Design of polarization-independent two-dimensional binary blazed grating
Received:August 25, 2019  Revised:April 02, 2020  download
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Author NameAffiliationE-mail
ZHU Jia-Cheng School of Optoelectronic Science and Engineering, Soochow University, Suzhou 215006, China
Key Lab of Modern Optical Technologies of Education Ministry of China & Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province, Soochow University, Suzhou 215006, China 
13962250185@163.com 
ZHOU Jian-Kang School of Optoelectronic Science and Engineering, Soochow University, Suzhou 215006, China
Key Lab of Modern Optical Technologies of Education Ministry of China & Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province, Soochow University, Suzhou 215006, China 
 
SHEN Wei-Min School of Optoelectronic Science and Engineering, Soochow University, Suzhou 215006, China
Key Lab of Modern Optical Technologies of Education Ministry of China & Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province, Soochow University, Suzhou 215006, China 
 
Abstract:In order to reduce imaging spectrometer’s polarization sensitivity and improve its quantitative measurement 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 polarization property can be optimized. Through extending the effective medium theory to the two-dimensional pattern, a two-dimensional binary blazed grating with polarization-independent high efficiency on fused silica substrate was designed for wavelength range from 0.6 to 0.8 μm. The grating periods in two orthogonal directions are 3.3 1μm and 0.473 μm, respectively. Simulation results show that, for normal incident light, diffraction efficiencies 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.
keywords:binary blazed grating  polarization-independent  two-dimensional structure  diffraction efficiency
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Copyright:《Journal of Infrared And Millimeter Waves》