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Proceedings Paper

Sub-wavelength metal polarization gratings array used in polarization imaging
Author(s): Peng Sun; Quan Liu; Jianhong Wu
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Paper Abstract

Polarization imaging is a powerful tool to observe hidden information from an observed object, for instance, degree of polarization, polarization azimuth and polarization ellipticity. According to the request of the visible light polarization imaging, a metal sub-wavelength polarization gratings array was designed based on FDTD method. And its principle was analyzed by effective medium theory. The effects of metal thickness and duty ratio on the TM and TE polarization transmission efficiency as well as the extinction ratio was analyzed by FDTD method when the grating's period is 200nm and 250nm, and the metal is Al. When the metal sub-wavelength polarization gratings array works in normal incidence, its TM transmission efficiency are more than 45%, and the extinction ratios are more than 3.5×103 in all visible light spectrum. Numerical results and theoretical analysis show that the designed metal sub-wavelength polarization gratings array is a polarizer with high TM polarization transmission efficiency and high extinction ratios.

Paper Details

Date Published: 17 November 2010
PDF: 10 pages
Proc. SPIE 7848, Holography, Diffractive Optics, and Applications IV, 78482L (17 November 2010); doi: 10.1117/12.870299
Show Author Affiliations
Peng Sun, Soochow Univ. (China)
Quan Liu, Soochow Univ. (China)
Jianhong Wu, Soochow Univ. (China)


Published in SPIE Proceedings Vol. 7848:
Holography, Diffractive Optics, and Applications IV
Yunlong Sheng; Chongxiu Yu; Linsen Chen, Editor(s)

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