CN214898884U - Adjustable ultra-wideband terahertz absorber based on metal and graphene - Google Patents
Adjustable ultra-wideband terahertz absorber based on metal and graphene Download PDFInfo
- Publication number
- CN214898884U CN214898884U CN202120893959.8U CN202120893959U CN214898884U CN 214898884 U CN214898884 U CN 214898884U CN 202120893959 U CN202120893959 U CN 202120893959U CN 214898884 U CN214898884 U CN 214898884U
- Authority
- CN
- China
- Prior art keywords
- graphene
- layer
- metal
- dielectric layer
- ring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Aerials With Secondary Devices (AREA)
Abstract
The utility model relates to a wave-absorbing device field specifically is based on adjustable and controllable ultra wide band terahertz absorber of metal and graphite alkene, and it includes by lower supreme ideal electric conductor layer, dielectric layer and the bimetal ring that sets gradually, sets up graphite alkene layer in the dielectric layer, and the bimetal ring comprises endocentric first metal ring and second metal ring. The surface conductivity of the graphene changes along with the Fermi level, and when the chemical potential of the graphene is changed, the utility model can realize the adjustability of the broadband, thereby achieving the purpose of tunable absorption; the utility model discloses combine bimetal ring and graphite alkene layer to design a metamaterial wave absorber, make it not only have the high absorption rate of the metamaterial wave absorber of metal, have the regulation and control characteristic of graphite alkene metamaterial again, have the high absorptive characteristic of broadband. The utility model discloses simple structure, through the ratio transformation of size, the electromagnetic wave absorption of other wave bands also can be realized.
Description
Technical Field
The utility model relates to an inhale the ripples ware field, specifically be based on metal and graphite alkene can regulate and control ultra wide band terahertz absorber.
Background
The metamaterial has electromagnetic properties superior to those of natural materials, is a new material which has the most influence after high polymer materials and nano materials, is the basis for realizing optical devices such as a perfect lens, a negative refractive index and the like, and is also widely concerned by experts in the fields of stealth, communication and the like due to feasibility. However, the perfect wave absorber is an important branch of the metamaterial. Since Landy et al first proposed a thin and nearly perfect wave-absorbing metamaterial in 2008, Metamaterial Absorbers (MAs) began to develop vigorously. Because it is difficult to find a strong frequency selectivity terahertz absorber, MAs is focused on the terahertz band.
Terahertz is 0.1GHz-10THz, has high frequency, short pulse, high time-domain spectrum signal to noise ratio, low photon energy and strong penetrability, and has little damage to substances and human bodies, so compared with X-rays, the terahertz imaging technology has more advantages, and the unique property has wide prospects in the aspects of medical imaging, safety inspection, broadband communication and the like. Therefore, the development and research of functional devices related to the terahertz waveband are of great significance. In the terahertz waveband, the graphene electromagnetic wave supports Surface plasmons (SPPs), so that the graphene-based metamaterial is expected to be a candidate material for perfectly absorbing terahertz waves. More importantly, compared with the traditional metal metamaterial structure, the surface conductivity of the graphene is changed along with the Fermi level, and dynamic adjustment can be realized by applying bias voltage, chemical doping or external electric field and magnetic field, so that the purpose of tunable absorption is achieved. However, the higher the fermi level of graphene is, the higher the required applied bias voltage is, the effect of high absorption and high modulation depth cannot be obtained only by using the property of graphene, and most wave absorbers based on graphene metamaterials have the problem of narrow bandwidth.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is that current wave-absorbing device can't obtain the effect of high absorption, high modulation degree of depth, and has the narrower problem of bandwidth, in order to solve this problem, the utility model provides a can regulate and control ultra wide band terahertz absorber based on metal and graphite alkene, it can realize the broadband adjustability to reach tunable absorptive purpose, still have the high absorptive characteristic of broadband.
The utility model discloses an content is for can regulating and control ultra wide band terahertz absorber based on metal and graphite alkene, include by lower supreme ideal electric conductor layer, dielectric layer and the bimetal ring that sets gradually, set up graphite alkene layer in the dielectric layer, bimetal ring comprises endocentric first metal ring and second metal ring.
Furthermore, the dielectric layer comprises a first dielectric layer and a second dielectric layer, the first dielectric layer is contacted with the ideal electric conductor layer, the second dielectric layer is contacted with the bimetal ring, and the graphene layer is positioned between the first dielectric layer and the second dielectric layer.
