Medium-long wave infrared wide-spectrum light absorption material and preparation method thereof

Abstract

The invention belongs to the field of preparation of inorganic functional materials, and particularly relates to a medium-long-wave infrared wide-spectrum light absorption material and a preparation method thereof, the medium-long-wave infrared wide-spectrum light absorption material is formed by sequentially stacking an alumina pore structure, a silicon pore structure, a silicon nano-pore structure and a silicon substrate; and the silicon nanopore structures are distributed in the silicon hole structures and the silicon substrate. The medium-long-wave infrared wide-spectrum light absorption material is formed by stacking four layers of materials in sequence, a refractive index gradient material is formed, and high-temperature-resistant wide-spectrum light absorption of medium-far infraredbands is achieved through free carrier absorption of a silicon material with the adjustable doping concentration in the medium-long-wave infrared bands. The medium-long wave infrared wide-spectrum light absorption material is large in absorption wavelength range, high in absorption efficiency, small in absorption layer thickness, free of polarization dependence, large in incident angle range andresistant to high temperature.

Description

technical field [0001] The invention belongs to the field of preparation of inorganic functional materials, and in particular relates to a medium-long-wave infrared wide-spectrum light-absorbing material and a preparation method thereof. Background technique [0002] Broad-spectrum light-absorbing materials in the medium and long-wave infrared bands can be used in infrared analog light sources, infrared stealth, infrared photothermal detection, infrared enhanced spectroscopy, waste heat utilization, etc., so they have been valued by research. Among them, broad spectrum, non-polarization dependence, and large incident angle are important performance indicators. In addition, broad-spectrum absorbing materials with high temperature resistance are of great value in aerospace and broad-spectrum infrared thermal light sources. [0003] The structure design of broad-spectrum absorbing materials follows two lines of thought. The first is to enhance the absorption characteristics of...

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Problems solved by technology

The problem with the first idea is that the superposition of multi-band resonance modes is difficult to achieve ultra-wide-band light absorption. Due to the limitation of the plasmon resonance wavelength, it is difficult to adjust the absorption wavelength to the mid-to-far infrared band, and light-absorbing materials containing metal nanostructures Can not withstand high temperature, high power light irradiation and other conditions

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