-logic function device in the application can realize logic simultaneous operation in the same direction besides multi-direction logic simultaneous operation.
In an embodiment, as shown in fig. 1, the three-dimensional space all-optical multi-logic function device further includes a displacement control device 6, where the displacement control device 6 is configured to control the all-optical logic function film 50 to move so that the input light acts on a specific nanopore array in the all-optical logic function film 50 to implement a specific optical logic gate operation.
Furthermore, the structure of the nanopore array in the all-optical logic functional film needs to be set according to the operation of a specific optical logic gate, and the characteristics of the nanopore array, such as the aperture, the pitch, the depth and the like, need to be adjusted. In one embodiment, when a logic operation is specifically executed, the control light that causes the all-optical logic function film to be in the amorphous state may represent an input "1", and the control light that causes the all-optical logic function film to be in the crystalline state may represent an output "0", where the arrangement of the nano holes may be different for different optical logic gates. The applicant finds that, although the all-optical logic functional thin film may generate the fano resonance when the parameters of the nanopore array satisfy certain conditions, not all optical logic gates need to induce the fano resonance, and some optical logic gates need to avoid the fano resonance, which is specifically as follows:
when the optical logic gate is an nor gate or a nor gate, the nanopore array in the all-optical logic functional film in the corresponding optical logic gate needs to satisfy the following requirements: the Fano resonance is enhanced in the amorphous state and suppressed in the crystalline state, that is, the Fano resonance intensity of the all-optical logic functional thin film in the amorphous state is greater than that in the crystalline state, thereby improving the discrimination of the optical logic gate output results to be "1" and "0".
When the optical logic gate is an OR gate or an AND gate, the all-optical logic functional film in the corresponding optical logic gate can avoid the occurrence of Fano resonance in the amorphous state and the crystalline state.
In one embodiment, the result of the optical logical operation represented by the output light may be determined by the same criteria. Specifically, different optical logic gates set the same decision value, and parameters of all-optical logic functional films in different logic gates are adjusted to meet the following requirements: when the logic operation is executed, the transmissivity of the all-optical logic function film is such that the light intensity ratio of the output light to the input light is lower than a determination value when the optical logic operation result is '0', and the light intensity ratio of the output light to the input light is higher than the determination value when the optical logic operation result is '1'. In this case, when a logical operation is performed for different logical gates, the logical operation result can be determined by comparing the light intensity ratio of the output light to the input light with the same determination value, and when the light intensity ratio is lower than the determination value, the output is regarded as "0", and when the light intensity ratio is higher than the determination value, the output is regarded as "1".
Hereinafter, a specific optical logic gate will be described.
Example 1 an optical logic gate is an or gate
As shown in fig. 4, which is a top view of a nanopore array structure 520 on a silicon photonic crystal, a radius of a nanopore 561 on the silicon photonic crystal 520 is 130nm to 150nm, specifically 140nm, a hole center distance is 890nm to 910nm, specifically 900nm, a hole depth is 200nm to 220nm, specifically 210 nm; depositing a layer of 25nm thick SiO over the silicon photonic crystal 5202An isolation layer 530; depositing a 15nm chalcogenide phase change material GST film 540 on the isolation layer film 530; depositing a 100nm covering layer SiO with oxidation resistance on the chalcogenide phase-change material film 5402The film 550 is formed by cascading two corresponding all-optical logic functional films in parallel to obtain an all-optical logic device or gate region with a working wavelength of 1550 nm.
