KR101984200B1 - Optical identification element for terahertz wave, apparatus for detecting optical identification element for terahertz wave and, writing appartus for identification unit - Google Patents

Abstract

In the optical identification device for a terahertz wave according to an embodiment of the present invention, when a terahertz wave transmitting layer made of a material that transmits a terahertz wave and a transmitted terahertz wave are irradiated, resonance occurs at a natural resonant frequency, Includes m identification units each composed of a waveguide diffraction grating that is any one of a first to n-th unique resonance frequencies to an n-th unique resonance frequency.

Description

TECHNICAL FIELD [0001] The present invention relates to an optical identification device for a terahertz wave, an optical identification device for a terahertz wave, an optical identification device for a terahertz wave, and a writing device for an identification unit. BACKGROUND OF THE INVENTION 1. Field of the Invention [0002]

The present invention relates to an optical identification device which is difficult to confirm information in visible light, ultraviolet light, near-infrared light, etc., and can confirm information only in terahertz wave, and thus can not be visually recognized.

Currently, bar codes are widely used as identification devices. Generally, the bar code was originally developed in Wallace Flin's 'Supermarket Calculation Automation' paper in 1932, and is now printed on almost every item, and the purchase and sale of the goods by the point of sale system (POS) It is managed automatically. In addition, IT technologies such as postal automation, factory automation, inventory management, library, document management, and medical information are rapidly increasing in use. Recently, with the emergence of smartphones, an application has been developed that can retrieve barcode images in real time and retrieve prices and lowest prices of products.

The barcode signal is a continuous combination of a black module and a white module, and the information is encoded according to the width and the ratio of each module. In order to decode accurate information, the size of the module must be restored within an error range.

However, since the barcode is a continuous combination of a black module and a white module, information is encoded according to the width and the ratio of each module, so there is a limit in that a lot of information can not be encoded in a predetermined space. , There is a limit to apply to fields such as security or anti-counterfeiting.

by using m identification units each including a waveguide diffraction grating having any one of the n resonant frequencies, it is possible not only to express a large amount of identification codes within a small area, but also to recognize optical identification elements with the naked eye And to provide a terahertz wave optical identification device technology with excellent security.

Other objects and advantages of the present invention will become apparent from the following description, and it will be understood by those skilled in the art that the present invention is not limited thereto. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

In the optical identification device for a terahertz wave according to an embodiment of the present invention, when a terahertz wave transmitting layer made of a material that transmits a terahertz wave and a transmitted terahertz wave are irradiated, resonance occurs at a natural resonant frequency, Is a waveguide diffraction grating that is any one of a first specific resonance frequency to an n-th specific resonance frequency.

Since the optical identifying element for terahertz has n kinds of natural resonance frequencies and the number of identification units is m, the identification code that can be expressed is n ^m .

The arrangement of the identification units may mean identification information different from the identification code.

The identification units may be arranged in the shape of at least one of linear, circular, square, lattice, and crossed shapes.

According to another embodiment of the present invention, there is provided an apparatus for recognizing an optical identification element for a terahertz wave, comprising: a terahertz wave transmitting layer made of a material that transmits a terahertz wave; and a resonator at a specific resonance frequency when the transmitted terahertz wave is irradiated Wherein the intrinsic resonance frequency is a terahertz wave optical identification element including m identification units composed of a waveguide diffraction grating that is any one of a first natural resonance frequency to an n-th natural resonance frequency, and a terahertz wave optical identification element, A light source for irradiating the wave, and a detector for detecting the intrinsic resonance frequency of the terahertz wave generated from the terahertz wave optical identifying element.

The terahertz wave optical identifying device recognizing device may further include a recognizing unit that recognizes the identifying code based on the intrinsic resonance frequency detected for each identifying unit.

The terahertz wave optical identifying device recognizing device may further include a light source-detecting unit moving unit that moves the light source such that the terahertz wave generated from the light source is sequentially irradiated to the identification units, and simultaneously moves the detecting unit as the light source moves .

