Infrared light perfect absorber and preparation method thereof

Abstract

The invention discloses an infrared light perfect absorber and a preparation method thereof, and aims at introducing a colloidal crystal material, utilizing electromagnetic resonance characteristics of a plasmonic element and a colloidal crystal on a metal surface, and adopting a colloid self-assembling method to prepare an infrared light perfect absorber that includes a substrate, a light-proof metal film layer on the substrate and a colloidal crystal-metal thin film resonance structure layer disposed on the metal film layer. The colloidal crystal-metal thin film resonance structure layer iscomposed of multiple identical colloidal crystal particles and a metal thin film deposited on the upper surface of each of the colloidal crystal particles. The colloidal crystal particles are uniformly arranged on the metal film layer. With the colloidal crystal-metal thin film resonance structure layer, the structure of an absorption unit of an original infrared light perfect absorber is simplified, the bandwidth of the absorption spectrum of the infrared light perfect absorber is increased, and the preparation requirements of low cost and easy large-area preparation are satisfied by using the colloid self-assembling method.

Description

technical field [0001] The invention relates to the fields of photoelectric functional materials and devices and photonics, in particular to an infrared light perfect absorber and a preparation method thereof. Background technique [0002] The optical perfect absorber is an essential component to realize high-efficiency spectral light absorption and photodetection, and it can realize the absorption of light wave energy in a specific band or multiple band spectral ranges. The principle of the optical perfect absorber is generally that the optical resonance mode of the dielectric guided wave, the metal plasmon resonance, and the spectral phase coupling or coherence cause the resonant absorption or trapping of the light wave. Optically perfect absorbers in the near-infrared and mid-infrared bands can be used as building blocks for photoelectric converters, thermal emitters, or as coating materials to reduce stray emissions of electromagnetic waves. [0003] The research on ele...

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Problems solved by technology

Therefore, this kind of three-layer structured optical perfect absorber is difficult to manufacture in a large area and at low cost, and thus cannot be effectively expanded to electronically controlled or optoelectronic functional device platforms.

In addition, these three-layer structured light perfect absorbers often can only absorb electromagnetic waves of a single resonance wavelength, which is narrow-band light absorption, that is, they cannot achieve infrared broadband or infrared ultra-broadband light absorption.

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