CN220895858U - High-chirality adjustable terahertz wave absorber based on perovskite material super surface - Google Patents
High-chirality adjustable terahertz wave absorber based on perovskite material super surface Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 24
- 239000006096 absorbing agent Substances 0.000 title claims abstract description 12
- 239000010931 gold Substances 0.000 claims description 6
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 5
- 229910052737 gold Inorganic materials 0.000 claims description 5
- 239000002210 silicon-based material Substances 0.000 claims description 3
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- 229910052710 silicon Inorganic materials 0.000 description 4
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Abstract
The utility model provides a high-chirality adjustable terahertz wave absorber based on a perovskite material super-surface, which is used for solving the technical problems that the super-surface with high chiral response value is relatively complex, has higher cost and lacks a polarization detection function in the prior design; the chiral super-surface comprises a chiral super-surface, wherein the chiral super-surface consists of periodically arranged structural units; the structural unit comprises a bottom layer lossy layer and a perovskite layer, wherein the edges of the bottom layer lossy layer and the perovskite layer are mutually overlapped, and a middle lossy layer is arranged between the bottom layer lossy layer and the perovskite layer; the shape of the middle lossy layer is the number "17". The perovskite material with excellent intrinsic structure and anisotropic characteristic is selected, so that the chiral super-surface structure is simple, easy to manufacture and low in cost, and meanwhile, the high CD response value (0-0.47) can be regulated and controlled.
Description
Technical Field
The utility model relates to the technical field of terahertz wave application, in particular to a high-chirality adjustable terahertz wave absorber based on a perovskite material super surface.
Background
In recent years, chiral optical supersurfaces with unique optical chirality have been rapidly developed in the fields of biosensing, polarization control, polarization sensitive imaging, and the like. In order to achieve spin resolution and high chiral response values, various countermeasures have been taken. However, the designed super surface is relatively complex and lacks a polarization detection function. Therefore, it is of great importance to develop a high chiral response and a simple super-surface structure with a full stokes polarization detection function. Perovskite is one of the most promising candidate materials for high stability photovoltaic devices due to its large light absorption coefficient, tunable band gap and high carrier mobility. In addition, perovskite has excellent intrinsic structure and anisotropic characteristics, and has been demonstrated to have a large chiral response. By changing the anisotropy and photoelectric properties of the perovskite, the terahertz chiral response can be flexibly controlled.
Circular dichroism refers to the difference in absorbance of left-hand polarized light and right-hand polarized light. The utility model provides a high terahertz chiral response chiral super surface with a simple structure based on perovskite (including but not limited to MAPbI 3); high circular dichroism (0-0.47) can be tuned by varying perovskite thickness, supersurface geometric phase and conductivity, and calculates the full Stokes parameter at 0.1THz elliptical polarization. The work provides a new method for realizing the high-performance polarization detection technology.
Disclosure of Invention
Aiming at the technical problems that the super surface with high chiral response value designed at present is relatively complex, the cost is high and the polarization detection function is lacked, the utility model provides a high-chiral adjustable terahertz wave absorber based on the super surface of perovskite material and a preparation method thereof, and the adjustable high circular dichroism value (0-0.47) about 0.1THz is realized.
The technical scheme of the utility model is realized as follows:
A high-chirality adjustable terahertz wave absorber based on a perovskite material super surface comprises a chiral super surface, wherein the chiral super surface is composed of periodically arranged structural units; the structural unit comprises a bottom layer lossy layer and a perovskite layer, wherein the edges of the bottom layer lossy layer and the perovskite layer are mutually overlapped, and a middle lossy layer (2) is arranged between the bottom layer lossy layer and the perovskite layer; the shape of the middle lossy layer is the number "17".
Preferably, the bottom lossy layer is made of a lossy silicon material, the middle lossy layer is made of a lossy gold material, and the perovskite layer is made of a material including MAPbI 3.
Preferably, the structural units have a length px=2000 μm and a width py=1500 μm; the thickness of the bottom lossy layer is h3=300 μm, the thickness of the middle lossy layer is h2=1 μm, and the thickness of the perovskite layer is h1=1 μm.
Preferably, in the middle lossy layer, the width of each of the numbers "1" and "7" is 200 μm, and the shortest distance of the numbers "1" and "7" is 50 μm.
Compared with the prior art, the utility model has the beneficial effects that:
According to the utility model, perovskite (including but not limited to MAPbI 3) materials with excellent intrinsic structures and anisotropic characteristics are selected, so that the chiral super-surface structure of the design is simple, easy to manufacture and low in cost, and meanwhile, the high CD response value (0-0.47) can be regulated and controlled.