The terahertz wave optical identifying device recognizing device may further include an optical identifying device moving part that moves the terahertz wave optical identifying device so that the terahertz wave generated from the light source is sequentially irradiated to the identifying units.

The terahertz wave optical identifying device recognizing device includes a light source-detecting portion moving portion for moving the light source in one direction and simultaneously moving the detecting portion as the light source is moved, and an optical identifying device moving portion for moving the terahertz wave optical identifying device in the other direction .

The light source may be a light source array including a plurality of light sources capable of generating terahertz waves, and the detection unit may be a detection array including a plurality of detection units matched to the light source array.

According to another aspect of the present invention, there is provided a lighting apparatus for an identification unit, comprising: a terahertz wave transmitting layer made of a material for transmitting a terahertz wave; and a transmitting unit having a different resonant frequency for each frequency band set for the transmitted terahertz wave An identification unit including a waveguide diffraction grating, and a modulator for changing the intrinsic resonance frequency of the waveguide diffraction grating to another intrinsic resonance frequency within a set frequency band.

The modulator can change the intrinsic resonance frequency of the waveguide diffraction grating to another intrinsic resonance frequency within a set frequency band by irradiating light, applying heat, or applying electricity.

According to the disclosed invention, since one identification unit can represent n, a large number of identification codes can be represented within a small area using a small number of identification units.

In addition, since the optical identification device for terahertz wave can not be visually recognized in the visible light and the infrared region, it is excellent in security and can be utilized in various fields.

In addition, since the identification unit is not required to be produced for each resonance frequency, the production cost of the identification unit and the optical identification device can be reduced.

In addition, user convenience can be enhanced by changing the identification unit to a desired resonance frequency in the field using a writing device for the identification unit by a user or the like to generate an identification code.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a view for explaining an optical identifying element for a terahertz wave according to an embodiment of the present invention; FIG.
2A to 2D are diagrams for explaining the optical identifying element for a terahertz wave according to an embodiment of the present invention.
FIGS. 3A to 3D are views for explaining an optical identification device for a terahertz wave according to an embodiment of the present invention. FIG.
4 is a view for explaining an apparatus for recognizing a terahertz wave optical identification device according to another embodiment of the present invention.
5 is a view for explaining an apparatus for recognizing a terahertz wave optical identification device according to another embodiment of the present invention.
6A to 6C are views for explaining a lighting apparatus for an identification unit according to an embodiment of the present invention.
7 is a view for explaining a waveguide diffraction grating according to an embodiment of the present invention.
8A to 8J are views for explaining an example in which an optical identifying element for a terahertz wave is applied to an object according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a view for explaining an optical identifying element for a terahertz wave according to an embodiment of the present invention; FIG.

Referring to FIG. 1, a terahertz wave optical identification device 100 may include m identification units. Each identification unit may include a terahertz wave transmission layer 110, a waveguide grating 120, and a substrate layer 130. In the present embodiment, the case where the number of identification units is eight will be described, but the number of identification units is not limited thereto. The area of the identification unit can be influenced by the irradiated area, intrinsic resonance frequency, lattice period, etc., which is most affected by the irradiated area. For example, if the irradiation beam diameter of the terahertz wave is 6 mm, the area of the identification unit may be 8 mm * 8 mm. As described above, since the diameter of the irradiation beam of the terahertz wave is small, the area of the identification unit is also very small.

The terahertz wave permeable layer 110 is made of a material that transmits a terahertz wave.

When the terahertz wave transmitted through the terahertz wave transmitting layer 110 is irradiated, the waveguide diffraction grating 120 can generate a terahertz wave having a specific resonant frequency. Here, the natural resonance frequency may be any one of the first natural resonance frequency to the n-th natural frequency. For example, the first natural resonance frequency may be f ₁ . If n is 10, then the natural resonance frequency can be any one of 10 natural resonance frequencies. (The term "natural resonance frequency" is used in the patent related to wrapping paper. I'll do it.)

The waveguide diffraction grating 120 may be formed of a material such as photosensitive, thermal, or electrosensitive.