As shown in fig. 7, the operational output spectrum of the optical logic or gate is obtained by setting the specific parameter control laser for modulating the state of the phase change material film to an amorphous state as an input "1", setting the specific parameter control laser for modulating the state of the phase change material film to a crystalline state as an input "0", and adjusting the transmittances of the all-optical logic functional films with the inputs "1" and "0" so that the transmittance of the output light is lower than a determination value when the output result is "0", and the transmittance of the output light is higher than the determination value when the output result is "1", and therefore, when the logical operation is performed, it is possible to determine whether the current logical operation result is "0" or "1" according to the transmittance of the output light, which is the light intensity ratio of the output light to the input light. In this embodiment, the determination value is set to 32%, and when the transmittance of output light is lower than 32%, the output logic is set to 0, otherwise, it is set to 1. Taking the formation of an or gate in the X-axis direction as an example, the all-optical or logical operation relationship is shown in table 1 below, wherein the transmittance is the light intensity ratio of the output light 112 to the input light 111.
TABLE 1 OR gate logic relationship Table
| Control light 113 | Control light 114 | |
Transmittance of light |
| 0 | 0 | 0 | 0.306 |
| 1 | 0 | 1 | 0.51 |
| 0 | 1 | 1 | 0.51 |
| 1 | 1 | 1 | 0.849 |
Example 2 an optical logic gate is a nor gate
FIG. 5 is a top view of a nanopore array structure 520 on a silicon photonic crystalThe radius of the nano holes 562 on the silicon photonic crystal 520 is 65nm to 85nm, specifically 75nm, the inter-hole distance is 800nm to 820nm, specifically 810nm, the hole depth is 200nm to 220nm, specifically 210 nm; depositing a layer of 25nm thick SiO over the silicon photonic crystal 5202An isolation layer 530; depositing a 15nm chalcogenide phase change material GST film 540 on the isolation layer film 530; depositing a 100nm covering layer ZnS/SiO with oxidation resistance on the chalcogenide phase-change material film 5402And (3) a thin film 550, resulting in one of the switch cells of the all-optical logic device. Two switch units are parallelly cascaded in the direction vertical to the transmission direction of the transmission signal light to obtain the NOR gate area of the all-optical logic device with the working wavelength at 1550 nm.
As shown in fig. 8, the operational output spectrum of the optical logic nor gate is obtained by setting the specific parameter control laser for modulating the state of the phase change material film to an amorphous state as an input "1", setting the specific parameter control laser for modulating the state of the phase change material film to a crystalline state as an input "0", and adjusting the transmittances of the all-optical logic functional films having the inputs "1" and "0" so that the transmittance of the output light is lower than a determination value when the output result is "0", and the transmittance of the output light is higher than the determination value when the output result is "1", and therefore, when the logical operation is performed, it is possible to determine whether the current logical operation result is "0" or "1" according to the transmittance of the output light, which is the light intensity ratio of the output light to the input light. In this embodiment, the determination value is set to 32%, and when the transmittance of output light is lower than 32%, the output logic is set to 0, otherwise, it is set to 1. Taking the example of forming a nor gate in the X-axis direction, the relationship of the all-optical nor logic operation is shown in table 2 below, wherein the transmittance is the light intensity ratio of the output light 112 to the input light 111.
TABLE 2 NOR gate logic relationship Table
| Control light 113 | Control light 114 | |
Transmittance of light |
| 0 | 0 | 1 | 0.342 |
| 1 | 0 | 0 | 0.065 |
| 0 | 1 | 0 | 0.065 |
| 1 | 1 | 0 | 0.012 |
Example 3 an optical logic gate is an AND gate
As shown in fig. 6, which is a top view of a nanopore array structure 520 on a silicon photonic crystal, the radius of the nanopore 563 on the silicon photonic crystal 520 is 360nm to 380nm, specifically 370nm, the inter-pore distance is 990nm to 1100nm, specifically 1000nm, the pore depth is 200nm to 220nm, specifically 210 nm; depositing a layer of 25nm thick SiO over the silicon photonic crystal 5202An isolation layer 530; depositing a 15nm chalcogenide phase change material GST film 540 on the isolation layer film 530; depositing a 100nm layer of anti-blocking material on the chalcogenide phase change material film 540Oxidizing SiO coating2And (3) a thin film 550, resulting in one of the switch cells of the all-optical logic device. Two switch units are parallelly cascaded in the direction perpendicular to the transmission direction of the transmission signal light to obtain an all-optical logic device and gate area with the working wavelength at 1550 nm.
