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Multi-wavelength near infrared absorber insensitive to polarization

An absorber and near-infrared technology, applied in the infrared field, can solve the problem that the working wavelength cannot meet the system anti-interference, etc., and achieve the effect of polarization insensitive incident angle, easy implementation, and wide incident angle.

Inactive Publication Date: 2019-02-19
ANYANG NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, researchers have proposed a variety of metamaterial absorber structures, but the working wavelengths of these absorber structures are mainly limited to single, double or three wavelengths. The electromagnetic wave absorption can no longer meet the requirements of system anti-interference.

Method used

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  • Multi-wavelength near infrared absorber insensitive to polarization
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  • Multi-wavelength near infrared absorber insensitive to polarization

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Embodiment Construction

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] The multi-wavelength metamaterial absorber of the present invention is an infinite periodic structure, including a plurality of absorbing units arranged continuously.

[0024] like figure 1 , 2 , 3, the described absorbing unit comprises: substrate (1), gold film (2), gold nano cavity (21); wherein, gold film (2) is close to the upper surface of substrate (1); The gold nano cavity (21) is a "ten" shaped groove, located in the center of the structural unit, carved from the upper surface of the gold film (2) to a certain depth in the gold film (2) but not penetrated; the metal nano cavity The cavity (21) is filled with lossless electromagnetic wave material.

[0025] As an example, the structural size parameters of each absorption unit are as follows: lattice period P=310 nanometers; the thickness t=1000 nanometers of the gold...

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Abstract

The invention discloses a multi-wavelength near infrared absorber insensitive to polarization, which belongs to the technical field of near infrared metamaterial absorber, and solves a problem of highabsorption of electromagnetic waves only in one, two or three wavelengths. The absorber consists of a plurality of absorber units. Each absorber unit comprises: a substrate (1), a gold film (2), anda metal nanocavity (21). The gold film (2) is tightly attached to the upper surface of the substrate (1). The metal nanocavity (21) is a cross-shaped groove, is located at the center of the structure,and is etched from the upper surface of the gold film (2) to a certain depth into the gold film (2) but not penetrates the film. The metal nanocavity (21) is filled with electromagnetic wave materials. The near-infrared absorber has the characteristics of simple structure, high absorption rate, polarization insensitive, and wide angle of incidence, and has six absorption peak points.

Description

technical field [0001] The invention relates to the field of infrared technology, in particular to a polarization-insensitive multi-wavelength metamaterial absorber. Background technique [0002] In the field of national defense and military affairs, in order to prevent weapons and equipment from being discovered and attacked by the enemy and improve the tactical level of military equipment, radar stealth technology has become increasingly important and has been highly valued by countries all over the world. Microwave absorption is the key to radar stealth technology, but traditional wave-absorbing materials have disadvantages such as bulky, heavy, and low performance, which are greatly restricted in application. Absorbers based on metamaterials have the advantages of thin thickness, light weight, and strong absorption, and have important application prospects in the fields of microbolometers, thermal electron photodetectors, infrared stealth, and radiation refrigeration. L...

Claims

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Application Information

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IPC IPC(8): G02B5/00
CPCG02B5/003
Inventor 胡丹王红燕汤振杰
Owner ANYANG NORMAL UNIV
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