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Wavelength selective mirror using resonant reflection in a two-dimensional photonic crystal

利用二维光子晶体中的谐振反射的波长选择镜

基本信息

批准号：
13650042
负责人：
KIKUTA Hisao
金额：
$ 1.98万
依托单位：
Osaka Prefecture University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650042/
关键词：
Optical band-pass filter Moth eve structure Guided-mode resonant grating filter Low sideband Optical thin film Subwavelength structured surface Diffraction grating Waveguide フォトニック結晶反射防止共鳴反射波長フィルター

项目摘要

We proposed a new structure of guided-mode resonant grating (GMRG) filters with low sideband reflectance. This GMRG filter consists of a high-index thin film on an antireflective structured surface called "moth-eye structure". Since the high-index film undulates along the surface structure, the film acts as a modulated optical waveguide. An incident light wave satisfying a resonant condition is reflected by the GMRG filter, and nonresonant light waves pass through the filter. This GMRG filter is valid for reducing reflection of nonresonant light waves in a wide spectral range.The resonant reflection of this new filter was investigated by numerical calculation based on an electromagnetic grating analysis. In the case of a triangular antireflective surface structure whose thickness is 2x greater than its period, the sideband reflectance for nonresonant light waves was lower than 0.5% for TM-polarized light in a wade range of wavelength.We also fabricated a GMRG filter on an antireflective surface structure. A base substrate was a triangular surface structure of fused silica with a period of 333 nm and a height of 〜700 nm. TiO_2 thin film of 100 nm thick was spattered on the moth-eye surface. The refractive indices of the fused silica substrate and the TiO_2 thin film are 1.47 and 2.3. This GMRG filter occurs a resonant reflection at wavelength of 680 nrn with FWHM (full-wide at half maximum) of 0.7 nm. However, the sideband reflectance was lower than 4%.

提出了一种具有低边带反射率的导模谐振光栅滤波器的新结构。该GMRG滤光片由一个高折射率薄膜组成，该薄膜位于被称为“蛾眼结构”的抗反射结构表面上。由于高折射率膜沿着表面结构起伏，因此该膜充当调制光波导。满足共振条件的入射光波被GMRG滤波器反射，并且非共振光波通过滤波器。该滤波器能有效地抑制宽光谱范围内的非共振光波的反射，基于电磁光栅理论，通过数值计算研究了该滤波器的共振反射特性。在厚度为周期2倍的三角形抗反射表面结构的情况下，在宽波长范围内，对TM偏振光的非共振光波的边带反射率低于0.5%，我们还在抗反射表面结构上制作了GMRG滤波器。基础衬底是具有333 nm的周期和10700 nm的高度的熔融石英的三角形表面结构。在蛾眼表面溅射100 nm厚的TiO_2薄膜。熔融石英衬底和TiO_2薄膜的折射率分别为1.47和2.3。该GMRG滤波器在680 nm波长处发生共振反射，半高宽（FWHM）为0.7 nm。然而，边带反射率低于4%。