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Study on the depolarization grating
Author(s): Quan Liu; Jianhong Wu; Shuangshuang Huang
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Paper Abstract

The depolarization grating is needed particularly for use in imaging spectrometers used in sensing the atmosphere weak CO2 spectral band (1595nm - 1625 nm) at spectral resolution in the order of 0.1 nm whilst ensuring a high efficiency for both TE and TM polarizations. The diffraction characteristics of the depolarization grating have been investigated by using rigorous coupled wave theory. The simulation results show: the groove depth and duty cycle of the depolarization grating must be controlled within the range of 730nm-780nm and 0.3-0.37 respectively, in order to guarantee the 1 order diffraction efficiency is over 70% for both TE and TM polarizations at the atmosphere weak CO2 spectral band. The depolarization grating with the period of 869nm in a fused-silica substrate of 120 mm × 97mm will be fabricated by holographic lithography - ion beam etching in late 2018.

Paper Details

Date Published: 12 March 2019
PDF: 6 pages
Proc. SPIE 11023, Fifth Symposium on Novel Optoelectronic Detection Technology and Application, 110233A (12 March 2019); doi: 10.1117/12.2521993
Show Author Affiliations
Quan Liu, Soochow Univ. (China)
Jianhong Wu, Soochow Univ. (China)
Shuangshuang Huang, Soochow Univ. (China)

Published in SPIE Proceedings Vol. 11023:
Fifth Symposium on Novel Optoelectronic Detection Technology and Application
Qifeng Yu; Wei Huang; You He, Editor(s)

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