Surface-plasmon-polariton spectral absorption device based on periodic chirp structure

A technology of spectral absorption and surface plasmon, which is applied in the field of ion polariton resonant cavity spectral absorption devices, can solve problems such as fluctuations in the working wavelength range, and achieve the effect of low and flat reflection band gap

Inactive Publication Date: 2013-07-10
SUZHOU UNIV
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Problems solved by technology

However, this structure only absorbs 70% of the incident light in the 2.5 μm band at 8.5 μm. This is because of the m...

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  • Surface-plasmon-polariton spectral absorption device based on periodic chirp structure
  • Surface-plasmon-polariton spectral absorption device based on periodic chirp structure
  • Surface-plasmon-polariton spectral absorption device based on periodic chirp structure

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[0025] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described The embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0026] A surface plasmon spectral absorption device based on a periodic chirp structure, comprising a substrate, a first metal layer on the substrate, and a plurality of gratings on the first metal layer, the grating including an insulator on the first metal layer And the second metal layer on the insulator layer, the ...

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Abstract

The invention discloses a surface-plasmon-polariton spectral absorption device based on a periodic chirp structure. The surface-plasmon-polariton spectral absorption device comprises a substrate, a first metal layer and a plurality of gratings, wherein the first metal layer is positioned on the substrate; the plurality of gratings are positioned on the first metal layer; each grating comprises an insulator body positioned on the first metal layer and a second metal layer positioned on the insulator body; and the gratings are in linear chrip at least along the X direction or Z direction or along the two directions simultaneously. The surface-plasmon-polariton spectral absorption device disclosed by the invention has the advantages that since the period of the gratings adopts the linear chrip, the resonant wavelength is in linear distribution and covers larger spectral range, and the bandwidth of the whole forbidden band is realized and widened by properly adjusting a chrip coefficient of the gratings and a resonant cavity formed by an upper metal layer/insulator layer/lower metal layer, so that the possibility for realizing a low and flat reflecting forbidden belt is realized; and under the limiting condition of phase matching and sub-wavelength size, nearly-perfect absorption of the bandwidth can be realized by proper design.

Description

Technical field [0001] The invention relates to the technical field of surface plasmon resonant cavities, in particular to a surface plasmon resonant cavity spectral absorption device based on a periodic chirp structure. Background technique [0002] Metal is generally considered to be a highly efficient reflector and is sometimes used as a mirror. However, when the metal surface is etched into micro-nano structures according to the required operating wavelength, the reflected light on the metal surface can be greatly reduced. The micro-nano structure may become a highly efficient absorber in a large electromagnetic wave range, from visible light, infrared to microwave. In the past few years, this has aroused great interest and triggered a lot of theoretical and experimental research. In 2008, Landry et al. proposed and confirmed a metamaterial structure that almost completely absorbs. It is composed of two metamaterial resonant cavities, which are respectively coupled with el...

Claims

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Application Information

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IPC IPC(8): G02B5/22G02B5/18
Inventor 王钦华宋艳芹楼益民曹冰李孝峰
Owner SUZHOU UNIV
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