CN114924430A - Polarization-independent electromagnetic induction transparent super-surface device - Google Patents
Polarization-independent electromagnetic induction transparent super-surface device Download PDFInfo
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- CN114924430A CN114924430A CN202210526714.0A CN202210526714A CN114924430A CN 114924430 A CN114924430 A CN 114924430A CN 202210526714 A CN202210526714 A CN 202210526714A CN 114924430 A CN114924430 A CN 114924430A
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- 230000010287 polarization Effects 0.000 title claims abstract description 29
- 230000005674 electromagnetic induction Effects 0.000 title claims abstract description 22
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 59
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 57
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 22
- 230000000694 effects Effects 0.000 claims abstract description 16
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 11
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 8
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- 238000010586 diagram Methods 0.000 description 3
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- 238000000034 method Methods 0.000 description 3
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- 239000000758 substrate Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/0009—Materials therefor
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/0102—Constructional details, not otherwise provided for in this subclass
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/0126—Opto-optical modulation, i.e. control of one light beam by another light beam, not otherwise provided for in this subclass
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/015—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on semiconductor elements having potential barriers, e.g. having a PN or PIN junction
- G02F1/017—Structures with periodic or quasi periodic potential variation, e.g. superlattices, quantum wells
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention provides an electromagnetic induction transparent super-surface device for realizing polarization independence. The device has an array structure in the x and y directions, and the basic unit structure is characterized in that: consists of silicon dioxide 1, large graphene cross structures 2 and small graphene cross structures 3. The structure can realize the electromagnetic induction transparent effect irrelevant to polarization, and when the polarization mode of incident waves is changed, devices do not need to be replaced, and the Fermi level of graphene is adjusted to realize the functions of adjusting and modulating transparent windows and group delay. The invention can be used for modulators, slow light devices, optical switches and the like in integrated optical equipment.
Description
Technical Field
The invention relates to a polarization-independent electromagnetic induction transparent super-surface device which can be used for a slow light effect, a modulator, an optical switch and the like, and belongs to the field of electromagnetic induction transparency.
Background
The terahertz wave refers to an electromagnetic wave with the frequency within the range of 0.1 THz-10 THz and is positioned between millimeter waves and infrared. The method has potential utilization value in the fields of communication, imaging, life science, space technology, radar technology and the like, and has an extremely important development position.
In recent years, much research interest has been attracted due to the versatile properties and potential applications of metamaterials, such as perfect lenses, invisible cloaks, perfect absorbers, and the like. Graphene attracts scientific researchers' attention due to its high current-carrying mobility, low transmission loss and tunable through an applied voltage. Since the fermi energy is varied by varying the bias voltage, graphene has a greater dynamic tuning potential compared to noble metals.
The electromagnetically induced transparency effect is originally a quantum phenomenon occurring in atoms. Due to the existence of the external optical field, the different quantum states of atoms can generate coherent effect, which is the phenomenon that two resonance modes with close frequency can interact to a certain extent, and at this moment, a coherent frequency is generated near the resonance frequency, and at this frequency, the system can not absorb the electromagnetic wave with the frequency any more, but transmit the electromagnetic wave, namely, the system is transparent. At present, an electromagnetic induction transparent device based on a metamaterial has been developed in a terahertz waveband, and can be widely applied to the aspects of optical memories, slow light devices, sensors and the like.
The invention discloses a polarization-independent electromagnetic induction transparent super-surface device. The device can realize the electromagnetic induction transparency effect, the polarization direction of incident light does not affect the structure, and the frequency shift of a transparent peak and the modulation of the transmittance can be realized by changing the Fermi level of graphene.
Disclosure of Invention
The invention aims to provide an electromagnetic induction transparent super-surface device which realizes polarization independence and has the advantages of dynamic tunability, easy integration and the like.