The waveguide grating 120 may include grooves or ridges formed on the surface of the dielectric slab. As another example, the diffraction grating is a planar dielectric sheet having a periodically alternating refractive index (e.g., a phase grating) in the dielectric sheet. The exemplary phase grating may be formed by forming an array of periodic holes in and through the dielectric sheet.

The waveguide diffraction grating 120 may comprise either a one-dimensional (1D) diffraction grating or a two-dimensional diffraction grating. The 1D diffraction grating may for example include a set of substantially straight grooves that are periodic and parallel only in a first direction (e.g. along the x-axis). An example of a 2D diffraction grating can include an array of holes in a dielectric slab or sheet, wherein the holes are periodically spaced (e.g. along both the x- and y-axes) according to two orthogonal directions . At this time, the 2D diffraction grating is also called a photonic crystal.

The substrate layer 130 may be a layer that can be coupled with the waveguide grating 120 to fix the waveguide grating 120.

In the terahertz wave optical identifying device 100, when the number of types of natural resonant frequencies is n and the number of identification units is m, the number of identifiable identification codes is n ^m . For example, when the number of types of the natural resonance frequencies is 10 and the number of identification units is 2, the identification code is 10 ² = 100. In this manner, the terahertz wave optical identification device 100 can represent 100 identification codes even when only two identification units are used. As another example, if the kind of the natural resonance frequency is 10, and the number of identification units is 8, the identification code becomes 10 ⁸ = 100.000000.

Therefore, the terahertz wave optical identification element can express a large amount of identification code within a small area.

Further, since the terahertz wave optical identifying device can not recognize the optical identifying device with the naked eye, the terahertz wave optical identifying device is also excellent in security.

2A to 2E are views for specifically explaining an optical identifying element for a terahertz wave according to an embodiment of the present invention.

2A is a graph showing the detection and generation of terahertz waves reflected from a terahertz wave optical identifying element.

Referring to FIG. 2A, each of the identification units 1 to n may have a specific resonance frequency f ₁ , f _{2, f 3} to fn, respectively. For example, the first identification unit 1 has a first natural resonance frequency f ₁ , the second identification unit 2 has a second natural resonance frequency f ₂ , and the n-th identification unit n May have an n-th unique resonance frequency fn.

2B is a graph showing the detection and transmission of a terahertz wave transmitted from a terahertz wave optical identifying element.

Referring to FIG. 2B, each of the identification units 1 to n may have a specific resonance frequency f ₁ , f _{2, f 3} to fn, respectively. For example, the first identification unit 1 has a first natural resonance frequency f ₁ , the second identification unit 2 has a second natural resonance frequency f ₂ , and the n-th identification unit n May have an n-th unique resonance frequency fn.

2C is a view for explaining an optical identifying element for terahertz consisting of 16 identification units.

Referring to FIG. 2C, a total of 16 identification units are provided, and a total of 16 identification units include a combination of 10 identification units 1 to 10 having respective natural resonance frequencies f ₁ , f _{2, f 3} to f ₁₀ ≪ / RTI > Specifically, the first identifying unit is a first identifying unit 1 having a first specific resonance frequency f ₁ , the second identifying unit is a fourth identifying unit 4 having a fourth specific resonance frequency f ₄ , , The third identification unit is the second identification unit 2 having the second specific resonance frequency f ₂ , and the identification units existing at the remaining positions can be composed of the identification units as shown in FIG. 2C.

2D is a diagram for explaining the number of identification codes that can be represented when the number of types of natural resonance frequencies is n and the number of identification units is m.

Referring to FIG. 2d, since n types of the resonance frequencies of the identification units that can be formed in each identification unit are n, and the optical identification elements for terahertz are composed of 16 identification units in total, dog is n ^16.

Figure 2E is a diagram for explaining the arrangement of various types of identification units.

Referring to FIG. 2E, the identification units may be arranged in various forms, and the type of arrangement may mean identification codes and other identification information. The identification units may be arranged in various forms, such as linear, circular, square, lattice, and crossed.

Referring to Figures 2 (a) to 2 (c), the identification units may be arranged in line, crossed and circular band shapes. In this case, the line shape means A object, the crossed shape means B object, and the circular band shape can mean C object. In this way, the arrangement type of the identification units can be used as the identification information.

