A Method of Dynamically Adjusting the Reflection Spectral Bandwidth of a Guided Mode Resonance Filter

A guided-mode resonance and filter technology, which is applied in the fields of optical communication and micro-electromechanical systems, can solve problems such as the size of a single spectral bandwidth and the dynamic adjustment of the spectral bandwidth of a guided-mode resonance filter.

Active Publication Date: 2018-04-13
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method starts with changing the structural parameters of the grating layer or film layer, and can only design a guided-mode resonant filter with a specific bandwidth for specific application requirements. For the same filter structure, only a single spectral bandwidth can be obtained, and cannot be adjusted. Dynamic adjustment of spectral bandwidth of guided mode resonant filter

Method used

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  • A Method of Dynamically Adjusting the Reflection Spectral Bandwidth of a Guided Mode Resonance Filter
  • A Method of Dynamically Adjusting the Reflection Spectral Bandwidth of a Guided Mode Resonance Filter
  • A Method of Dynamically Adjusting the Reflection Spectral Bandwidth of a Guided Mode Resonance Filter

Examples

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Effect test

Embodiment 1

[0020] Example 1 Design of guided mode resonance filter with coupled grating structure

[0021] The guided mode resonant filter is designed with a coupled grating structure. The coupled grating is composed of two identical stacked sub-wavelength gratings with one-half the thickness of the dummy layer. For TM polarized incident light, at Brewster's angle In the vicinity, the electromagnetic field coupling between the upper and lower gratings is changed by controlling the micro / nano-level relative lateral movement of the two gratings, so as to realize the dynamic control of the bandwidth of the reflection spectrum of the guided mode resonance filter.

[0022] The design wavelength and material of the filter can be selected according to actual conditions. For TM polarization, select the design wavelength λ=650nm, and use HfO 2 And SiO 2 Two kinds of high and low refractive index materials, the refractive index is: n H = 1.98, n L = 1.46. The incident medium is air n c =1, the substra...

Embodiment 2

[0023] Embodiment 2 Based on the coupled grating structure to dynamically adjust the bandwidth of the guided mode resonance filter

[0024] Based on the design of the guided-mode resonant filter using the coupled grating structure of Example 1, the vector diffraction theory is used to calculate the reflection filter spectrum curve of the guided-mode resonant coupled grating, and obtain figure 2 From the calculation results, it can be seen that due to the Brewster anti-reflection effect of TM polarization, the sideband reflectivity of the filter is less than 5‰ in the 200nm wavelength range near the design wavelength of 650nm, and the guided mode resonance reflection filtering performance superior.

[0025] in figure 2 Under the parameter conditions of, select different grating traverse coefficients S, for example, S is 0.1, 0.2, 0.3, 0.5, and use vector diffraction theory to calculate the reflection spectrum curve of the guided-mode resonance coupling grating, and get image 3 The...

Embodiment 3

[0026] Example 3 Fine-tuning the incident angle to compensate the peak wavelength shift phenomenon caused by the lateral shift of the grating

[0027] When the coupling grating based on Embodiment 2 is shifted laterally, the equivalent refractive index of the coupling grating will change slightly, resulting in a slight shift in the peak position of the filter with the change of S. In Example 2, the incident angle θ i =55.59°, when S=0, the coupling grating peak corresponds to the design wavelength of 650nm, but when S changes, the peak wavelength will slightly deviate from the design wavelength. For example, S is 0.1, 0.2, 0.3, 0.5, and the peak position is 649.7nm, 649.3nm, respectively , 648.9nm, 649.1nm. For the peak wavelength drift phenomenon caused when S changes, the peak wavelength drift can be compensated by fine-tuning the incident angle.

[0028] For example, for S=0.1, use vector diffraction theory to calculate the relationship between filter reflectivity and incident ...

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Abstract

The invention discloses a method for dynamically controlling the reflection spectrum bandwidth of a guided-mode resonance filter and belongs to the fields of optical communication and micro electro mechanical systems. A coupling grating provided by the invention is composed of double equivalent grating bodies with the thickness one half of the thickness of an absentee layer and stacked vertically, for TM polarized incident light, structural magnetic field distribution is changed nearby a Brewster angle by controlling micro / nanoscale relative lateral movement between the two grating bodies, and continuous control of the reflection spectrum bandwidth of the guided-mode resonance filter is achieved. In the lateral movement process of the grating bodies, a peak wavelength shift phenomenon caused by the relative lateral movement between the grating bodies is not obvious, but the reflection spectrum bandwidth changes remarkably, and excellent anti-reflection filtering characteristics of the filter are kept when the two grating bodies produce the relative lateral movement. By finely adjusting an incidence angle, reflection peak shift caused by the relative lateral movement of the two grating bodies can be compensated.

Description

Technical field [0001] The invention relates to a method for dynamically adjusting the reflection spectrum bandwidth of a guided mode resonance filter, in particular to a method for dynamically adjusting the reflection spectrum bandwidth of a guided mode resonance filter by using a coupling grating, and belongs to the field of optical communication and microelectromechanical systems. Background technique [0002] Guided-mode resonance filter is an optical element that uses guided-mode resonance effect to achieve resonance filtering. This type of filter requires a small number of layers and has superior filtering performance. It is used in laser high reflection systems, polarization systems, light modulators and biological Sensing and other aspects have important application value. In practical applications, the spectral bandwidth is an important performance index of the filter. In order to effectively control the spectral bandwidth of the guided-mode resonance filter, there are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/20
CPCG02B5/203
Inventor 桑田王跃科李俊浪周健宇王睿
Owner JIANGNAN UNIV
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