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Guided mode resonance filter

A guided-mode resonance and filter technology, applied in the field of optical communication, can solve the problems of unfavorable popularization and application of guided-film resonant filters, increase the difficulty of filter manufacturing process, etc., and achieve the effect of simple structure and flexible design.

Active Publication Date: 2018-11-30
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The traditional guided mode resonant grating has a multi-layer film structure, and the sudden change in the refractive index between the film layers has brought many negative effects on the filter performance.
A single graded material grating realizes a guided film resonant filter (CN106772741A) reports the use of a graded refractive index material instead of a multilayer film, thereby overcoming the defects of the traditional guided film resonant grating. However, the introduction of the graded refractive index material makes the manufacturing process of the filter Increased difficulty is not conducive to the popularization and application of guided film resonant filters

Method used

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Embodiment 1

[0042] Embodiment 1, the guided mode resonant filter proposed by the present invention includes:

[0043] Identical dielectric rods uniformly distributed in a single layer, such as figure 1 as shown in (a);

[0044] Among them, the cross-sectional radius of the dielectric rod is r, and the distance between the dielectric rods is d. The change of both will affect the size of the resonance wavelength λ. The smaller d is, the smaller the resonance wavelength λ will be. The change of r will affect the equivalent of the structure. Refractive index, and the change of equivalent refractive index will cause the change of resonance wavelength λ); n is the dielectric constant of the dielectric rod, n o It is the dielectric constant of the medium around the dielectric rod, and both satisfy n>n o .

[0045] If the layer of dielectric column structure is equivalent to a layer of uniform dielectric waveguide, then the thickness of the waveguide layer is 2r, and its equivalent refractive ...

Embodiment 2

[0051] Embodiment 2, the guided mode resonant filter proposed by the present invention includes:

[0052]Multi-layer dielectric rods; wherein, the dielectric constants of the dielectric rods are n, and the dielectric rods are distributed in the dielectric constant of n o In the medium, both satisfy n>n o ; Dielectric rods located in the same layer have the same cross-sectional radius r, and they are evenly distributed, that is, the spacing d is the same; Dielectric rods located in different layers have different cross-sectional radii, thereby achieving multiple different resonance wavelengths λ; each layer of dielectric rods has the same The spacing d and layer spacing h.

[0053] In this embodiment, when the number of layers of the dielectric rod is 2, the structure of the guided mode resonant filter is as follows figure 2 (a) shown. Among them, the radius of the first layer of dielectric rod is r 1 =105nm, the radius of the second layer of dielectric rod is r 2 =110nm,...

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Abstract

The invention provides a guided mode resonance filter. The guided mode resonance filter comprises homogeneous dielectric rods uniformly distributed in a single layer. The dielectric constant of each homogeneous dielectric rod is arranged to be n; and dielectric constant of media around the dielectric rods is arranged to be n<o>, wherein n>n<o>. The section radius of the dielectric rod is r. Separation distance between two dielectric rods is d. The uniformly distributed homogeneous dielectric rods are regarded as an equivalent waveguide. The operating wavelength of the guided mode resonance filter is decided by the guided mode resonance effect. The guided mode resonance filter has the advantages that the structure is simple and the design is flexible. The guided mode resonance filter has excellent performance parameters. The reflectivity rate of resonant wavelength is 100%, the bandwidth less than 3nm, the sideband reflectivity rate is less than 0.5%, and the resonant wavelength is tunable.

Description

technical field [0001] The invention relates to optical filtering technology, in particular to an optical element for realizing resonance filtering based on a guided mode resonance effect, and belongs to the field of optical communication. Background technique [0002] Guided mode resonance filter is an optical component that utilizes the guided mode resonance effect to realize resonance filtering. The guided mode resonance effect occurs in a thin film structure with a diffraction grating layer. Its most prominent feature is the effective energy exchange between the reflected wave and the transmitted wave in a very narrow resonance wavelength range, resulting in nearly 100% transmission or reflection. The characteristics make the guided mode resonance structure widely used to make high-efficiency reflection / transmission filters, and become an important component of optical systems such as laser high-reflection systems, polarization systems, optical imaging systems, biosensor...

Claims

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Application Information

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IPC IPC(8): G02B5/20
CPCG02B5/203
Inventor 董鹏高华魏果果
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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