Furthermore, the graphene layer has a square first graphene layer and four strip-shaped second graphene layers.
Further, the one end of the second graphite alkene layer of four rectangular shapes all be connected with first graphite alkene layer, the other end terminal surface of the second graphite alkene layer of four rectangular shapes all with the outward flange parallel and level of dielectric layer.
Further, the center of the ideal electric conductor layer, the center of the dielectric layer, the center of the graphene layer and the center of the bimetal ring are positioned on the same vertical straight line.
Further, the dielectric layer is silicon dioxide or other dielectric materials with the loss tangent less than 0.01 in the terahertz waveband.
Furthermore, the ideal electric conductor layer and the dielectric layer are both provided with a side length L518-22 mu m square, and the thickness H of the dielectric layer18-12 μm, thickness H of graphene layer3＝0.34～0.5nm。
Further, the thickness H of the second dielectric layer2＝2～4μm。
Furthermore, the radius R of the first metal ring15.5 to 7 μm, ring width L30.15-0.25 μm, radius R of the second metal ring24-5 μm, ring width L30.45-0.55 μm, and the thickness H of the first metal ring and the second metal ring4＝0.05～0.15μm。
Further, the side length L of the first graphene layer1A width L of the second graphene layer of 9-11 μm2＝1.5～2μm。
The utility model has the advantages that the surface conductivity of the graphene changes along with the Fermi energy level, and when the chemical potential of the graphene is changed, the utility model can realize the adjustability of the broadband, thereby achieving the purpose of tunable absorption; the utility model discloses combine bimetal ring and graphite alkene layer to design a metamaterial wave absorber, make it not only have the high absorption rate of the metamaterial wave absorber of metal, have the regulation and control characteristic of graphite alkene metamaterial again, have the high absorptive characteristic of broadband. The utility model discloses simple structure, through the ratio transformation of size, the electromagnetic wave absorption of other wave bands also can be realized. The utility model discloses still have advantages such as ultra wide band, miniaturized manufacturing and adjustable degree of freedom, have important application prospect in aspects such as sensing, optical communication, survey, optical device, verified metal and the mixed wave absorber superiority of graphite alkene.
Drawings
Since the thickness of the graphene layer is greatly different from those of other components, the thickness of the graphene layer is exaggerated in the following drawings.
FIG. 1 is a front view of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a perspective view of the present invention;
FIG. 4 is an exploded view of FIG. 3;
fig. 5 is a schematic diagram of a graphene layer structure according to the present invention;
fig. 6 is a spectrogram of the present invention at normal incidence, wherein a is the absorption broadband response line, R is the reflection broadband response line, and T is the transmission broadband response line, which is located at the bottom and coincides with the bottom border.
In the figure, 1 is an ideal electric conductor layer 2, a first metal ring 3, a second metal ring 4, a first dielectric layer 5, a second dielectric layer 6, a first graphene layer 7 and a second graphene layer.
Detailed Description
As shown in the attached drawings 1-4, the adjustable ultra-wideband terahertz absorber based on metal and graphene comprises an ideal electric conductor layer 1, a dielectric layer and a bimetal ring which are sequentially arranged from bottom to top, wherein the graphene layer is arranged in the dielectric layer, and the bimetal ring is composed of a first metal ring 2 and a second metal ring 3 which are concentric. The bimetal ring and the graphene layer are both constructed on the dielectric layer. The incident wave can not reach the medium layer, so the absorption characteristic is not influenced. The surface conductivity of the graphene changes along with the Fermi level, and when the chemical potential of the graphene is changed, the utility model can realize the adjustability of the broadband, thereby achieving the purpose of tunable absorption; the utility model discloses combine bimetal ring and graphite alkene layer to design a metamaterial wave absorber, make it not only have the high absorption rate of the metamaterial wave absorber of metal, have the regulation and control characteristic of graphite alkene metamaterial again, have the high absorptive characteristic of broadband. The utility model discloses simple structure, through the ratio transformation of size, the electromagnetic wave absorption of other wave bands also can be realized. The utility model discloses still have advantages such as ultra wide band, miniaturized manufacturing and adjustable degree of freedom, have important application prospect in aspects such as sensing, optical communication, survey, optical device, verified metal and the mixed wave absorber superiority of graphite alkene.
