Photon crystal omnibearing full inverse film

A technology of photonic crystal and all-reflection film, which is applied in the field of reflective film, can solve the problems of large energy loss of light waves, low reflectivity, and decreased reflectivity.

Inactive Publication Date: 2004-11-10
NAT UNIV OF DEFENSE TECH
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  • Abstract
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Problems solved by technology

Although the reflection band of the metal film layer is relatively wide, it can reflect light waves in a specific band of incidence at various angles, but there is a problem of relatively low reflectivity; especially due to absorption, there is still a large loss of light wave energy. question
The dielectric film layer adopts the method of coating a multi-layer dielectric film on the substrate to achieve high-efficiency reflection, but due to t

Method used

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  • Photon crystal omnibearing full inverse film
  • Photon crystal omnibearing full inverse film
  • Photon crystal omnibearing full inverse film

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[0009] The present invention will be further described below in conjunction with accompanying drawing.

[0010] refer to figure 1 , the photonic crystal omni-directional all-reflection film is composed of a substrate and a dielectric film layer, and the dielectric film layer is composed of a periodic structure medium, which belongs to a one-dimensional photonic crystal structure. Two or more media with different refractive indices form a one-dimensional periodic film unit. Here we might as well assume that the two refractive indices are n 1 and n 2 medium composition, then there is

[0011]

[0012] and

[0013] n(x+a)=n(x) (2)

[0014] where h 1 + h 2 =a.

[0015] Suppose the wave vector of the incident light wave is k → = k x e → x + k y ...

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Abstract

The invention is a photon crystal all-direction all-reflecting film. It relates to a field of all-reflecting film able to generate 'forbidden band' for optical wave in a specific wave band to implement all reflection of the incident optical waves at all angles. The all-reflecting film is composed of substrate slice and medium layer; the medium layer is composed of two or many mediums with different refractive indexes, forming an one-dimensional periodical film unit, belonging to an one-dimensional photon crystal structure. For optical waves in specific wave bands, not only it can implement all reflection but the reflectivity has no relation to the incident angles, i.e. it can implement all reflection of the incident optical waves at all angles.

Description

(1) Technical field [0001] The invention relates to the technical field of a reflective film capable of generating a "band gap" for light waves in a specific wavelength band and realizing complete reflection of light waves incident at various angles. (2) Background technology [0002] In the prior art, commonly used reflectors are generally coated with a metal film or a dielectric film to reflect light waves. Although the reflection band of the metal film layer is relatively wide, it can reflect light waves in a specific band of incidence at various angles, but there is a problem of relatively low reflectivity; especially due to absorption, there is still a large loss of light wave energy. question. The dielectric film layer adopts the method of coating a multi-layer dielectric film on the substrate to achieve high-efficiency reflection, but due to the propagation characteristics of light waves in the medium, this high-efficiency reflection can only be used for light waves ...

Claims

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Application Information

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IPC IPC(8): G02B5/08
Inventor 侯静贺军涛陆启生姜宗福程湘爱陈金宝舒柏宏刘泽金赵伊君
Owner NAT UNIV OF DEFENSE TECH
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