CN113300118B - Double-function device for realizing electromagnetic induction transparency and perfect absorption - Google Patents
Double-function device for realizing electromagnetic induction transparency and perfect absorption Download PDFInfo
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- CN113300118B CN113300118B CN202110617346.6A CN202110617346A CN113300118B CN 113300118 B CN113300118 B CN 113300118B CN 202110617346 A CN202110617346 A CN 202110617346A CN 113300118 B CN113300118 B CN 113300118B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0086—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices having materials with a synthesized negative refractive index, e.g. metamaterials or left-handed materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
- H01Q15/002—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective said selective devices being reconfigurable or tunable, e.g. using switches or diodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
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Abstract
The invention provides a double-function device for realizing electromagnetic induction transparency and perfect absorption. The device is in an array structure on the plane of a basic unit structure, and the basic unit structure is characterized in that: the graphene open ring is composed of vanadium dioxide 1, silicon dioxide 2, a graphene open ring 3 and a graphene strip 4, wherein the graphene strip 4 is inserted into the graphene open ring 3 along the long axis direction and is not in contact with the inner side of the open ring. When the vanadium dioxide has smaller conductivity and is shown as an insulator, the structure can realize the electromagnetic induction transparent effect, and the Fermi level of the graphene and the conductivity of the vanadium dioxide are adjusted to realize the functions of adjusting and modulating the transparent window and the group delay; when the conductivity of the vanadium dioxide is increased to show that the vanadium dioxide is metallic, the structure can realize a perfect absorption function of a dual-frequency band, and an absorption peak can be tuned by controlling the Fermi level of graphene. The invention can be used for modulators, slow light devices, optical switches, perfect absorbers and the like in integrated optical equipment.
Description
Technical Field
The invention relates to a dual-function device for realizing electromagnetic induction transparency and perfect absorption, which can be used for a slow light effect, a modulator, an optical switch, perfect absorption and the like, and belongs to the field of electromagnetic induction transparency and metamaterial wave absorbers.
Background
In recent years, many research interests have been attracted due to the multifunctional performance 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 by an external voltage. Since the fermi energy is changed by changing the bias voltage, graphene has more than a noble metalLarge dynamic tuning potential. Phase change materials have interesting properties, such as the switchable phenomenon from dielectric to metal, and we are able to control the dielectric constant and conductivity of phase change materials under electrical, optical or thermal excitation. Vanadium dioxide (VO) 2 ) As a phase change material, much attention has been paid due to its low phase transition temperature (340K).
With the development of micro-nano integrated optics, miniaturization and multi-functionalization are worthy of research. Most of the current research focuses on realizing a certain function, which obviously reduces the use efficiency of the metamaterial, so that it is of far-reaching significance to research how to realize multiple functions on one structure. There have been studies on multifunctional devices, such as the first literature (Z.Song and B.Zhang, "Controlling wireless and electrically induced transmissive via a phase change material," Europhys. Lett.129,57003(2020)) and the second literature (H.Li and J.Yu, "Bifunctional terrestrial adhesive with a communicating and switching performance between a transmitting and a reducing-base," Opt.express 28,25225-25237(2020)) based on VO 2 Switching between the two functions is achieved. But neither function can be dynamically tunable, which reduces convenience and adaptability in practical applications.
The invention discloses a double-function device for realizing electromagnetic induction transparency and perfect absorption. When VO is generated 2 When the graphene is an insulator, the device can realize the electromagnetic induction transparency effect by changing the Fermi level and VO of graphene 2 The conductivity of the transparent peak respectively realizes the modulation of the frequency shift and the transmissivity of the transparent peak; when VO is present 2 When the metal is adopted, the device is changed into a perfect absorber, two perfect absorption peaks are generated in a terahertz range, and the frequency shift and modulation of the absorption peaks are realized by changing the Fermi level of the graphene. Compared with the previous research, the invention can realize the dynamic tuning of the two functions while realizing the switchable of the two functions, expands the application range of the device, has simple structure and is easy to integrate.