As shown in fig. 1-4, the dielectric layer has a first dielectric layer 4 and a second dielectric layer 5, the first dielectric layer 4 contacts with the ideal electric conductor layer 1, the second dielectric layer 5 contacts with the bimetal ring, and the graphene layer is located between the first dielectric layer 4 and the second dielectric layer 5. Such a structure can facilitate the placement of graphene layers into the dielectric layer.
As shown in fig. 4 and 5, the graphene layer has a square first graphene layer 6 and four strip-shaped second graphene layers 7. The structure utilizes the plasma hybridization effect among the bandwidths of the graphene cross shape, and further expands the bandwidth.
As shown in fig. 1, fig. 3, fig. 4, and fig. 5, one end of each of the four elongated second graphene layers 7 is connected to the first graphene layer 6, and the other end faces of the four elongated second graphene layers 7 are flush with the outer edge of the medium layer.
As shown in fig. 3 and 4, the center of the ideal electric conductor layer 1, the center of the dielectric layer, the center of the graphene layer and the center of the bimetal ring are located on the same vertical straight line.
The dielectric layer is made of silicon dioxide or other dielectric materials with the loss tangent less than 0.01 in the terahertz waveband. The dielectric constant of the dielectric layer is 2.88.
Since graphene is transparent, in order to obtain high absorption rate according to the mutual effect of adjacent unit cells, as shown in fig. 1 and 2, the ideal electric conductor layer 1 and the dielectric layer have a side length L518-22 mu m square, and the thickness H of the dielectric layer18-10 μm, thickness H of graphene layer30.34-0.5 nm. The ideal electric conductor layer 1 and the dielectric layer are both side length L518 μm square, thickness H of the dielectric layer1Thickness H of graphene layer 8 μm30.34 nm. The ideal electrical conductor layer 1 and the dielectric layer may also both have a side length L522 μm square, thickness H of the dielectric layer1Thickness H of graphene layer 10 μm30.45 nm. Preferably, the ideal electric conductor layer 1 and the dielectric layer have a side length L5Thickness H of dielectric layer as 20 μm square1Thickness H of graphene layer ═ 9.5 μm30.5nm, corresponding to a fermi level of 0.72 eV.
As shown in fig. 1, the thickness H of the second dielectric layer 522-4 μm. The thickness H of the second dielectric layer 52May be 2 μm. The thickness H of the second dielectric layer 52It may be 4 μm. Preferred thickness H of the second dielectric layer 52＝3.5μm。
As shown in figures 1 and 2 of the drawings,the radius R of the first metal ring 215.5 to 7 μm, ring width L30.15 to 0.25 μm, radius R of the second metal ring 324-5 μm, ring width L30.45-0.55 μm, thickness H of the first metal ring 2 and the second metal ring 340.05 to 0.15 μm. The radius R of the first metal ring 21Can be 5.5 μm, ring width L3May be 0.15 μm, radius R of the second metal ring 32Can be 4 μm, and has a ring width L3Can be 0.45 μm, the thickness H of the first metal ring 2 and the second metal ring 34May be 0.05 μm. The radius R of the first metal ring 21Can also be 7 μm, ring width L3May be 0.25 μm, radius R of the second metal ring 32Can be 5 μm, ring width L3Can be 0.55 μm, the thickness H of the first metal ring 2 and the second metal ring 34May be 0.15 μm. Radius R of the first circular metal ring 216.5 μm, ring width L30.2 μm, radius R of the second metal ring 324.5 μm, ring width L30.5 μm, thickness H of the first metal ring 2 and the second metal ring 340.1 μm. The metal model used in the simulation of this experiment was Brendel-Bormann model.
