Broadband polarization selective metamaterial absorber and infrared detector

Abstract

The invention discloses a broadband polarization selective metamaterial absorber. The broadband polarization selective metamaterial absorber comprises a substrate, a continuous metal layer, a continuous dielectric layer and stacked gratings in order from bottom to top; the stacked gratings are strip-shaped gratings and are arranged on the surface of the continuous dielectric layer at intervals along the width direction of the stacked gratings; the stacked grating comprises grating metal layers and grating dielectric layers, which are alternately stacked in a height direction, and the gratingmetal layer is located on the outermost layer of the stacked grating; and the widths of the plurality of stacked gratings are different. The broadband polarization selective metamaterial absorber disclosed by the invention is provided with the plurality of stacked gratings with different widths, wherein each stacked grating with a different width corresponds to an absorption peak of electromagnetic waves of different wavelengths, and by setting the sizes of the widths, broadband high absorption is achieved; and in addition, by defining the stacked gratings as the strip-shaped gratings, the broadband polarization selective metamaterial absorber disclosed by the invention realizes the polarization selective absorption of electromagnetic waves. The invention further provides an infrared detector with the above beneficial effects.

Description

technical field [0001] The invention relates to the field of infrared absorbers, in particular to a broadband polarization-selective metamaterial absorber and an infrared detector. Background technique [0002] Any object with a temperature higher than absolute zero will radiate electromagnetic waves in the infrared band due to the motion of its own molecules. Infrared radiation contains a wealth of information, and infrared detectors are devices that use infrared radiation to obtain target information. In some scenes where visible light is lacking (especially at night), infrared detectors can play a great role, whether it is military or civilian, it has great application prospects. Among them, metamaterial absorbers have become the choice of more and more people in this field. [0003] The metamaterial absorber is an array structure composed of subwavelength artificial metal micro-nano units. It uses the mechanism of localized surface plasmon resonance to localize the inc...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a broadband polarization selective metamaterial absorber and an infrared detector to solve the problem that the absorber in the prior art cannot have both long-wave infrared broadband high absorption, high polarization selectivity and excessive thickness

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