红外与毫米波学报2020，Vol.39Issue(2)：149-156,8.DOI:10.11972/j.issn.1001-9014.2020.02.003
消偏振二维二元闪耀光栅设计
Design of polarization-independent two-dimensional binary blazed grating
摘要
Abstract
In order to reduce imaging spectrometer's polarization sensitivity and improve its quantitative measure-ment accuracy of target' s spectral radiance,a transmission polarization-independent two-dimensional binary blazed grating was proposed. It consists of periodical groove units in both orthogonal directions and there contains 7 sub-periods within one groove unit. Duty cycles of sub-periods are independent in two orthogonal directions,so that the effective index of both TE and TM polarizations can be modulated simultaneously,and the grating's po-larization property can be optimized. Through extending the effective medium theory to the two-dimensional pat-tern,a two-dimensional binary blazed grating with polarization-independent high efficiency on fused silica sub-strate was designed for wavelength range from 0. 6 to 0. 8 μm. The grating periods in two orthogonal directions are 3. 31μm and 0. 473 μm,respectively. Simulation results show that,for normal incident light,diffraction ef-ficiencies of TE and TM polarizations at reference wavelength 0. 7 μm are 78. 4％ and 78. 3％,respectively. Within wavelength range from 0. 6 to 0. 8 μm,diffraction efficiencies of TE and TM polarizations are both above 70％ and the degree of polarization is below 2. 6％. Compared with one-dimensional binary blazed grating,the two-dimensional grating has the advantages of high diffraction efficiency,low degree of polarization and easier manufacture. It is expected to be used in grating-type imaging spectrometers.关键词
二元闪耀光栅/消偏振/二维结构/衍射效率Key words
binary blazed grating/polarization-independent/two-dimensional structure/diffraction efficiency分类
数理科学引用本文复制引用
朱嘉诚,周建康,沈为民..消偏振二维二元闪耀光栅设计[J].红外与毫米波学报,2020,39(2):149-156,8.基金项目
Supported by the National Key Research and Development Program of China(2016YFB0500501-02),Priority Academic Program Devel-opment of Jiangsu Higher Education Institutions(PAPD) （2016YFB0500501-02）
