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A blade type terahertz wave broadband linear polarizer

A terahertz and polarizer technology, which is applied in the field of blade-type terahertz wave broadband linear polarizers, can solve the problems of low polarization conversion rate and narrow polarization conversion band of linear polarizers, and achieve polarization conversion. high rate effect

Inactive Publication Date: 2018-08-07
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a blade-type terahertz wave broadband linear polarizer in view of the existing technical defects, thereby solving the problems of narrow polarization conversion band and low polarization conversion rate of the linear polarizer. not high problem

Method used

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  • A blade type terahertz wave broadband linear polarizer
  • A blade type terahertz wave broadband linear polarizer
  • A blade type terahertz wave broadband linear polarizer

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Embodiment 1

[0033] The thickness of the substrate set in this embodiment is 1 micron, the material is silicon, the metal reflective layer is 0.5 micron, the material is silver, the thickness of the dielectric layer is 48 micron, the material is PMMA, the real part of its dielectric constant is 3, and the virtual part is 3. Part is 0.03, the thickness of the upper metasurface is 0.05 microns, and the material is silver. The size of the unit structure is p=260 microns, a=165 microns, b=57 microns, and the value of k is 1 at this moment. Through numerical simulation, the copolar conversion amplitude (R ss ) and vertical polarization conversion amplitude (R ps ),Such as Figure 4 shown.

Embodiment 2

[0035] The thickness of the substrate set in this embodiment is 1000 microns, the material is silicon, the metal reflective layer is 0.5 microns, the material is silver, the thickness of the medium layer is 24 microns, the material is PMMA, the real part of its dielectric constant is 3, and the virtual part is 3. Part is 0.03, the thickness of the upper metasurface is 0.05 microns, and the material is silver. The size of the unit structure is p=130 microns, a=82.5 microns, b=28.5 microns, and the value of k at this time is 0.5. Through numerical simulation, the copolar conversion amplitude (R ss ) and vertical polarization conversion amplitude ((R ps ),Such as Figure 5 shown.

Embodiment 3

[0037] The thickness of the substrate set in this embodiment is 1 micron, the material is silicon, the metal reflective layer is 0.5 micron, the material is silver, the thickness of the dielectric layer is 4.8 micron, the material is PMMA, the real part of its dielectric constant is 3, and the virtual part is 3. Part is 0.03, the thickness of the upper metasurface is 0.05 microns, and the material is silver. The size of the unit structure is p=26 microns, a=16.5 microns, b=5.7 microns, and the value of k at this moment is 0.1. Through numerical simulation, the copolar conversion amplitude (R ss ) and vertical polarization conversion amplitude (R ps ),Such as Figure 6 shown.

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Abstract

The invention relates to a blade-type terahertz wave broadband linear polarizer, which is formed by periodic arrangement of unit structures, and each unit structure has four layers, which are base (4) and metal reflection layer (3) from bottom to top , dielectric layer (2) and metasurface (1). The invention utilizes the vane-shaped metasurface to realize three continuous high-efficiency polarization conversion frequency bands, which is higher than the two continuous high-efficiency polarization conversion frequency bands of the existing polarizer, thereby proposing a method for widening the frequency band, and can High polarization conversion efficiency is achieved, and the size of the structure can be scaled to achieve arbitrary movement of the frequency band in terahertz. The blade-type terahertz wave broadband linear polarizer described in the present invention is applicable to the fields of communication, sensing, radar and the like.

Description

technical field [0001] The invention relates to a blade type terahertz wave broadband linear polarizer. Specifically, a terahertz polarizer with a high polarization conversion rate in a wide frequency band is obtained by using the long-side gradual change of the blade-shaped metasurface. Background technique [0002] Terahertz technology has rapid development and application in non-destructive testing, safety, communication, and sensing. This application requires not only highly efficient terahertz sources and highly sensitive detectors, but also components like modems, prisms, waveplates, converters, and polarization converters. The lack of effective equipment for manipulating terahertz waves has limited the development of terahertz technology. The conventional approach is to change the polarization state through birefringent materials such as liquid crystals and quartz. However, in the terahertz band, the birefringence index Δn of naturally occurring materials is very s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q15/24H01Q1/38
Inventor 王维夏云官建国李维
Owner WUHAN UNIV OF TECH
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