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Focusing type terahertz polarization controller

A polarization controller and terahertz technology, which is applied in the field of terahertz waves, can solve problems such as limiting the scope of application, and achieve the effects of meeting application requirements, being easy to process, and having a simple structure.

Pending Publication Date: 2022-01-07
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this type of material only has birefringence characteristics at certain fixed frequency points, resulting in the polarization of terahertz waves only at a single frequency point, which greatly limits the application range of this type of polarizing device. Efficient terahertz wave polarization control method becomes very important

Method used

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  • Focusing type terahertz polarization controller
  • Focusing type terahertz polarization controller
  • Focusing type terahertz polarization controller

Examples

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Embodiment 1

[0034] In this embodiment, the structure of the focused terahertz polarization controller and the shape of each component are as described above, so details are not repeated here. However, the specific parameters of each component are as follows:

[0035]The structural unit 4 is composed of 16 concave metal microstructures 5 with notches, and the 16 microstructures are obtained by counterclockwise rotation with the angle α=22.5° between the notch of the concave metal microstructure and the x-axis as the step size. The notched concave metal microstructures 5 are arranged in an "S" shape. The metal notch on the top layer has 6 sides with a length of 50 μm and a line width of 5 μm. The concave part on the left side is 20 μm wide and 10 μm high. The opening on the right side has a width of 10 μm and a thickness of 1.0 μm. The material is gold. The polyimide dielectric layer 7 has a thickness of 40 μm. The bottom metal plate 8 has a thickness of 0.2 μm and is made of gold.

[00...

Embodiment 2

[0038] In this embodiment, the structural unit 4 of the focused terahertz polarization controller is composed of 3×3 concave metal microstructures 5 with notches, wherein the concave metal microstructures 5 with notches are changed to α=40° The step size is rotated counterclockwise, such as Figure 10 shown. The terahertz wave signal is input from the input terminal 1, and is output from the reflected terahertz wave output terminal 2 through the action of the focused terahertz polarization controller. When the left-circularly polarized terahertz wave is incident from the input end 1, the terahertz wave with a frequency of 1 THz is reflected by the metasurface polarizer 3 and output from the reflected terahertz wave output end 2, at z=900 μm directly above the array focuser 3 , no focus is found in the xy plane (eg Figure 11 shown), indicating that the reflected THz waves are not focused. When the right-circularly polarized terahertz wave with a frequency of 1THz is inciden...

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Abstract

The invention discloses a focusing type terahertz polarization controller. The focusing type terahertz polarization controller is characterized by comprising a terahertz wave incident end, a reflected terahertz wave output end and a metasurface polarizer, wherein the metasurface polarizer is formed by periodically arranging N * N structural units on a plane perpendicular to the input direction of terahertz waves, wherein N is a natural number; each array unit is obtained by anticlockwise rotating 4 * 4 concave metal microstructures with notches by taking alph = 22.5 degrees as a step length; and each concave metal microstructure with the notch comprises sequentially a metal notch concave on the top layer, a polyimide dielectric layer on the middle layer and a metal plate on the bottom layer from top to bottom. The focusing type terahertz polarization controller has the advantages of being simple in structure, easy to machine and the like; different focus orientations can be generated for incidence of terahertz waves in different polarization states, and the application requirement of a terahertz wave communication multiplexing system is met.

Description

technical field [0001] The invention relates to the field of terahertz waves, in particular to a focusing type terahertz polarization controller. Background technique [0002] Terahertz waves refer to electromagnetic waves with a frequency of 0.1~1.0THz, located between microwave and infrared in the electromagnetic spectrum, corresponding to the transition zone from macroscopic classical theory to microscopic quantum theory, and from the field of electronics to the field of photonics. Subject. For quite a long period of time, the terahertz band was considered a forbidden area in the electromagnetic spectrum. Due to the lack of radiation sources and detectors that can effectively generate and detect terahertz waves, the terahertz band has always been called "terahertz gap" and has not attracted much attention in the scientific community. In recent years, with the rapid development of terahertz sources and detectors and the continuous research and development of terahertz fu...

Claims

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Application Information

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IPC IPC(8): H01Q15/00G02B5/30
CPCH01Q15/0086G02B5/30
Inventor 李九生仲敏
Owner CHINA JILIANG UNIV
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