As shown in fig. 9, in the calculation output spectrum of the optical logic and gate, the specific parameter control laser for modulating the state of the phase change material film to be amorphous is input "1", the specific parameter control laser for modulating the state of the phase change material film to be crystalline is input "0", and the transmittances of the all-optical logic function film having the inputs "1" and "0" are adjusted so that when the output result is "0", the transmittance of the output light is lower than the determination value, and when the output result is "1", the transmittance of the output light is higher than the determination value, and therefore, when the logical calculation is performed, it is possible to determine whether the current logical calculation result is "0" or "1" based on the transmittance of the output light, which is the light intensity ratio of the output light to the input light. In this embodiment, the determination value is set to 32%, and when the transmittance of output light is lower than 32%, the output logic is set to 0, otherwise, it is set to 1. Taking the example of forming an and gate in the X-axis direction, the relationship between total light and logic operation is shown in table 3 below, wherein the transmittance is the light intensity ratio of the output light 112 and the input light 111.
TABLE 3 AND gate logical relationship Table
| Control light 113 | Control light 114 | |
Transmittance of light |
| 0 | 0 | 0 | 0.018 |
| 1 | 0 | 0 | 0.116 |
| 0 | 1 | 0 | 0.116 |
| 1 | 1 | 1 | 0.742 |
Example 4 the optical logic gate is a not gate
Because the not-gate realizes the operation of single control light, and the logic gate is a cascade structure of a plurality of all-optical logic function films, when the not-gate logic is realized, one all-optical logic function film in the cascade structure can be used as an actual operation unit to transmit the control light to the all-optical logic function film, the rest all-optical logic function films can increase the light transmittance as much as possible and reduce the influence on input light, for example, the rest all-optical logic function films in the not-logic gate are amorphous films and have no nanopore array structure, the all-optical logic function film used as the actual operation unit is used as a regulation object, a specific parameter control laser for modulating the state of a phase change material film into an amorphous state is used as an input '1', a specific parameter control laser for modulating the state of the phase change material film into a crystalline state is used as an input '0', and the transmittance of the all-optical logic function films with the input of '1' and the input of '0' is regulated, when the output result is "0", the transmittance of the output light is lower than the determination value, and when the output result is "1", the transmittance of the output light is higher than the determination value, so that when the logical operation is performed, it is possible to determine whether the current logical operation result is "0" or "1" based on the transmittance of the output light, which is the light intensity ratio of the output light to the input light. In this embodiment, the determination value is 32%, and as shown in fig. 10, the operation output spectrum of the optical not gate is shown, and when the transmittance of the output light is lower than 32%, the output logic is determined to be 0, otherwise, the output logic is 1. Taking the example of forming a not gate in the X-axis direction, the control light 113 is subjected to a not gate operation, and the relationship of the total light non-logical operation is shown in table 4 below, where the transmittance is the light intensity ratio of the output light 112 to the input light 111.
TABLE 4 NOT-DOOR LOGIC RELATIONS TABLE
| Control light 113 | |
Transmittance of light |
| 0 | 1 | 0.585 |
| 1 | 0 | 0.111 |
In addition, by combining a plurality of and gates, or gates, nor gates, other elements with logic relationship can be implemented, such as or gates, exclusive or gates, nand gates, etc., and, or, nor gates can be easily implemented by those skilled in the art according to the prior art.
Based on the three-dimensional space all-optical multi-logic function device, the application also protects an all-optical multi-logic operation method in the three-dimensional space, which comprises the following steps:
step S1: and constructing a logic operation device, wherein the logic operation device comprises a plurality of all-optical logic functional films which are respectively arranged along three different directions, each direction comprises at least two parallel and opposite all-optical logic functional films to form an optical logic gate in the corresponding direction, and the transmissivity of each all-optical logic functional film changes along with the input change of control light.
