Metal medium period film constitutive omni- angle transmission filters

A metal dielectric and dielectric thin film technology, applied in the field of optical filters, can solve the problems of limited application, inability to efficiently achieve enhancement and suppression, etc., and achieve the effect of low production cost and a wide range of material selection.

Inactive Publication Date: 2008-09-10
ZHEJIANG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

However, because 1DPC is not a complete bandgap PC, it cannot efficiently realize

Method used

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  • Metal medium period film constitutive omni- angle transmission filters
  • Metal medium period film constitutive omni- angle transmission filters
  • Metal medium period film constitutive omni- angle transmission filters

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Embodiment Construction

[0012] Such as figure 1 As shown, the all-angle transmission filter composed of metal dielectric periodic films includes a glass substrate 1, a dielectric film 2, and a metal film 3, and a multi-layer dielectric film 2 and a multi-layer metal film 3 are arranged at intervals on the glass substrate 1, wherein the first The first layer and the last layer are both dielectric films 2, the thickness of the dielectric film is 55-80nm, the thickness of the metal film is 25-45nm, the thickness of the first layer and the last layer of the dielectric film 2 is 1 / 2 of the thickness of the dielectric film 2 .

[0013] The period of the film layer along the Z direction d=90nm, the dielectric material is ZnS, the refractive index is 2.4, and the thickness is 60nm, the metal material is Ag, and the thickness is 30nm. First, the Drude model is used for the metal material, and these parameters are calculated for the next-dimensional metal medium The energy band diagram and equifrequency lines...

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Abstract

The invention discloses a full angle transmission filter composed of a metal medium cycle membrane, comprising a glass basal plate, a medium membrane and a metal membrane; a plurality layers of medium membranes and a plurality layers of metal membranes are alternately arranged on the glass basal plate, wherein, the first layer and the last layer are medium membranes, the thickness of the medium membrane is 55 to 88nm, the thickness of the metal membrane is 25 to 45nm and the thickness of the first layer of membrane and the last layer of membrane is one second of the thickness of the medium membrane. The invention adopts traditional multi-layer membranes to establish novel full angle transmission filter and the concept of flat chromatic dispersion equal frequency line in the band theory is utilized to expand the scope of incident angle of the filter, which leads a one-dimensional metal medium periodic structural membrane filter to have the property of full angle. As the transmission filter of the invention has the advantages of full angle filtering property, relatively high transmission rate, long cutting band, and wide scope of material selection, the required design of the frequency band can be realized and the manufacture cost is low, etc.

Description

technical field [0001] The invention relates to an optical filter, in particular to an all-angle transmission optical filter composed of a metal medium periodic thin film. Background technique [0002] The research on photonic crystal (PC) has become an important frontier research in the world. Among them, one-dimensional (1D) PC is very similar to traditional periodic structure thin films, can be fabricated by traditional thin film methods, and is relatively easy to realize applications, so it has attracted much attention. However, because 1DPC is not a complete bandgap PC, it cannot efficiently realize the enhancement and suppression of light emission, which limits its application. In recent years, the main research focus of 1DPC is the full-angle high-reflection structure, and the use of metal materials to replace one of the dielectric materials to form a 1D metal dielectric periodic structure, which utilizes the unique properties of metal materials and realizes negative ...

Claims

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Application Information

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IPC IPC(8): G02B5/20
Inventor 张锦龙刘旭郭婷沈伟东
Owner ZHEJIANG UNIV
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