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Visible-Near Infrared Broadband Absorber Based on Porous Alumina and Preparation Method

A technology of porous alumina and absorber, which is applied in the direction of instruments, optical components, optics, etc., can solve the problems that the near-infrared broadband absorber has not been proposed, and achieve the effect of low cost, reduced cost and simple preparation

Active Publication Date: 2018-11-09
上海高能煜镀科技有限公司
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  • Claims
  • Application Information

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Problems solved by technology

[0005] Although studies and applications based on the combination of porous alumina and atomic layer deposition have been continuously proposed, as far as we know, visible-near-infrared broadband absorbers can be prepared by filling ultra-thin metal films in porous alumina using atomic layer deposition. research has never been presented

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  • Visible-Near Infrared Broadband Absorber Based on Porous Alumina and Preparation Method

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Embodiment Construction

[0040] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0041] Such as figure 1 As shown, a visible-near-infrared broadband absorber based on porous alumina includes a substrate 1, a porous alumina template 2, an iridium film 3 and a high-low refractive index medium anti-reflection film system 4, and the back of the substrate 1 is arranged with a double pass The porous alumina template 2 is covered with a thin layer of iridium film 3, and the front of the substrate 1 is provided with a visible-near-infrared wide band high and low refractive index medium anti-reflection film system 4. The substrate 1 is made of glass, and the light is incident from the front of the absorber where the anti-reflection film system is arranged.

[0042] The diameter of the holes in the porous alumina template 2 is generally 40-90nm, more preferably 50-70nm, the hole spacing is 50-150nm, more preferably 90-110nm, the hole spacing is gr...

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Abstract

The invention discloses a porous-alumina-based visible near infrared broadband absorber. The porous-alumina-based visible near infrared broadband absorber includes a substrate, wherein a high-low refractive index medium anti-reflection film system is arranged on the front side of the substrate; a bipass porous alumina template is arranged on the back side of the substrate; and the porous alumina template is covered by a metal thin film. The invention also discloses a preparation method of the above absorber. The porous-alumina-based visible near infrared broadband absorber and the preparation method thereof utilize the porous alumina template and use the layer of thin high absorbability metal structure covered on the porous alumina to realize strong resonance between the medium and the metal on the bottom surface and the side wall of the porous alumina holes so as to realize absorption of visible near infrared wave band broadband. The porous-alumina-based visible near infrared broadband absorber has the advantages of being simple in structure, being simple and convenient in preparation, being low in cost, being convenient for mass and batched production. Therefore, the porous-alumina-based visible near infrared broadband absorber is expected to be widely applied to the fields of elimination of stray light, space detection, imaging, photo-thermal conversion and electromagnetic absorption.

Description

technical field [0001] The invention relates to an optical element, in particular to a visible-near-infrared broadband absorber and a preparation method thereof, which can be applied to the fields of stray light elimination, space detection, imaging, photothermal conversion, electromagnetic absorption and the like. Background technique [0002] Visible-near-infrared broadband absorbers have been extensively studied due to their large application requirements in the fields of stray light elimination, space detection, imaging, photothermal conversion, and electromagnetic absorption. In recent years, with the in-depth study of subwavelength grating electromagnetic theory and the development of micro-nano processing technology, researchers have proposed various absorbers of artificial electromagnetic structures for electromagnetic waves composed of sub-wavelength micro-nano structures. Among them, Chen et al. used the droplet evaporation method to form randomly arranged gold nan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/00
CPCG02B5/003
Inventor 沈伟东杨陈楹方波章岳光刘旭
Owner 上海高能煜镀科技有限公司
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