Disclosure of Invention
The invention aims to provide a bifunctional device for realizing electromagnetic induction transparency and perfect absorption, which has the advantages of dynamic tunability, easy integration and the like.
The purpose of the invention is realized as follows:
the invention provides a double-function device for realizing electromagnetic induction transparency and perfect absorption, which is basically characterized in that: the graphene/vanadium dioxide composite material is composed of a vanadium dioxide substrate 1, silicon dioxide 2, a graphene split ring 3 and a graphene strip 4, wherein the opening angle of the graphene split ring is alpha, the graphene strip is inserted into the split ring along the long axis direction, the graphene strip is not in contact with the inner side of the split ring, the separation distance is d, and the plasma resonance frequency of the graphene split ring and the plasma resonance frequency of the graphene strip are close to each other.
Relative dielectric constant of silicon dioxide is set to 3.9, VO 2 The relative dielectric constant of (a) can be calculated by Drude model:
setting the electric field direction of incident light to be parallel to the long axis direction of the graphene strip, adjusting the conductivity of vanadium dioxide to enable the vanadium dioxide to be represented as an insulator, exciting plasmon resonance of a graphene split ring and the graphene strip by incident electromagnetic waves, generating destructive interference, leading a transparent window to appear between two plasmon resonance frequencies, namely, electromagnetically inducing transparent effect, and changing the Fermi level E of the graphene by changing the Fermi level E of the graphene F Realize the adjustment of transparent window and group delay and increase VO 2 The conductivity of (a) enables modulation of the transparency peaks.
Adjusting the conductivity of vanadium dioxide to make the vanadium dioxide show metallicity can realize perfect absorption at the plasmon resonance frequency of the graphene open ring and the graphene strip, and change E F The frequency shift of the absorption peak can also be controlled.
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 perfect absorption of double bands can be realized, and the absorption peak can be dynamically adjusted; 3. the two functions can be dynamically switched, and the electromagnetic induction transparent on and off can be realized; 4. the method can be used for optical switches, slow light devices, modulators, perfect absorbers and the like.
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FIG. 1 is an example: a schematic diagram of a dual-function device unit structure for realizing electromagnetic induction transparency and perfect absorption. The graphene oxide film is composed of vanadium dioxide 1, silicon dioxide 2, a graphene split ring 3 and a graphene strip.
FIG. 2 is an example: a top view of a dual function device cell structure that achieves electromagnetically induced transparency and perfect absorption. l 1 And W 1 Respectively represent the length and width of the graphene strip, R and W 2 Respectively representing the outer diameter of the graphene split ring and the width of the ring, and d representing the coupling distance between the graphene split ring and the graphene strip.
FIG. 3 shows an example: an array diagram of a plane where a basic unit structure of a bifunctional device for realizing electromagnetic induction transparency and perfect absorption is located, wherein the direction of an incident electric field is parallel to the long axis direction of a graphene strip.
FIG. 4 is an example: when sigma is 10S/m, the electromagnetic induction transparency effect is changed along with the change of the Fermi level of the graphene.
FIG. 5 is an example: when the sigma is 10S/m, the group delay of the electromagnetic induction transparency effect is changed along with the Fermi level of the graphene.
FIG. 6 is an example: e F When the dielectric constant is 0.3eV, the electromagnetically induced transparency effect is VO 2 A change in conductivity.
FIG. 7 is an example: and when the sigma is 200000S/m, the perfect absorption function is changed along with the Fermi level of the graphene.
FIG. 8 is an example: e F The perfect absorption function varies with different angles of incidence at 1.2 eV.
Detailed Description
The invention is further illustrated below with reference to specific examples.
The specific embodiment is as follows: a dual-function device for realizing electromagnetic induction transparency and perfect absorption is shown in figures 1 and 3 and is of an array structure, a unit structure takes vanadium dioxide as a substrate, silicon dioxide as a dielectric layer, a graphene split ring and a graphene strip are of resonance structures, the two structures have similar plasma resonance frequencies, and the direction of an incident electric field is parallel to the long axis direction of the graphene strip.