As shown in fig. 5, the side length L of the first graphene layer 61A width L of the second graphene layer 7 of 9-11 μm21.5 to 2 μm. The side length L of the first graphene layer 61May be 9 μm, the width L of the second graphene layer 72May be 1.5 μm. The side length L of the first graphene layer 61It may also be 11 μm, the width L of the second graphene layer 72It may be 1.8 μm. Preferably, the side length L of the first graphene layer 61Width L of the second graphene layer 7 of 10 μm2＝2μm。
The utility model discloses a bias voltage ion-gel top grid dielectric changes the resonant amplitude of graphite alkene fermi energy level control electromagnetic wave, and metal and graphite alkene super surface can realize the broadband high absorption in this kind of structure. Electromagnetic simulation software simulation response frequency based on finite element method, the utility model realizes more than 80% in 2.68THz-7.48THzAbsorption rate, center frequency fc5.08THz, relative bandwidth 94.5%. The polarization angle (phi) is tuned from 0 to 90 degrees, and the polarization insensitivity of the utility model is proved; from 0 to 45 big-angle oblique incidence, it is unanimous basically to TE and TM polarization absorption mode, the utility model has the advantages of ultra wide band, miniaturized manufacturing and adjustable degree of freedom.
The conductivity of graphene is provided by the secular equation, which determines both the in-band and inter-band transitions from both.
σg(ω,μc,τ,T)＝σintra+σinter
In the terahertz wave band, when Ef>>2kBAnd in T, mainly the intra-band transition contributes, and the inter-band transition of the conductivity of the graphene is ignored, so that the conductivity is simplified as follows:
it can be known that KBIs the boltzmann constant of the signal,
simplified Plabck constant, h is the Plabck constant, T is the Kelvin temperature, ω angular frequency, e charge, μc＝104cm2Graphene fermi level E ═ VfVelocity vf＝106m/s, relaxation time
εOIs the dielectric constant of a vacuum,. epsilondIs the relative dielectric constant, ε, of the dielectric layerrC is the speed of light in vacuum, the dielectric constant on the graphene layer.
The theory fully shows that the wave-absorbing material is dynamically adjusted by applying bias voltage or chemical doping, so that the aim of tunable absorption is fulfilled, and the process qualitatively changes the frequency of the surface plasmon excitation characteristic, so that the working frequency of the wave-absorbing material is influenced. In the simulation, with one cell in the periodic structure as the calculation object, the periodic cell boundary condition in the X, Y direction is selected, the Z direction is set as the open boundary condition, and the absorption rate is known from the corresponding S parameter:
A(ω)＝1-T(ω)-R(ω)
wherein T (omega) and R (omega) are respectively a transmission coefficient and a reflection coefficient, and a frequency domain solver is selected to derive the absorptivity. As can be seen from the above equation, by reducing the transmission and reflection coefficients, a higher absorption spectrum can be obtained.
FIG. 6 shows the present invention at EfAbsorption spectrum in TE polarization at 0.72 eV. As can be seen from the absorption spectrum, the absorption bandwidth of TE polarization is in the range of 2.68-7.48THz ()>80%) of the absorption rate, wherein the center frequency fc5.08THz, using Δ f ═ fcThe relative bandwidth is calculated as 94.5%, as shown at a in fig. 6. As a symmetrical structure, the reflection R (ω) tends to almost 0, and the reflection is extremely small in a relatively large bandwidth, so that the total reflection of the incident wave is small and most of the reflected wave is consumed by the incident wave, as shown by R in fig. 6. The ideal electrical conductor is used as a metal film reflector to ground to minimize transmission coefficient. The results show that the transmission coefficient of the metal layer is 0, i.e., a (ω) is 1-R (ω), as shown by T in fig. 6.