FIGS. 3A to 3D are views for explaining an optical identification device for a terahertz wave according to an embodiment of the present invention. FIG.

3A, the terahertz wave optical identifying device recognizing device may include a terahertz wave optical identifying device 300a, a light source 310a, and a detecting unit 320a.

The terahertz wave optical identification device 300a has a terahertz wave transmission layer made of a material that transmits a terahertz wave, and when the transmitted terahertz wave is irradiated, resonance occurs at a specific resonance frequency, And an m number of identification units composed of a waveguide diffraction grating that is any one of a resonance frequency to an n-th unique resonance frequency.

The light source 310a can irradiate a terahertz wave with the terahertz wave optical identifying element 300a. For example, the light source 310a may be various types of devices capable of generating terahertz waves. Terahertz blue An electromagnetic wave located in the region between infrared rays and microwaves, and can generally have a frequency of 0.1 THz to 10 THz. However, it should be understood that the present invention can be considered as a terahertz wave even if it is somewhat deviated from such a range, as long as those skilled in the art can easily contemplate the present invention.

The detecting unit 320a can detect the intrinsic resonance frequency of the terahertz wave reflected from the terahertz wave optical identifying device 300a.

The recognition unit 330a can recognize the identification code based on the intrinsic resonance frequency of the terahertz wave reflected from the terahertz wave optical identification element 300a. For example, when there are four identification units, the identification unit (not shown) can recognize the identification code based on the type of the inherent resonance frequency of the terahertz wave reflected from each identification unit. Specifically, for example, when the intrinsic resonance frequencies of the reflected terahertz waves are f ₁ , f _9, f _{2, and f 3} , the identification code may be 1/9/2/3. As described above, the number of each digit of the identification code is not simply expressed as 0/1, but the number of each digit can be expressed by the same numerical value as the kind of the specific resonance frequency. If the kind of the natural resonance frequency is 15, the number of each of the identification codes can be expressed as 0 to 15. Therefore, the number of the identification codes that can be expressed is 15 ⁴ .

The light source-detecting unit moving unit (not shown) moves the light source 310a so that the terahertz wave generated from the light source 310a is sequentially irradiated to the identification units. At the same time, the detection unit 320a moves the light source 310a, . Accordingly, the terahertz wave optical identifying device recognizing device can scan the identification units by moving the light source 310a and the detecting portion 320a while the optical identifying device 300a for terahertz is fixed.

Referring to FIG. 3B, the terahertz wave optical identifying device recognizing device may include a terahertz wave optical identifying device 300b, a light source 310b, and a detecting unit 320b.

The terahertz wave optical identifying device 300b has a terahertz wave transmitting layer made of a material that transmits a terahertz wave, and when the transmitted terahertz wave is irradiated, resonance occurs at a specific resonant frequency, And an m number of identification units composed of a waveguide diffraction grating that is any one of a resonance frequency to an n-th unique resonance frequency.

The light source 310b can irradiate a terahertz wave with the terahertz wave optical identifying element 300b.

The detecting unit 320b can detect the intrinsic resonance frequency of the terahertz wave reflected from the terahertz wave optical identifying device 300b.

The optical identifying element moving unit (not shown) may move the terahertz wave optical identifying element 300b such that the terahertz wave generated by the light source 310b is sequentially irradiated to the identifying units. Accordingly, the terahertz wave optical identification device can scan the identification units by moving the optical identification device 300a for terahertz in a state where the light source 310a and the detection unit 320a are fixed.

Referring to FIG. 3C, the terahertz wave optical identifying device recognizing device may include a terahertz wave optical identifying device 300c, a light source 310c, and a detecting unit 320c.

The terahertz wave optical identifying device 300c has a terahertz wave transmitting layer made of a material that transmits a terahertz wave, and when the transmitted terahertz wave is irradiated, resonance occurs at a natural resonant frequency, And an m number of identification units composed of a waveguide diffraction grating that is any one of a resonance frequency to an n-th unique resonance frequency.