The purpose of the invention is realized by the following steps:
the invention provides a method for realizing the basic characteristics of an electromagnetic induction transparent super-surface device irrelevant to polarization, which comprises the following steps: the graphene-based composite material consists of silicon dioxide 1, a large graphene cross structure 2 and a small graphene cross structure 3, wherein a graphene layer covers a silicon dioxide medium layer, the length l1 of the large graphene cross is 5 mu m, and the width w1 of the large graphene cross is 0.8 mu m; the length l2 of the small graphene cross is 4 μm, and the width w2 is 0.8 μm; the large graphene cross and the small graphene cross have similar plasmon resonance frequencies.
The thickness t of silicon dioxide is 0.5 μm, and the relative dielectric constant is set to 3.9; the unit structure period is 6 μm, and the silica thickness t is 0.5 μm.
In the actual processing process, a dielectric layer film is formed on a substrate firstly, then a graphene layer is formed on the dielectric layer by plating a graphene film layer chemically or physically, the graphene is engraved by photoetching or electron beam exposure according to a set period and the number of basic units, and redundant graphene films are removed to form a large graphene structure and a small graphene cross structure which are arranged in a staggered manner, so that the graphene layer with the periodic structure is formed.
And finally, after all the graphene layers are completely drawn at one time, plating a layer of conductive adhesive on the graphene layers so as to regulate the voltage of the graphene layers and realize dynamic regulation.
Incident electromagnetic waves can excite plasmon resonance of the large graphene cross structure and the small graphene cross structure and generate destructive interference, so that a transparent window appears between two plasmon resonance frequencies, namely, the electromagnetic induction transparent effect is realized, and the Fermi level E of the graphene is changed F The adjustment of the transparent window and the group delay is realized.
The invention has the beneficial effects that: 1. the electromagnetic induction transparent effect can be realized, and the transparent peak and the group delay can be dynamically adjusted; 2. the electromagnetic induction transparency irrelevant to polarization can be realized, and when the polarization mode of incident waves is changed, devices do not need to be replaced; 3. can be used for optical switches, slow light devices, modulators and the like; 4. the graphene metamaterial is selected, so that the preparation technology is mature, and the graphene metamaterial is easier to manufacture.
(IV) description of the drawings
FIG. 1 is a schematic diagram of a three-dimensional structure for implementing a polarization independent electromagnetically induced transparent super-surface device: consists of silicon dioxide 1, large graphene cross structures 2 and small graphene cross structures 3.
Fig. 2 is an array diagram of a periodic structure implementing a polarization independent electromagnetically induced transparent super-surface device, incident light being incident along the k-axis.
FIG. 3 is a top view of an electromagnetically induced transparent super-surface device implementing polarization independence: l1 and w1 respectively represent the length and width of a large graphene cross structure, l2 and w2 respectively represent the length and width of a small graphene cross structure, the unit structure period P is 6 micrometers, and the graphene at four corners of the unit structure is spliced into the small graphene cross structure.
FIG. 4 shows the Fermi level E of graphene F Transmission clouds incident at different polarization directions at 0.8 eV.
FIG. 5 is a graph of graphene Fermi level E F Transmission clouds incident at different incidence angles of 0.8 eV.
FIG. 6 shows the Fermi level E of graphene along with the electromagnetically induced transparency effect F Transmission peak plot increasing from 0.7eV to 1.0 eV.
FIG. 7 shows the Fermi level E of graphene along with the electromagnetically induced transparency effect F Group delay plot when increasing from 0.7eV to 1.0 eV.
(V) detailed description of the preferred embodiments
The invention is further illustrated below with reference to specific examples.
The specific embodiment is as follows: an electromagnetic induction transparent super-surface device for realizing polarization independence is shown in figures 1 and 2 and is of an array structure, a unit structure takes silicon dioxide 1 as a medium layer, a large graphene cross structure 2 and a small graphene cross structure 3, a graphene layer covers the silicon dioxide medium, and the small graphene cross structure is formed by splicing graphene structures at four corners of the unit structure.
As shown in fig. 3, the length l1 of the large graphene cross is 5 μm, and the width w1 is 0.8 μm; the length l2 of the small graphene cross is 4 μm, and the width w2 is 0.8 μm; the unit structure period is 6 μm, and the silica thickness t is 0.5 μm.