In order to test the utility model discloses a performance, to absorption spectrum's influence when having studied dielectric layer and the different thickness of second dielectric layer 5. Simulation knotIt is shown that when the thickness H of the dielectric layer is larger1Thickness H of the second dielectric layer 5 ═ 9.5 μm2When the particle size is 3.5 μm, the best absorption performance can be obtained. According to the thickness H of the dielectric layer1The absorption bandwidth gradually decreases. When the thickness H of the dielectric layer1When the thickness exceeds 10 μm, the absorption rate of the 6THz-7THz band is gradually reduced, and the absorption effect of the 9-10 μm band is the best. And the thickness H of the second dielectric layer 52The influence on the absorption rate is not great. Experiments show that the thickness H of the second dielectric layer 52The absorption efficiency and bandwidth at 3.5 μm are best. Through the thickness of experimental analysis dielectric layer and second dielectric layer 5, the dielectric layer parameter between the metal-graphite alkene metamaterial is right the utility model discloses an absorption characteristic is very important. Graphite alkene has changed the unchangeable current situation of metal characteristic after the structure is fixed as can regulate and control the material, realizes dynamic adjustment through applying bias voltage, makes the utility model discloses there is bigger degree of freedom. By adjusting the chemical potential of the graphene super-surface, the absorption bandwidth of the proposed absorber can be further modulated. The resonance frequency is slightly increased along with the adjustment of the Fermi level, the absorption effect is better and better, and after the Fermi level is adjusted to be 0.1eV-1eV, the position of an absorption resonance peak is widened, so that the absorption is more effective. When the chemical potential was changed from 0.1eV to 0.7eV, the absorption of 2THz-3THz and 7THz-8THz was significantly increased to 80%, with the absorption effect being the best at 0.72 eV. By numerical simulation using simulation software, the absorption of the tuning polarization angle (Φ) from 0 to 90 ° remains unchanged for the TE and TM modes. The result shows, because the utility model discloses a wave-absorbing structure is symmetrical structure, under the normal incidence condition, the absorptivity is completely irrelevant with the polarization, and this wave-absorbing structure is insensitive to the angle of polarization promptly. In practical application, the incident light is usually irradiated at an oblique incident angle, the utility model discloses simulation oblique incident angle is from 0 to 45 degrees, and is basically kept the same for TE and TM polarization absorption modes. The simulation result shows that the structure of the utility model is highly optimized TE and TM polarized waves with large-angle incidence, and has good absorption performance and stable working bandwidth. To sum up, the utility model provides a super surface terahertz absorber based on metal and graphite alkene hybrid resonator realize ultra wide band, ultra-thin, can regulate and control. The utility model is at 2.68THz-7.Realized in 48THz range (>80%) of the absorption rate, wherein the center frequency fcThe relative bandwidth is 94.5% under 5.08THz, the physical mechanism of the wave absorber is analyzed by utilizing the electric field of surface plasmon resonance, the super surface field is enhanced by hybridization of metal and graphene patterns, and the design structure shows geometric symmetry, so that the polarization angle and large-angle incidence have good advantages. The Fermi level of the graphene is changed by adjusting the bias voltage, so that the absorption strength and the resonant frequency of the metamaterial can be effectively controlled, and the dynamic tuning of the metamaterial absorber is realized.
Claims (10)
1. Adjustable ultra wide band terahertz absorber based on metal and graphite alkene, its characterized in that: the graphene-based bimetallic conductor comprises an ideal conductor layer (1), a dielectric layer and a bimetallic ring which are sequentially arranged from bottom to top, wherein a graphene layer is arranged in the dielectric layer, and the bimetallic ring is composed of a first metal ring (2) and a second metal ring (3) which are concentric.
2. The tunable ultra-wideband terahertz absorber based on metal and graphene of claim 1, wherein: the dielectric layer comprises a first dielectric layer (4) and a second dielectric layer (5), the first dielectric layer (4) is contacted with the ideal electric conductor layer (1), the second dielectric layer (5) is contacted with the bimetal ring, and the graphene layer is positioned between the first dielectric layer (4) and the second dielectric layer (5).
3. The tunable ultra-wideband terahertz absorber based on metal and graphene of claim 1 or 2, wherein: the graphene layer has a first graphene layer (6) with a square shape and four second graphene layers (7) with a strip shape.
4. The tunable ultra-wideband terahertz absorber based on metal and graphene of claim 3, wherein: one end of each of the four strip-shaped second graphene layers (7) is connected with the first graphene layer (6), and the other end faces of the four strip-shaped second graphene layers (7) are flush with the outer edge of the medium layer.
5. The tunable ultra-wideband terahertz absorber based on metal and graphene of claim 3, wherein: the center of the ideal electric conductor layer (1), the center of the dielectric layer, the center of the graphene layer and the center of the bimetal ring are positioned on the same vertical straight line.
6. The tunable ultra-wideband terahertz absorber based on metal and graphene of claim 1, wherein: the dielectric layer is made of silicon dioxide or other dielectric materials with the loss tangent less than 0.01 in the terahertz waveband.
7. The tunable ultra-wideband terahertz absorber based on metal and graphene of claim 1 or 2, wherein: the ideal electric conductor layer (1) and the dielectric layer are both square with the side length L5= 18-22 μm, the thickness H1= 8-10 μm of the dielectric layer, and the thickness H3= 0.34-0.5 nm of the graphene layer.