The light source 310c can irradiate a terahertz wave with the terahertz wave optical identifying element 300c.

The detecting unit 320c can detect the intrinsic resonance frequency of the terahertz wave transmitted from the terahertz wave optical identifying device 300c.

The light source-detecting unit moving unit (not shown) moves the light source 310c so that the terahertz wave generated by the light source 310c is sequentially irradiated to the identification units. At the same time, . Accordingly, in the terahertz wave optical identification device recognition device, the optical identification device 300c for terahertz can scan the identification units by moving the light source 310c and the detection unit 320c in a fixed state.

Referring to FIG. 3D, the terahertz wave optical identifying device recognizing device may include a terahertz wave optical identifying device 300d, a light source 310d, and a detecting unit 320d.

The terahertz wave optical identification device 300d has a terahertz wave transmission layer made of a material that transmits a terahertz wave, and when the transmitted terahertz wave is irradiated, resonance occurs at a specific resonance frequency, And an m number of identification units composed of a waveguide diffraction grating that is any one of a resonance frequency to an n-th unique resonance frequency.

The light source 310d can irradiate a terahertz wave with the terahertz wave optical identifying element 300d.

The detecting unit 320d can detect the intrinsic resonance frequency of the terahertz wave transmitted from the terahertz wave optical identifying device 300d.

The optical identifying element moving unit (not shown) may move the terahertz wave optical identifying element 300d such that the terahertz wave generated by the light source 310d is sequentially irradiated to the identifying units. Accordingly, the terahertz wave optical identifying device recognizing device can scan the identification units by moving the optical identifying device 300d for terahertz in a state where the light source 310d and the detecting unit 320d are fixed.

4 is a view for explaining an apparatus for recognizing a terahertz wave optical identification device according to another embodiment of the present invention.

Referring to FIG. 4, the terahertz wave optical identifying device recognizing device may include a terahertz wave optical identifying device 400, a light source 410, and a detecting unit 420.

The light source 410 may be in the form of an array including a plurality of light sources capable of generating terahertz waves.

The detection unit 420 may be in the form of a detector array including several detection units matched to the light source array.

In this embodiment, the light source 410 is an array in which four light sources are arranged in a straight line, and the detection unit 420 may be an array in which four detection units are arranged in a straight line. The array of detectors 420 may be matched 1: 1 to the array of light sources.

The optical identification element moving unit (not shown) may move (430) the terahertz wave optical identification element 400 so that the terahertz wave generated in the light source array is sequentially irradiated to the identification units. Accordingly, the terahertz wave optical identifying device recognizing device can scan the identification units by moving the optical identifying device 400 for terahertz in a fixed state of the light source array and the detecting array.

5 is a view for explaining an apparatus for recognizing a terahertz wave optical identification device according to another embodiment of the present invention.

5, the terahertz wave optical identifying device recognizing device may include a terahertz wave optical identifying device 500, a light source 510, and a detecting unit 520. FIG.

The light source 510 can irradiate a terahertz wave with the terahertz wave optical identifying element 500.

The detection unit 520 can detect the intrinsic resonance frequency of the terahertz wave transmitted from the terahertz wave optical identification device 500.

The light source-detecting unit moving unit (not shown) moves the light source 510 to the one direction 530 and moves the detecting unit 520 as much as the light source 510 is moved.

The optical identification element moving unit (not shown) may move the optical identification element 500 for the terahertz wave in the other direction 540.

Accordingly, the terahertz wave optical identifying device recognizing device can scan the identifying units by organically moving the terahertz wave optical identifying device 500, the light source 510, and the detecting unit 520.

6A to 6C are views for explaining a lighting apparatus for an identification unit according to an embodiment of the present invention.

Referring to FIG. 6A, the intrinsic resonance frequency can be set for each frequency band (G1, G2, ..., Gm). The frequency band may be set based on a frequency band that can be changed by the modulation unit (610b in Fig. 6B). For example, when the frequency band of the modulation unit (610b of Fig. 6b) can be changed relative to the f ₂ f ₃ f in _1, a first frequency band (G1) is in the _f3 f _1. If the modulator (Fig. 6b of 610b) the frequency band that can be changed based on the f ₅ f ₆ f at _4, a first frequency band (G1) is in the f ₆ f _4.