Specifically, the structure of the logic operation device is described above, and is not described herein again.
Step S2: and selecting a target optical logic gate, respectively injecting different control lights onto different all-optical logic function films in the target optical logic gate to change the transmissivity of the all-optical logic function films, and vertically passing the input lights through all the all-optical logic function films in the target optical logic gate to form output lights.
Specifically, one or more target logic gates are selected. For example, referring to fig. 2, logic gates in the X-axis, Y-axis, and Z-axis directions are all selected as target logic gates. For the X-axis logic gate, the control light 113 and the control light 114 are respectively transmitted to different all-optical logic functional films 50 in the X-axis direction, and at this time, the input light 111 is vertically incident and sequentially passes through the respective all-optical logic functional films 50 in the X-axis direction, so as to obtain the output light 112. Similarly, output light 122 in the Y-axis and output light 132 in the Z-axis are obtained.
Step S3: and detecting output light, calculating the light intensity ratio of the output light to the input light, and determining the optical logic operation result corresponding to the control light according to the light intensity ratio.
Since the control light received by the all-optical logic function film is different and the transmittance of the all-optical logic function film is different, the light intensity of the output light is weakened after the input light passes through the all-optical logic function film 50, and therefore, the optical logic operation result of the corresponding control light can be obtained according to the light intensity ratio of the output light to the input light.
In an embodiment, the all-optical logic function film includes a substrate, a silicon photonic crystal, an isolation layer film, a chalcogenide phase change material, and a capping layer film, which are stacked in sequence, and the specific structure thereof is described above and will not be described herein again. At this time, when a logic operation device is built, the aperture and the distance of the nano holes can be adjusted, so that the all-optical logic function film in the optical logic not gate or the optical logic nor gate can enhance the Fano resonance in an amorphous state and inhibit the Fano resonance in a crystalline state, and the all-optical logic function film in the optical logic or gate or the optical logic and gate can not generate the Fano resonance in the amorphous state and the crystalline state. When the logic operation is executed, the control light which enables the all-optical logic function film to be in the amorphous state represents '1', the control light which enables the all-optical logic function film to be in the crystalline state represents '0', the optical logic operation result is represented as '0' by the light intensity ratio being smaller than the judgment value, and the optical logic operation result is represented as '1' by the light intensity ratio being larger than the judgment value.
In general, a logic operation device of the three-dimensional space all-optical multi-logic function device built in the present application includes a plurality of all-optical logic function films arranged in three different directions, and each direction includes at least two parallel and opposite all-optical logic function films to form an optical logic gate in a corresponding direction, that is, an optical logic gate is formed in each direction, so that optical operations in multiple directions in a three-dimensional space can be realized. The transmittance of the all-optical logic function film is changed along with the change of the control light, the incident control light is different, the transmittance of the corresponding all-optical logic function film is different, the control light is changed into '0' and '1' through different transmittances, after the transmittance of the all-optical logic function film is regulated and controlled through the control light, the input light penetrates through all-optical logic function films in the optical logic gate, the transmittance of the output light is calculated, and then the optical logic operation result of the control light can be obtained.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A three-dimensional space all-optical multi-logic function device is characterized by comprising a first optical input device, a second optical input device, an optical output device and a logic operation device,
the logic operation device comprises a plurality of all-optical logic functional films which are respectively arranged along three different directions, each direction comprises at least two parallel and opposite all-optical logic functional films to form an optical logic gate in the corresponding direction, and the transmissivity of each all-optical logic functional film changes along with the input change of control light;
the first optical input device is used for respectively transmitting the control light incident along different directions to different all-optical logic function films,
the second optical input device is used for enabling input light to vertically penetrate through the parallel and opposite all-optical logic function thin films in any direction and outputting the input light from the optical output device to obtain output light.
2. The three-dimensional space all-optical multi-logic function device according to claim 1, further comprising a light detection device for detecting the output light and obtaining a light logic operation result corresponding to the control light according to a light intensity ratio of the output light to the input light.