The present utility model begins with varying the three aspects of perovskite (including but not limited to MAPbI 3) material thickness, subsurface geometry phase and conductivity, and the CD value changes are calculated and analyzed.
The utility model adopts the relationship between the change of the incident angle and the absorption of circularly polarized light under the Full Stokes verification ellipsoid state; stokes vector parameters in elliptical polarization states under different input polarizations were tested and analyzed by introducing a Poincare sphere model. The method provides a new idea for the field of polarization detection function.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a periodic unit structure according to the present utility model.
Fig. 2 is a plan view showing the internal structure of the periodical unit according to the present utility model.
FIG. 3 is a graph of CD spectra of the supersurface for different perovskite (including but not limited to MAPbI 3) thickness parameters.
Fig. 4 is a graph of CD spectra at different angles of incidence.
Fig. 5 is a CD spectrum of conductivity of different perovskites including but not limited to MAPbI 3.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without any inventive effort, are intended to be within the scope of the utility model.
As shown in fig. 1, the embodiment of the utility model provides a high-chirality adjustable terahertz wave absorber based on a perovskite material super-surface, and designs a chiral super-surface based on perovskite (including but not limited to MAPbI 3), wherein the chiral super-surface consists of periodically arranged structural units; the structural unit comprises a bottom layer lossy layer 3 and a perovskite layer 1, wherein the edges of the bottom layer lossy layer 3 and the perovskite layer 1 are mutually overlapped, namely the bottom layer lossy layer 3 and the perovskite layer 1 are overlapped in length and width. A middle lossy layer 2 is arranged between the bottom lossy layer 3 and the perovskite layer 1; the shape of the middle lossy layer 2 is of the digital "17" type. The bottom lossy layer 3 is made of a lossy silicon material, the middle lossy layer 2 is made of a lossy gold material, and the perovskite layer 1 is made of a material including but not limited to MAPbI 3. The length of the structural unit is px=2000 μm, and the width is py=1500 μm; the thickness of the underlayer lossy layer 3 is h3=300 μm, the thickness of the intermediate lossy layer 2 is h2=1 μm, and the thickness of the perovskite layer 1 is h1=1 μm.
As shown in fig. 2, in the middle lossy layer 2, the widths of the numerals "1" and "7" are each 200 μm, and the shortest distance of the numerals "1" and "7" is 50 μm.
The preparation method of the high-chirality adjustable terahertz wave absorber based on the perovskite material super surface comprises the following steps:
Step 1, dropwise adding the prepared precursor solution on a substrate by adopting a spin coating method, spin-coating, throwing away redundant solvent in the spin-coating process, and then obtaining a perovskite film required by the perovskite layer 1 by adopting a natural drying mode;
step2, depositing a gold nano film on the high-resistance silicon wafer by utilizing a photoetching technology and a magnetron sputtering method to obtain a middle lossy layer 2;
step 3, performing chemical reaction on the surface of the substrate by adopting a vapor deposition method to generate a silicon film, thus obtaining a bottom lossy layer 3;
Step 4, forming a single structural unit by a bottom lossy layer 3, a middle lossy layer 2 and a perovskite layer 1, and periodically arranging the single structural units at intervals of 50 mu m to obtain the chiral super surface.
The specific implementation mode is as follows:
The chiral subsurface consists of periodically arranged structural units, and the main structure of the chiral subsurface consists of a simple three-layer subsurface structure consisting of perovskite (including but not limited to MAPbI 3) (upper layer), gold (Au) layer (middle layer) and silicon (lower layer).
Chiral supersurfaces are widely used because of their unique optical chiral response. Circular Dichroism (CD) has received extensive attention from researchers as an important indicator of chiral optical response. Circular dichroism is the difference in absorbance of left and right polarized light. High CD values have great potential for use in optical polarization modulators.
Regarding circular dichroism, the absorption rate is generally a (ω), and the calculation formula is a (ω) =1-R (ω) -T (ω). Then R (ω) and T (ω) are the sum of the total reflectance and the total transmittance, respectively. The CD value is determined by the difference in absorption characteristics of left circularly polarized Light (LCP) and right circularly polarized light (RCP). The value of circular dichroism is expressed as cd= [ (RCP) (ω) - (LCP) (ω) ]/[ (RCP) (ω) + (LCP) (ω) ].
Based on the chiral subsurface structure, simulations were performed using CST Microwave Studio software. By varying the perovskite (including but not limited to MAPbI 3) thickness, the super surface geometric phase and the electrical conductivity, the CD value (0-0.47) can be controlled.
