Method for realizing selective wave absorption through using hyperbolic metamaterial grating and wave absorption device

Abstract

The invention discloses a method for realizing selective wave absorption through using a hyperbolic metamaterial grating. According to the method, on the basis of the hyperbolic dispersion characteristic of a metal-dielectric periodic film stack, with a sub-wavelength grating structure used in combination, the electromagnetic field enhancement effect of the hyperbolic metamaterial grating is utilized to realize the selective absorption enhancement of light absorptivity for TM polarized incident light; on the basis of determining metal and dielectric material parameters, grating ridge width, metal film layer thickness, dielectric film layer thickness and a film stack number are optimized, the selective absorption enhancement of the light absorptivity under different wave bands can be realized; and the grating ridge width can be adjusted, so that the selection of an absorption peak position can be achieved; and the selective absorption characteristic of the structure is insensitive to the metal-dielectric film stack number, and therefore, the method has high experimental tolerance. Therefore, the method of the present invention has a bright application prospect in fields such as enhanced nano imaging, stealth materials, optoelectronic detection and biosensing. A film stack number can be flexibly selected as needed during practical application.

Description

technical field [0001] The invention relates to the fields of micro-electromechanical systems and photoelectric detection, in particular to a method for selectively absorbing waves by using a hyperbolic metamaterial grating and a wave absorber. Background technique [0002] Dispersion characteristics usually refer to the characteristics of permittivity or permeability changing with wavelength. When two specific materials are combined in a certain way, hyperbolic dispersion characteristics will appear in a specific band (frequency band). The combined material is called a hyperbolic metamaterial, and the specific band is a hyperbolic band (hyperbolic band exhibits a hyperbolic dispersion curve). In the hyperbolic band, the hyperbolic metamaterial permittivity or permeability tensor is negative in one direction and positive in the other two directions. Hyperbolic metamaterial is a kind of anisotropic material, which has unique hyperbolic dispersion properties. Hyperbolic met...

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Problems solved by technology

Although the above methods are all based on the absorption enhancement achieved by the hyperbolic metamaterial microstructure and have high light absorption efficiency, they are all aimed at broadband absorption, and the obtained absorbers do not have good selective absorption function.

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