3. The three-dimensional space all-optical multi-logic function device according to claim 1, wherein the all-optical logic function thin film comprises a substrate, a silicon photonic crystal, an isolation layer thin film, a chalcogenide phase change material and a cover layer thin film which are stacked in sequence, wherein the silicon photonic crystal has a nanopore array, and the crystal structure of the chalcogenide phase change material changes with the change of the input of control light.
4. The three-dimensional space all-optical multi-logic function device according to claim 3, wherein the control light that causes the all-optical logic function film to be in the amorphous state represents an input "1", and the control light that causes the all-optical logic function film to be in the crystalline state represents an output "0", wherein,
when the optical logic gate is an NOT gate or a NOR gate, the all-optical logic function film in the corresponding optical logic gate enhances the Fano resonance in an amorphous state and inhibits the Fano resonance in a crystalline state;
when the optical logic gate is an OR gate or an AND gate, the all-optical logic functional film in the corresponding optical logic gate does not generate Fano resonance in an amorphous state or a crystalline state.
5. The three-dimensional space all-optical multi-logic function device according to claim 4, wherein different optical logic gates have the same determination value, and the transmittance of the all-optical logic function film when performing the logic operation is such that the ratio of the intensity of the output light to the intensity of the input light is lower than the determination value when the optical logic operation result is "0" and higher than the determination value when the optical logic operation result is "1".
6. The three-dimensional space all-optical multi-logic function device according to claim 3, wherein the same all-optical logic function film has different size and spacing of the nanopore arrays, different nanopore arrays have different transmission spectra, different nanopore arrays in the same all-optical logic function film form different function areas, and a group of function areas facing in the same direction form an optical logic gate.
7. The three-dimensional space all-optical multi-logic function device according to claim 6, further comprising displacement control means for controlling the movement of the all-optical logic function film such that the input light and the control light act on specific nanopore arrays in the all-optical logic function film.
8. The three-dimensional space all-optical multi-logic function device according to claim 1, wherein there are two parallel opposite all-optical logic function films in each direction, and the two all-optical logic function films in each direction are respectively located at two sides of a same reference point.
9. An all-optical multiple logic operation method in a three-dimensional space is characterized by comprising the following steps:
building a logic operation device, wherein the logic operation device comprises a plurality of all-optical logic functional films which are respectively arranged along three different directions, each direction comprises at least two parallel and opposite all-optical logic functional films to form an optical logic gate in the corresponding direction, and the transmissivity of each all-optical logic functional film changes along with the input change of control light;
selecting a target optical logic gate, and respectively injecting different control lights to different all-optical logic function films in the target optical logic gate to change the transmissivity of the all-optical logic function films;
the input light vertically penetrates through all-optical logic function films in the target optical logic gate to form output light;
and detecting output light, calculating the light intensity ratio of the output light to the input light, and determining the optical logic operation result corresponding to the control light according to the light intensity ratio.
10. The method according to claim 9, wherein the all-optical logic function film comprises a substrate, a silicon photonic crystal, an isolation layer film, a chalcogenide phase change material and a cover layer film, which are stacked in sequence, wherein the silicon photonic crystal has a nanopore array, and a crystal structure of the chalcogenide phase change material changes with an input of control light, and the method further comprises:
adjusting the aperture and the distance of the nano holes to enable the all-optical logic function film in the optical logic not gate or the optical logic nor gate to enhance Fano resonance in an amorphous state and inhibit the Fano resonance in a crystalline state, so that the all-optical logic function film in the optical logic or gate or the optical logic and gate does not generate the Fano resonance in the amorphous state and the crystalline state;
the control light which makes the all-optical logic function film in an amorphous state represents '1', the control light which makes the all-optical logic function film in a crystalline state represents '0', the optical logic operation result is represented as '0' by the light intensity ratio being smaller than the judgment value, and the optical logic operation result is represented as '1' by the light intensity ratio being larger than the judgment value.
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