As shown in fig. 2, the opening angle α of the graphene snap ring is 90 °, the outer diameter R thereof is 2.4 μm, and the width W thereof is 2 0.9 μm; the length l of the graphene strip is 3 mu m, and the width W of the graphene strip 1 ＝0.8μm。
Preferably, the unit structure period is 6 μm, the thickness of vanadium dioxide is 0.8 μm, and the thickness of silicon dioxide is 4 μm.
As shown in fig. 4 and 5, when E F When increasing from 0.2eV to 0.5eV, the transmission peak blue-shifts and the transmittance decreases, the corresponding group delay gradually increases, indicating that E can be varied F And dynamic adjustment of the electromagnetic induction transparent effect is realized.
FIG. 6 shows E F At 0.3eV, the effect of different σ on electromagnetically induced transparency effect: VO with increasing σ 2 The transition from insulator to metal is gradual, the transmittance is reduced, and the frequency corresponding to the transmission peak is not changed, so that the dynamic modulation of the electromagnetic induction transparency effect can be realized by changing the sigma.
VO is shown in FIGS. 7 and 8 2 For metals, i.e., σ ═ 200000S/m, the perfect absorption function of the device: with E F Increasing from 0.8eV to 1.2eV, the two absorption peaks gradually rise to achieve perfect absorption, and the different angles of incidence have little effect on absorption, indicating dynamic tuning of the perfect absorption function and insensitivity to the angle of incidence.
In conclusion, the invention can realize the switching between the electromagnetic induction transparent effect and the perfect absorption, can realize dynamic modulation under both functions, and has positive effect on the research of integrated multifunctional devices.
Claims (6)
1. A dual-function device for realizing electromagnetic induction transparency and perfect absorption is in an array structure on the plane of a basic unit structure, and the basic unit structure is characterized in that: the vanadium dioxide sensor is composed of a vanadium dioxide substrate 1, silicon dioxide 2, a graphene split ring 3 and a graphene strip 4, wherein the opening angle of the graphene split ring is alpha, the graphene strip is inserted into the split ring along the long axis direction, is not in contact with the inner side of the split ring, is separated by a distance d, the plasma resonance frequencies of the graphene split ring and the graphene strip are close to each other, the plasmon resonance of the graphene split ring and the graphene strip can be excited in the direction that the electric field direction of incident light is parallel to the long axis direction of the graphene strip, the conductivity of vanadium dioxide is adjusted to enable the vanadium dioxide to be represented as an insulator, and a transparent peak can appear between the two plasmon resonance frequencies, namely an electromagnetic induction transparent effect; adjusting the conductivity of vanadium dioxide to appear metallic, perfect absorption is achieved at the plasmon resonance frequency.
2. A dual function device for achieving electromagnetically induced transparency and perfect absorption as claimed in claim 1, wherein: the opening angle alpha of the graphene split ring is 90 degrees, the outer diameter R is 2.4 mu m, and the width W is 2 0.9 μm; the length l of the graphene strip is 3 mu m, and the width W of the graphene strip 1 ＝0.8μm。
3. A dual function device for achieving electromagnetically induced transparency and perfect absorption as claimed in claim 1, wherein: the unit structure period was 6 μm, the vanadium dioxide thickness was 0.8 μm, the silicon dioxide thickness was 4 μm, and the relative dielectric constant was 3.9.
4. A dual function device for achieving electromagnetically induced transparency and perfect absorption as claimed in claim 1, wherein: when the vanadium dioxide is an insulator, the structure can realize the electromagnetic induction transparent effect, and the Fermi level of the graphene and the conductivity of the vanadium dioxide are adjusted to realize the functions of adjusting and modulating the transparent window and the group delay.
5. A dual function device for achieving electromagnetically induced transparency and perfect absorption as claimed in claim 1, wherein: when the vanadium dioxide is shown to be metallic, the structure can realize a perfect absorption function of dual frequency bands, and an absorption peak can be tuned by controlling the Fermi level of graphene.
6. A bifunctional device for achieving electromagnetically induced transparency and perfect absorption as claimed in claim 1, wherein: when the perfect absorption function of the dual-band is realized, the dual-band optical fiber is insensitive to the incident angle of 0-70 degrees.
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