Referring to FIG. 6B, the lighting apparatus for the identification unit may include an identification unit 600b and a modulation unit 610b. Identification unit (600b) is a waveguide diffraction grating having a specific resonance frequency (f ₂₎ corresponding to the frequency band (G1) is set for the terahertz wave transmitting layer made of a material that transmits the terahertz wave, the transmitted terahertz wave . ≪ / RTI >

The modulator 610b can change the intrinsic resonance frequency of the waveguide diffraction grating to another intrinsic resonance frequency within a set frequency band. For example, the modulation unit (610b) can be changed within a frequency band (G1) set the natural resonant frequency of the waveguide diffraction grating (f ₂₎ to a different natural resonant frequency (f ₁ or f _3).

As a concrete example of a method for changing the resonance frequency, the modulator 610b can change the natural resonance frequency of the waveguide diffraction grating to another natural resonance frequency within a set frequency band. A detailed description thereof will be given later with reference to FIG. 7 below.

Referring to FIG. 6C, the lighting apparatus for the identification unit may include an identification unit 600c and a modulation unit 610c. Discrimination unit (600c) is a waveguide diffraction grating having a specific resonance frequency (f ₅₎ corresponding to the terahertz wave transmitted through layer, and the band (G2) is set for the transmitted terahertz wave made of a material that transmits the terahertz wave . ≪ / RTI >

The modulator 610c can change the intrinsic resonance frequency of the waveguide diffraction grating to another intrinsic resonance frequency within a set frequency band. Modulator (610c) can be changed within a frequency band (G2) is set a specific resonance frequency of the waveguide diffraction grating (f ₅₎ to a different natural resonant frequency (f ₄ or f _6).

Thus, by using the lighting apparatus for the identification unit, the user or the like can freely change the resonance frequency of the identification unit within the set resonance frequency range. Therefore, the production cost of the identification unit and the optical identification device can be reduced because the identification unit is not required to be produced for each resonance frequency. In addition, user convenience can be increased by changing the identification unit to a desired resonance frequency in the field using a lighting device for the identification unit.

7 is a view for explaining a waveguide diffraction grating according to an embodiment of the present invention.

Referring to Figure 7 (a), the identification unit may include a waveguide grating that causes a Guided Mode Resonance (GMR) for a particular frequency.

The waveguide diffraction grating layer 702 can diffract the incident light under a given condition (frequency of incident light, incident angle, waveguide thickness, effective refractive index, etc.). The higher order diffraction waves except for the zeroth order can form a guided mode in the waveguide diffraction grating layer 702. At this time, the zero-order reflected wave-transmission wave occurs in guided mode and phase matching, and resonance occurs in which the energy of the waveguide mode is transmitted again to the zero-order reflected wave-transmission wave. As resonance occurs, the 0th order reflection diffraction wave is 100% reflected by the constructive interference, and 0th order transmission diffraction wave is 0% transmission by destructive interference, resulting in a very sharp resonance curve in a specific frequency band.

7 (b) shows a diffraction grating (n _H = 1.80, n _L = 1.72, thickness = 80 μm, period = 200 μm) formed on a transparent polymethylpentene substrate (n = 1.46) This is the GMR calculation result calculated by differential factor method (resonance occurs at 0.89 THz).

7A, the dielectric constant of the cover layer 701 is? ₁ , the dielectric constant of the waveguide diffraction grating layer 702 is? ₂ , the dielectric constant of the lower substrate layer 703 is? ₃ , The dielectric constant epsilon ₂ of the waveguide diffraction grating layer can be expressed by the following equation (1).

[Equation 1]

Where ε _g is the mean value of the configuration of the diffraction grating, and repeating two types of dielectric constant (ε _H, ε _L) is, △ ε is the maximum amount of change in dielectric constant at, K is 2π / Λ, as the grid frequency Λ is the period of the grating And x is the distance from the origin to the X axis direction.