Big graphite alkene cross and little graphite alkene cross have close plasmon resonance frequency, and the incident light vertical incidence of arbitrary polarization this structure can excite the plasmon resonance of two sets of graphite alkene cross structures, can appear a transparent peak between two plasmon resonance frequencies, electromagnetism induction transparent effect promptly.
When the graphene Fermi level E F At 0.8eV, the transmission peaks of the incident light with different polarization directions are completely coincident with each other, and for the convenience of viewing the effect, a projection cloud diagram is used to show the structure, as shown in fig. 4, which illustrates that the structure has a polarization-independent characteristic, so that when the polarization direction of the incident light is changed, the structure can be unchanged to maintain the electromagnetic induction effect.
When the graphene Fermi level E is as shown in FIG. 5 F When the incident angle of the incident light is changed, the structure can be kept unchanged to maintain the electromagnetic induction effect, because the incident light with different incident angles has no influence on the electromagnetic induction transparent effect of the structure when the incident angle of the incident light is changed.
As shown in fig. 6 and 7, when E F When the thickness is increased from 0.7eV to 1.0eV, the position of the transmission peak moves to a high frequency, which shows that the movement of carriers is violent along with the change of the Fermi level, the surface conductivity of the graphene is changed, and the corresponding group delay is gradually increased, which shows that the E can be changed F And dynamic adjustment of the electromagnetic induction transparent effect is realized.
In summary, the present invention is an electromagnetically induced transparent super-surface device that achieves polarization independence.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, improvement and the like made on the basis of the present invention by a person of ordinary skill in the art shall be included in the protection scope of the present invention.
Claims (6)
1. An electromagnetically induced transparent super-surface device that achieves polarization independence. The device has an array structure in the x and y directions, and the basic unit structure is characterized in that: the graphene cross structure is composed of silicon dioxide 1, a large graphene cross structure 2 and a small graphene cross structure 3, incident light polarized at random is perpendicularly incident to the structure, plasmon resonances of two groups of graphene cross structures can be excited, a transparent peak can appear between two plasmon resonance frequencies, and the transparent effect is induced by electromagnetism.
2. A transparent, polarization independent, electromagnetically induced super-surface device as claimed in claim 1, wherein: the length I1 of the large graphene cross is 5 μm, and the width w1 is 0.8 μm; the length I2 of the small graphene cross is 4 mu m, and the width w2 is 0.8 mu m; the large graphene cross and the small graphene cross have similar plasmon resonance frequencies.
3. The device according to claim 1, wherein said device comprises: the unit structure period was 6 μm, the silica thickness was 0.5 μm, and the relative dielectric constant was 3.9.
4. A transparent, polarization independent, electromagnetically induced super-surface device as claimed in claim 1, wherein: the structure can realize the electromagnetic induction transparent effect, and the Fermi level of the graphene is adjusted to realize the functions of adjusting and modulating the transparent window and the group delay.
5. A transparent, polarization independent, electromagnetically induced super-surface device as claimed in claim 1, wherein: the structure can realize the electromagnetic induction transparent effect, has no relation to the polarization angle of incident light, and does not need to replace devices when the polarization mode of the incident wave is changed.
6. A transparent, polarization independent, electromagnetically induced super-surface device as claimed in claim 1, wherein: the structure is insensitive to the incident angle of 0-60 degrees when realizing the electromagnetic induction transparent function.
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| CN202210526714.0A CN114924430A (en) | 2022-05-16 | 2022-05-16 | Polarization-independent electromagnetic induction transparent super-surface device |
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| CN202210526714.0A CN114924430A (en) | 2022-05-16 | 2022-05-16 | Polarization-independent electromagnetic induction transparent super-surface device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115764323A (en) * | 2023-01-05 | 2023-03-07 | 湖南第一师范学院 | Method, apparatus and medium for designing polarization independent super surface with specific function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115764323A (en) * | 2023-01-05 | 2023-03-07 | 湖南第一师范学院 | Method, apparatus and medium for designing polarization independent super surface with specific function |
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