The thickness of the perovskite (including but not limited to MAPbI 3) material was varied and set to 0.9 μm and 1.0 μm, respectively. And calculating the absorptivity at different thicknesses. According to the absorption results of different thicknesses, the CD values of different thicknesses can be calculated, and as shown in FIG. 3, the CD value ranges from 0.14 to 0.39. It was found that the CD value was changed with the change in thickness. When electromagnetic waves are perpendicularly incident into the super-surface structure of a metal, the resonance mode of the metal changes. The change of the structural symmetry can lead to uneven charge distribution in the metal layer, the resonance frequency of the electric dipole is reduced, and the absorption of circularly polarized light is affected.
The absorption values of the left-hand and right-hand rotations of 3 parameters of 0 degree, 45 degrees and 75 degrees are calculated respectively by changing different angles of the incident light, and the CD value under each angle is calculated. As shown in FIG. 4, it can be seen that the CD value increases and the CD value ranges from 0 to 0.45 as the incident angle increases. The data at 0 ° shows an almost parallel curve with CD values close to 0. Significant mirror symmetry indicates that there are two different orthogonal linear polarizations. The response of the incident wave to the magnetic field component and the response of the metamaterial structure to the electric field component also vary in different polarization directions. The absorption peak around 0.15THz creates irregularities, which may be due to the inclusion of some other impurities in the chosen material, affecting the absorption of circularly polarized light.
By varying the conductivity, the absorbance values for the left-hand and right-hand rotations at 100S/m, 500S/m, 2000S/m parameters for perovskite (including but not limited to MAPbI 3) conductivities, respectively, are calculated, and CD values at different conductivities can be obtained. CD values range from 0 to 0.47. As shown in fig. 5, the conductivity increases and the CD value increases, and the CD value converges to 0 infinitely at a conductivity of 100S/m. For perovskite (including but not limited to MAPbI 3) material films close to the insulating phase, the local field intensity effect of the surface of the metal layer is weak, and the transmission of terahertz waves is enhanced. Perovskite (including but not limited to MAPbI 3) films have a greater metallic character than 2000S/m conductivity. The local enhancement effect of the metal layer is completely suppressed. Only a small fraction of terahertz waves can enter the silicon substrate through the metal layer array and perovskite (including but not limited to MAPbI 3) films.
It is shown by the above circular polarization experiments that the change of the incident angle causes the change of polarized light absorption, thereby affecting circular dichroism. The utility model adopts a complete Stokes method to prove the relationship between the change of the incident angle and the absorption of circularly polarized light in an ellipsoidal state. The Full Stokes method is introduced to establish a poincare sphere model, and the terahertz (0.1 THz) incident Full Stokes parameters S1, S2 and S3 are obtained, wherein the Full Stokes parameters comprise intensity, direction and ellipticity. It was finally found that the higher harmonic components caused by the asymmetric design of the supersurface affect the optical response of the structure. The Stokes vector parameters in the elliptical polarization state change regularly to different degrees, so that the change of the incidence angle of the elliptical polarization state can cause the shift of the circularly polarized light absorption value, and circular dichroism is affected.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (4)
1. The high-chirality adjustable terahertz wave absorber based on the perovskite material super surface is characterized by comprising a chiral super surface, wherein the chiral super surface consists of periodically arranged structural units; the structural unit comprises a bottom layer lossy layer (3) and a perovskite layer (1), wherein the edges of the bottom layer lossy layer (3) and the perovskite layer (1) are mutually overlapped, and a middle lossy layer (2) is arranged between the bottom layer lossy layer (3) and the perovskite layer (1); the shape of the middle lossy layer (2) is of the digital "17" type.
2. The high-chirality tunable terahertz absorber based on perovskite material super surface according to claim 1, wherein the bottom lossy layer (3) is made of lossy silicon material, and the middle lossy layer (2) is made of lossy gold material.
3. The high chirality tunable terahertz absorber based on a perovskite material super surface according to claim 1, wherein the structural unit has a length px=2000 μm and a width py=1500 μm; the thickness of the underlayer lossy layer (3) is h3=300 μm, the thickness of the intermediate lossy layer (2) is h2=1 μm, and the thickness of the perovskite layer (1) is h1=1 μm.
4. The highly chiral tunable terahertz absorber based on the super-surface of perovskite material according to claim 1, characterized in that in the middle lossy layer (2), the widths of the numbers "1" and "7" are both 200 μm, and the shortest distance of the numbers "1" and "7" is 50 μm.
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