In this case, in order for the waveguide diffraction grating to resonate at a specific frequency and incident angle of the incident light, that is, to generate the waveguide mode, the effective refractive index N of the waveguide satisfies the following condition.

)|N|<

max (

) | N | <

Particularly, a photochromic material, a thermochromic material, and an electrochromic material are injected into the waveguide diffraction grating to apply appropriate light, heat, and electricity from the outside to the diffraction grating to change the refractive index ([Delta] [epsilon]). For example, the resonance frequency of the waveguide diffraction grating can be changed by irradiating light through the modulation section 610b, applying heat, or applying electricity to change DELTA epsilon.

7 (c) is a perspective view for explaining the structure and the shape of the waveguide diffraction grating.

The diffraction grating may include grooves or ridges formed on the surface of the dielectric slab. As another example, the diffraction grating is a planar dielectric sheet having a periodically alternating refractive index (e.g., a phase grating) in the dielectric sheet. The exemplary phase grating may be formed by forming an array of periodic holes in and through the dielectric sheet.

As another example, the diffraction grating can include either a one-dimensional (1D) diffraction grating or a two-dimensional diffraction grating. The 1D diffraction grating may for example include a set of substantially straight grooves that are periodic and parallel only in a first direction (e.g. along the x-axis). An example of a 2D diffraction grating can include an array of holes in a dielectric slab or sheet, wherein the holes are periodically spaced (e.g. along both the x- and y-axes) according to two orthogonal directions . At this time, the 2D diffraction grating is also called a photonic crystal.

8A to 8J are views for explaining an example in which an optical identifying element for a terahertz wave is applied to an object according to an embodiment of the present invention.

Although the optical identifying element 800 for the terahertz wave shown in Figs. 8A to 8J is shown as being viewed by the naked eye, it can not be confirmed whether or not the terahertz wave optical identifying element 800 exists in the human eye.

Referring to FIG. 8A, the terahertz wave optical identifying element 800 may be attached or inserted into a hat, military uniform, etc., of a soldier. In this case, the terahertz wave optical identification device 800 can be used as a label for identifying the enemy army and the army army.

Referring to FIG. 8B, the terahertz wave optical identifying element 801 can be attached to or inserted into an expensive loop, an inner skin, or the like of a bag. In this case, the terahertz wave optical identifying element 801 can be used as a marker for identifying the genuine article and the article.

Referring to FIG. 8C, the terahertz wave optical identification element 802 may be attached or inserted into a bottle containing expensive alcohol. In this case, the terahertz wave optical identifying element 802 can be used as a marker for identifying the genuine article and the article.

8D, the terahertz wave optical identification element 803 can be attached to or inserted into an IC chip or the like. In this case, the terahertz wave optical identifying element 803 can be used as a marker for identifying a plurality of IC chips.

Referring to FIG. 8E, the terahertz wave optical identifying element 804 can be attached to or inserted into a money or the like. In this case, the terahertz wave optical identifying element 804 can be used as a marker for distinguishing real money and counterfeit money.

Referring to FIG. 8F, the terahertz wave optical identifying element 805 can be attached or inserted into a gun or the like. In this case, the terahertz wave optical identifying element 805 can be used as a marker to identify multiple firearms.

Referring to FIG. 8G, the terahertz wave optical identification element 806 can be attached or inserted into a high-priced accessory or the like. In this case, the terahertz wave optical identifying element 806 can be used as a marker for identifying the genuine article and the article.

8H, the terahertz wave optical identifying element 807 can be attached or inserted into a food container or the like. In this case, the terahertz wave optical identification element 807 can be used as a label for identifying a plurality of food containers.

Referring to Fig. 8i, the terahertz wave optical identifying element 808 can be attached or inserted into a book or the like. In this case, the terahertz wave optical identifying element 808 can be used as a marker to identify multiple books.

Referring to FIG. 8J, the terahertz wave optical identification element 809 may be attached or inserted into a human body or an animal. In this case, the terahertz wave optical identifying element 809 can be used as a marker for identifying a person or an animal.