8. The tunable ultra-wideband terahertz absorber based on metal and graphene of claim 2, wherein: the thickness H2 of the second dielectric layer (5) is = 2-4 μm.
9. The tunable ultra-wideband terahertz absorber based on metal and graphene of claim 1, wherein: the radius R1 of the first metal ring (2) is = 5.5-7 μm, the ring width L3 is = 0.15-0.25 μm, the radius R2 of the second metal ring (3) is = 4-5 μm, the ring width L3 is = 0.45-0.55 μm, and the thickness H4 of the first metal ring (2) and the second metal ring (3) is = 0.05-0.15 μm.
10. The tunable ultra-wideband terahertz absorber based on metal and graphene of claim 4, wherein: the length of a side L1= 9-11 μm of the first graphene layer (6), and the width L2= 1.5-2 μm of the second graphene layer (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120893959.8U CN214898884U (en) | 2021-04-27 | 2021-04-27 | Adjustable ultra-wideband terahertz absorber based on metal and graphene |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120893959.8U CN214898884U (en) | 2021-04-27 | 2021-04-27 | Adjustable ultra-wideband terahertz absorber based on metal and graphene |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214898884U true CN214898884U (en) | 2021-11-26 |
Family
ID=78947480
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120893959.8U Active CN214898884U (en) | 2021-04-27 | 2021-04-27 | Adjustable ultra-wideband terahertz absorber based on metal and graphene |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214898884U (en) |
-
2021
- 2021-04-27 CN CN202120893959.8U patent/CN214898884U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Wu et al. | A four-band and polarization-independent BDS-based tunable absorber with high refractive index sensitivity | |
| CN110441842B (en) | Based on VO2And multifunctional device made of graphene mixed metamaterial | |
| Li et al. | Polarization independent tunable bandwidth absorber based on single-layer graphene | |
| CN113161758A (en) | Adjustable ultra-wideband terahertz absorber based on metal and graphene | |
| CN113078474B (en) | Graphene-vanadium dioxide metamaterial absorber and tunable terahertz device | |
| CN106405697B (en) | Dynamically adjustable multi-frequency electromagnetic wave-absorbing material | |
| CN211123332U (en) | Graphene-based broadband adjustable terahertz wave absorber | |
| CN108183340A (en) | The adjustable wave absorbing device of broadband electricity based on the double annulus of graphene | |
| CN113809544B (en) | Gallium arsenide/graphene composite metamaterial terahertz broadband absorber | |
| Li et al. | Polarization-sensitive multi-frequency switches and high-performance slow light based on quadruple plasmon-induced transparency in a patterned graphene-based terahertz metamaterial | |
| CN110120591A (en) | One kind being based on the super adjustable wave absorbing device of surface micro-structure high efficiency of graphene | |
| CN110658571A (en) | Graphene-based broadband adjustable terahertz wave absorber | |
| Xiao et al. | A flexible and ultra-broadband terahertz wave absorber based on graphene–vertically aligned carbon nanotube hybrids | |
| Pan et al. | Recent progress in two-dimensional materials for terahertz protection | |
| CN111796437A (en) | Terahertz wave electronic control modulation method based on Dirac semimetal microstructure | |
| CN207834582U (en) | A kind of polarization based on graphene multi-resonant does not depend on broadband Terahertz wave absorbing device | |
| Liu et al. | A compact metamaterial broadband THz absorber consists of graphene crosses with different sizes | |
| Ding et al. | Ultra-broadband tunable terahertz absorber based on graphene metasurface with multi-square rings | |
| Xue et al. | A high-performance terahertz absorber based on synthetic-patterned vanadium dioxide metamaterials | |
| Zhu et al. | A Phase Transition Oxide/Graphene Interface for Incident‐Angle‐Agile, Ultrabroadband, and Deep THz Modulation | |
| Chen et al. | A dual ultra-broadband switchable high-performance terahertz absorber based on hybrid graphene and vanadium dioxide | |
| Zhang et al. | A tunable ultra-wideband cross-polarization conversion based on the band splicing technology | |
| CN109638471B (en) | Adjustable two-frequency-band THz absorber based on Fermi Dirac material | |
| Gupta et al. | Tunability in graphene based metamaterial absorber structures in mid-infrared region | |
| CN214898884U (en) | Adjustable ultra-wideband terahertz absorber based on metal and graphene |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |