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Polarization-dependent diffractive optical elements based on photoalignment of liquid crystals
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Paper Abstract

Diffractive optical elements (DOEs), with attractive features such as excellent performance and compact configuration, are now becoming increasingly important to a wide range of optical system applications. In this paper, we have used the patterned photoalignment method to produce switchable gratings. It is found that these gratings combine good optical quality with very fast dynamical response at very low driving voltage. A sub-millisecond steering with active FLC as a polarization selector and passive polarization grating (PG) as a diffractive element. A systematic analysis is conducted from the device fabrication to the element working mechanism with their potential problems and corresponding solutions included. The polymerizable liquid crystal PG shows compact size, light weight, robustness, and low cost. Switching time of 82μs is realized by binary switching between two circular polarizations before incident on PG utilizing FLC driven by two electrical polarities. Overall efficiency of 95.7% is achieved with steering angle of 17.66° by 1064nm laser.

Paper Details

Date Published: 6 September 2019
PDF: 8 pages
Proc. SPIE 11132, Polarization Science and Remote Sensing IX, 111320X (6 September 2019); doi: 10.1117/12.2528298
Show Author Affiliations
Qi Guo, Beihang Univ. (China)
Kexin Yan, Beihang Univ. (China)
Ruotong Wu, Beihang Univ. (China)
Huijie Zhao, Beihang Univ. (China)
V. G. Chigrinov, Hong Kong Univ. of Science and Technology (Hong Kong, China)
H. S. Kwok, Hong Kong Univ. of Science and Technology (Hong Kong, China)


Published in SPIE Proceedings Vol. 11132:
Polarization Science and Remote Sensing IX
Julia M. Craven; Joseph A. Shaw; Frans Snik, Editor(s)

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