The optical identifying element for terahertz wave according to this embodiment can be attached to or inserted into various objects in addition to the examples described above.

The embodiments described may be constructed by selectively combining all or a part of each embodiment so that various modifications can be made.

It should also be noted that the embodiments are for explanation purposes only, and not for the purpose of limitation. In addition, it will be understood by those of ordinary skill in the art that various embodiments are possible within the scope of the technical idea of the present invention.

100: a terahertz wave with an optical identifying element
110: permeable layer
120: waveguide diffraction grating
130: substrate layer

Claims (12)

And m identification units disposed adjacent to each other and having different natural resonance frequencies,
Each of the m identification units
A terahertz wave transmission layer made of a material that transmits a terahertz wave; And
(Guided Mode Resonance) at any one of natural resonance frequencies from a first natural resonance frequency to an n-th natural resonance frequency, and when the transmitted THz waves are irradiated, And a waveguide grating in which resonance occurs at any one of natural resonance frequencies of the waveguide grating,
Wherein the type of the natural resonance frequency is n, the number of the identification units is m, and the identification code that can be expressed using m identification units is n ^m .
delete The method according to claim 1,
Wherein the arrangement of the identification units means identification information different from the identification code.
The method of claim 3,
The identification units
Arranged in the shape of at least one of linear, circular, square, lattice-like, and cross-shaped.
A plurality of m identification units disposed adjacent to each other and having different natural resonance frequencies, wherein each of the m identification units comprises a terahertz wave transmission layer made of a material that transmits a terahertz wave; And guided mode resonance (GMR) at any one of natural resonance frequencies from the first natural resonance frequency to the n-th natural resonance frequency, and when the transmitted THz waves are irradiated, Wherein the number of types of the resonant frequencies is n, the number of the identification units is m, and the number of the identification units is expressed using m identification units. The optical identification element for terahertz wave, wherein the identification code is n ^m ;
A light source for irradiating a terahertz wave with the terahertz wave optical identification element; And
And a detector for detecting a resonant frequency of the terahertz wave generated from the terahertz wave optical identifying element.
6. The method of claim 5,
And a recognition unit for recognizing an identification code based on a natural resonance frequency detected for each of the identification units.
6. The method of claim 5,
And a light source-detector section moving section for moving the light source so that the terahertz wave generated from the light source is sequentially irradiated to the identification units and moving the detection section as far as the light source is moved. Recognition device.
6. The method of claim 5,
Further comprising an optical identifying element moving section for moving the terahertz wave optical identifying element so that the terahertz wave generated from the light source is sequentially irradiated to the identifying units.
6. The method of claim 5,
A light source-detecting unit moving unit moving the light source in one direction and simultaneously moving the detecting unit as the light source moves; And
Further comprising an optical identifying element moving section for moving the optical identifying element for terahertz wave in the other direction.
6. The method of claim 5,
The light source
A light source array including a plurality of light sources capable of generating a terahertz wave,
Wherein:
And an array of detectors including a plurality of detectors matched to the array of light sources.
A plurality of m identification units disposed adjacent to each other and having different natural resonance frequencies, wherein each of the m identification units comprises a terahertz wave transmission layer made of a material that transmits a terahertz wave; And guided mode resonance (GMR) at any one of natural resonance frequencies from the first natural resonance frequency to the n-th natural resonance frequency, and when the transmitted THz waves are irradiated, Wherein the number of types of the resonant frequencies is n, the number of the identification units is m, and the number of the identification units is expressed using m identification units. The optical identification element for terahertz wave, wherein the identification code is n ^m ; And
And a modulator for changing the intrinsic resonance frequency of the waveguide diffraction grating to another intrinsic resonance frequency within the set frequency band.
12. The method of claim 11,
The waveguide diffraction grating includes:
A photochromic discoloration material, a thermochromic discoloration material or an electrochromic discoloration material,
Wherein the modulator comprises:
Wherein the intrinsic resonance frequency of the waveguide diffraction grating is changed to another intrinsic resonance frequency within the set frequency band by irradiating light, applying heat, or applying electricity.

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