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Broadband polarization-independent long-wave infrared absorber plate

A long-wave infrared, absorption plate technology, applied in instruments, optics, filters, etc., can solve the problem that infrared absorbers cannot take into account the absorption rate, absorption bandwidth and duty cycle.

Inactive Publication Date: 2017-05-31
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a broadband polarization-independent long-wave infrared absorbing plate, which solves the defect that the existing infrared absorber cannot take into account the absorption rate, absorption bandwidth and duty cycle, so as to be able to take into account functions such as broadband, polarization-independent and compact structure.

Method used

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  • Broadband polarization-independent long-wave infrared absorber plate
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Embodiment 1

[0048] Embodiment 1: asfigure 1 As shown, this embodiment includes a substrate layer 4, a bottom metal layer 1, a dielectric layer 2 and a top metal layer 3 from bottom to top, and the bottom metal layer is a continuous metal layer;

[0049] The top metal layer 3 is composed of a plurality of metal pattern groups arranged in a periodic array. Each metal pattern group has the same structure and is composed of a plurality of symmetrically arranged metal pattern units. The size of each metal pattern unit is similar. The metal graphic unit together with the dielectric layer and the underlying metal layer under its vertical projection form a resonant unit, and the thickness of the dielectric layer is adjusted so that the impedance of each resonant unit matches the impedance of the external environment;

[0050] The substrate layer 4 is made of silicon material;

[0051] The bottom metal layer 1 and the top metal layer 3 are made of gold material with a thickness of 100 nanometers; ...

Embodiment 2

[0061] Embodiment 2: as Figure 4 As shown, this embodiment includes a substrate layer 4, a bottom metal layer 1, a dielectric layer 2 and a top metal layer 3 from bottom to top, and the bottom metal layer is a continuous metal layer;

[0062] The top metal layer 3 is composed of a plurality of metal pattern groups arranged in a periodic array. Each metal pattern group has the same structure and is composed of a plurality of symmetrically arranged metal pattern units. The size of each metal pattern unit is similar. The metal graphic unit together with the dielectric layer and the underlying metal layer under its vertical projection form a resonant unit, and the thickness of the dielectric layer is adjusted so that the impedance of each resonant unit matches the impedance of the external environment;

[0063] The dielectric layer 2 has the same pattern as the vertical projection of the top metal layer 3, and coincides with the pattern of the top metal layer 3 in the vertical di...

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Abstract

A broadband polarization-independent long-wave infrared absorber plate belongs to infrared absorber devices, overcomes the shortcomings that a conventional infrared absorber cannot draw the absorptivity, the absorption bandwidth and the duty cycle into consideration, and is broadband, polarization-dependent and compact in structure. The broadband polarization-independent long-wave infrared absorber plate sequentially comprises a substrate layer, a bottom metal layer, a dielectric layer and a top metal layer from bottom to top, wherein the top metal layer consists of a plurality of metal graphic groups in periodically array arrangement, the metal graphic groups are the same in structure, each metal graphic group consists of a plurality of metal graphic units in symmetrical arrangement and with approximate sizes, and each metal graphic unit, together with the dielectric layer and the bottom metal layer under vertical projection of the corresponding metal graphic unit, forms a resonant unit. The broadband polarization-independent long-wave infrared absorber plate can realize perfect absorption of electromagnetic waves with specific wavelengths, the resonant units can realize polarization-independent absorption and ultra-wide-band absorption, the structures and the distances of the resonant units are optimized, the structural duty cycle can be improved, and device miniaturization can be realized.

Description

technical field [0001] The invention belongs to infrared absorbing devices, in particular to a broadband polarization-independent long-wave infrared absorbing plate. Background technique [0002] Infrared technology has an increasing impact on all aspects of people's lives, and infrared detection technology plays an especially important role in the military field. Infrared absorptivity is an important performance parameter that determines the infrared responsivity of the detector. Obtaining a polarization-independent infrared broadband absorber with a compact structure and high absorptivity is an important method to improve the performance of the detector. However, with the increase of working wavelength, infrared detectors face the problems of prolonging the transit time of photogenerated carriers, reducing photoconductive gain and responsivity, while the infrared absorber (or infrared photon Antenna) structure can effectively solve this problem. [0003] The absorber bas...

Claims

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Application Information

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IPC IPC(8): G02B5/20G02B5/22
CPCG02B5/208G02B5/207G02B5/22
Inventor 陈长虹于洪浩李霄
Owner HUAZHONG UNIV OF SCI & TECH
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