An infrared metamaterial absorber

Abstract

The invention provides an infrared metamaterial wave absorbing body. The infrared metamaterial wave absorbing body comprises at least four wave absorbing body units arranged in a matrix mode. Each wave absorbing body unit comprises a substrate, a metal layer located right above the substrate, a dielectric layer located right above the metal layer and a cross round ring structure located right above the dielectric layer, wherein the cross round ring structure is attached to the surface of the dielectric layer and formed by crossing a round ring and a cross and then removing the cross part in the round ring, the circle center of the round ring and the geometric center of the cross coincide, and the cross part outside the round ring forms four arms of the cross round ring structure. The lengths of the four arms of the cross round ring structure are the same, the widths of the four arms of the cross round ring structure are the same, the cross sections of the substrate, the metal layer and the dielectric layer are all square, and the arms of the cross round ring structure are parallel with one edge of each square. The infrared metamaterial wave absorbing body is high in absorbing rate, wide in incidence angle and insensitive in polarization, and has good tunability.

Description

technical field [0001] The invention belongs to the field of infrared technology, and in particular relates to an infrared metamaterial absorber. Background technique [0002] Infrared absorbing materials refer to special functional materials that have strong absorption for a certain frequency band or several frequency bands in the infrared region, and are the key to the preparation of high-performance infrared sensors. Traditional infrared absorbing materials mainly use the energy level transition of the material to convert electromagnetic energy into molecular potential energy, electronic potential energy, etc. inside the material. The conversion efficiency will be limited by the material, and it is difficult to achieve ultra-high infrared absorption. As a new type of electromagnetic absorption structure, metamaterial absorbers can achieve near-perfect absorption of electromagnetic waves based on electromagnetic coupling. [0003] As a new artificial electromagnetic mater...

AI Technical Summary

Problems solved by technology

At present, the structure of the infrared metamaterial absorber that has been studied more is a cross structure. The infrared metamaterial absorber of this structure can achieve ultra-high absorption at a specific wavelength, but its tunable range is narrow, and when the incident angle is large The absorption rate is significantly reduced. When the TE wave is incident, when the incident angle is greater than 40 degrees, the absorption rate is significantly reduced. These defects limit the wide application of infrared metamaterial absorbers.

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