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Broadband quarter-wave plate based on single-layer anisotropic metamaterial

An anisotropic, metamaterial technology, applied in instruments, polarizing elements, optics, etc., can solve problems such as narrow bandwidth limitations, and achieve the effect of easy preparation and simple structure

Active Publication Date: 2022-06-17
NORTHEAST GASOLINEEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, many single-layer terahertz quarter-wave plates often suffer from severe limitations of narrow bandwidth

Method used

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  • Broadband quarter-wave plate based on single-layer anisotropic metamaterial
  • Broadband quarter-wave plate based on single-layer anisotropic metamaterial
  • Broadband quarter-wave plate based on single-layer anisotropic metamaterial

Examples

Experimental program
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Effect test

Embodiment 1

[0025] The broadband quarter-wave plate based on a single-layer anisotropic metamaterial is composed of a dielectric layer 1 and an artificial electromagnetic material structural layer 2. The artificial electromagnetic material structural layer 2 is photoetched on the upper surface of the dielectric layer 1. (like figure 1 ), the artificial electromagnetic material structure layer 2 is composed of the basic units of the continuous stepped zigzag line structure layer arranged periodically.

[0026] The material of the dielectric layer 1 is polyimide, and the thickness of the dielectric layer 1 is t = 27 μm, its thickness is on the order of microns. The material of the basic unit of the structural layer is copper, and the thickness of the basic unit of the structural layer is t m = 200 nm, its thickness is on the order of nanometers.

[0027] like figure 2 As shown, the basic unit of the structural layer is formed by a single L-shaped structure 3 of equal line width, a ste...

Embodiment 2

[0030] The only difference between Example 2 and Example 1 is that the material of the dielectric layer 1 is silicon dioxide, and the material of the basic unit of the structural layer is gold.

Embodiment 3

[0032] The only difference between Embodiment 3 and Embodiment 1 is that the material of the dielectric layer 1 is polyimide, and the material of the basic unit of the structural layer is aluminum.

[0033] The above embodiments work in the terahertz wave band, and the following will be combined image 3 To further illustrate the implementation, first set up a quarter-wave plate for the terahertz broadband xyz The coordinate axis is used as the working platform, and the z-axis is perpendicular to the surface of the quarter-wave plate. like image 3 shown, x After the direction-polarized linearly polarized light L is vertically incident on the surface of the quarter-wave plate device along the -z direction, the circularly polarized output light is C, indicating that this metamaterial device is suitable for xDirectionally polarized linearly polarized light can achieve circular polarization conversion characteristics, which can be analogous to the function of a quarter-wave p...

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Abstract

A broadband quarter-wave plate based on a single-layer anisotropic metamaterial proposed by the present invention relates to a transmission control device for terahertz waves, which is composed of a dielectric layer and an artificial electromagnetic material structure layer. The artificial electromagnetic material structure layer is photoetched on the upper surface of the dielectric layer, and is composed of periodically arranged continuous step-shaped zigzag line structure layer basic units. The wide-band quarter-wave plate based on single-layer anisotropic metamaterials proposed by the present invention can realize the polarization conversion function from linearly polarized light to circularly polarized light in a wider frequency band, and is suitable for broadband polarization in the terahertz band. The development of conversion devices and compact nanophotonic devices is of great significance.

Description

Technical field: [0001] The invention relates to a transmission control device for terahertz waves, in particular to control the transmission of electromagnetic waves linearly polarized state and circularly polarized state, and realizes the conversion of broadband linearly polarized light to circularly polarized light through the delicate combination design of wire grid structures , which can be compared to a quarter-wave plate. Background technique: [0002] Terahertz (THz) waves generally refer to electromagnetic waves with frequencies in the range of 0.1-10 THz, which are located between millimeter waves and infrared waves, occupying an important position in the electromagnetic spectrum. Terahertz waves have many superior characteristics, and have important research value and application prospects in basic disciplines such as physics and life sciences, as well as applied disciplines such as security detection, medical imaging, and communication technology. [0003] Metam...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30
CPCG02B5/30G02B5/3083
Inventor 吕婷婷刘东明刘超刘强董秋璇宋美萍
Owner NORTHEAST GASOLINEEUM UNIV
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