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Terahertz chiral modulator based on superstructure hole structure

A technology of terahertz and hole structure, applied in the direction of instruments, optics, optical components, etc., can solve the problems of limiting the working efficiency of chiral modulators, loss of the polarization state of incident light, and low efficiency of exciting surface plasmons, so as to reduce the number, The effect of small device size and high excitation efficiency

Inactive Publication Date: 2018-04-24
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the efficiency of exciting surface plasmons in traditional metal slot resonators is low, which limits the working efficiency of the entire chiral modulator.
Moreover, the original polarization state of the incident light will be lost when the circularly polarized light passes through the rectangular metal slit

Method used

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  • Terahertz chiral modulator based on superstructure hole structure
  • Terahertz chiral modulator based on superstructure hole structure
  • Terahertz chiral modulator based on superstructure hole structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] A metapore structure for chirality-dependent transmission and surface plasmon excitation of terahertz waves, the modulation process is:

[0057] (1) The super-surface metal ring 1 and the hollowed-out metal plate 3 are made of aluminum metal.

[0058] (2) The intermediate dielectric layer 2 is polyimide with a thickness of 20 microns, and the bottom dielectric layer 4 is polyimide with a thickness of 10 microns.

[0059] (3) The diameter of the metal hole is selected as d=150 microns, and the response frequency of the transmission peak is around 0.75 T Hz.

[0060] (4) The plasmon orbital angular momentum that the metal ring needs to carry is l=σ, which can be obtained by copying a circle of the metal strip around point O, as figure 2 shown.

[0061] (5) The metal strip size of the metal strip to the resonator is 113×25 microns 2 , the center distance is s=200 microns, and the orientation angle θ=45°.

[0062] (6) The number of metal strips is N=50, the direction a...

Embodiment 2

[0066] A metapore structure for chirality control of terahertz output polarization state, the modulation process is:

[0067] (1) The super-surface metal ring 1 and the hollowed-out metal plate 3 are made of aluminum metal.

[0068] (2) The intermediate dielectric layer 2 is polyimide with a thickness of 20 microns, and the bottom dielectric layer 4 is polyimide with a thickness of 10 microns.

[0069] (3) The diameter of the metal hole is selected as d=150 microns, so that the transmission peak is around the response frequency of 0.75 THz.

[0070] (4) The plasmon orbital angular momentum that the metal ring needs to carry is l=-σ, and the metal strip rotates clockwise around the point O to replicate a circle, and the angle at which the mth pair of metal strips rotate is denoted as α m , each metal strip rotates counterclockwise α around itself after being copied by rotation m ,Such as Image 6 shown.

[0071] (5) The size of the two metal strips of the metal strip pair r...

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Abstract

The invention relates to the chiral modulator technology and provides a multi-functional chiral modulator which works in a terahertz band and has a simple structure, and chiral dependent transmission,chiral dependent surface plasmon excitation, chiral polarization state control and the like can be achieved. Therefore, the terahertz chiral modulator based on a superstructure hole structure is disclosed, the superstructure hole structure is formed by four layers which are a metasurface metal ring, a dielectric layer, a metal plate hollowed out in the middle and a dielectric layer from the top to bottom, metal strip pair resonators are employed by basic units of the metasurface metal ring of the top layer, each of the metal strip pair resonators is formed by two same metal strips which are perpendicular to each other, the metal strip pair resonators are uniformly and rotatingly arranged around a center point O to form the metal ring, the center of the metal ring is opposite to the centerof a metal hole made in the metal plate. A strong magnetic effect can be generated by the design of the metal ring, the dielectric layer and the metal plate. The terahertz chiral modulator is mainlyapplied to the design and manufacture of chiral modulators.

Description

technical field [0001] The invention is a terahertz chiral modulator based on a superstructured hole structure, which belongs to electromagnetic functional devices. Specifically, it involves a terahertz chiral modulator based on a metapore structure. Background technique [0002] Terahertz (terahertz, THz, 1THz = 10 12 Hz) band has attracted a large number of scholars due to its unique properties. In recent years, terahertz technology has shown great application potential in the fields of high-speed communication, radar detection, security inspection and drug detection. The advancement of terahertz technology requires efficient terahertz sources, detectors and various functional devices such as polarization controllers working in the terahertz band [1] , chiral modulator [2,3] and filter [4] Wait. At present, great progress has been made in THz sources and detectors, but the development of THz functional devices, including THz chiral modulators, has been relatively slow...

Claims

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Application Information

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IPC IPC(8): G02B5/00G02B5/30
CPCG02B5/008G02B5/30
Inventor 熊小雨张学迁韩家广张伟力
Owner TIANJIN UNIV
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