Broadband THz wave plate composed of specific electromagnetic surface

A special surface and wave plate technology, applied to electrical components, antennas, polarizing components, etc., can solve problems such as difficult to achieve refractive index

Active Publication Date: 2015-04-22
FUDAN UNIV
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  • Abstract
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Problems solved by technology

In addition, because the traditional plan regulation is realized by regulating the propagation phase inside the medium, for different frequencies, for natural materials, it is dif

Method used

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  • Broadband THz wave plate composed of specific electromagnetic surface
  • Broadband THz wave plate composed of specific electromagnetic surface
  • Broadband THz wave plate composed of specific electromagnetic surface

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Embodiment Construction

[0024] For the ultra-broadband THz wave plate, it is divided into two parts: the preparation process and the measurement process.

[0025] 1. Preparation of ultra-broadband THz wave plate:

[0026] According to the parameters about the whole system optimized by numerical simulation, the designed samples are prepared by using micro-nano processing technology. The main preparation steps include:

[0027] (1) Clean the silicon wafer, and evaporate 50nm gold on it by electron beam evaporation.

[0028] (2) Slice the silicon wafer with the evaporated gold layer into a size of 1.2cm*1.2cm, paste a layer of adhesive tape (polyimide resin film) on it, the thickness is about 60um, and the power saving parameter of the dielectric layer is about ε =3.1+0.04i.

[0029] (3) Apply LOR (polybutylene oxime) at 4000rpm, dry at 180° for about 3 minutes, apply photoresist AZ5214 at 5000 rpm, and dry at 95° for 90s.

[0030] (4) Use UPG501 plate making machine to directly write the designed s...

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Abstract

The invention belongs to the technical field of electromagnetic wave polarization regulation and control and particularly relates to a broadband THz wave plate composed of a specific electromagnetic surface. The whole wave plate is manufactured on a silicon wafer substrate and composed of a bottom back scattering metal layer, a medium layer and a surface anisotropy specific medium layer. The broadband THz wave plate is a reflection-type ultra wideband THz wave plate manufactured on the basis of specific media and the specific electromagnetic surface, and the working frequency of the broadband THz wave plate ranges from 0.45 THz to 1.15 THz. With regard to plane linearly-polarized electromagnetic waves which are emitted into the broadband THz wave plate at a specific polarization angle phi within the frequency range, the reflected waves of the plane linearly-polarized electromagnetic waves can generate 90-degree polarization deflection with the efficiency exceeding 95%, and the overall energy loss is small (lower than 10%); in addition, with regard to the plane linearly-polarized electromagnetic waves which are obliquely incident at different angles theta (below 50 degrees), the effect of the broadband THz wave plate is lowered slightly, and ultrahigh polarization deflection efficiency can still be achieved within a wide frequency band range. A user can manufacture the wave plate of a corresponding structure according to the needs. Besides, the working frequency of the wave plate can be changed by zooming in or zooming out the structure dimensions in equal proportion.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic wave polarization regulation, and in particular relates to a reflective ultra-broadband terahertz wave plate. Background technique [0002] The development of information technology has made human beings more and more widely used in the regulation of information carriers (electromagnetic waves). For many new applications of electromagnetic waves, such as subwavelength imaging, negative refraction, total absorption, and field enhancement, traditional materials are increasingly difficult to meet the requirements. For this reason, scientists have begun to construct a new type of artificial composite structure and composite medium, which we call "electromagnetic metamaterials", which have extraordinary physical properties that natural media do not have, and can be easily modulated artificially. And what is used in the present invention is exactly such "electromagnetic meta-medium". Simply pu...

Claims

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Application Information

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IPC IPC(8): H01Q15/00G02B5/30
Inventor 马少杰罗伟杰何琼孙树林周磊
Owner FUDAN UNIV
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