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Crystals 2017, 7(11), 338; doi:10.3390/cryst7110338

Ultrafast Photoalignment: Recording a Lens in a Nanosecond

1
BEAM Engineering for Advanced Measurements Co., 1300 Lee Rd., Orlando, FL 32810, USA
2
Air Force Research Laboratory, Wright-Patterson Air Force Base, OH 45433, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Vladimir Chigrinov
Received: 9 October 2017 / Revised: 31 October 2017 / Accepted: 31 October 2017 / Published: 3 November 2017
(This article belongs to the Special Issue Micro and Nano Patterned Substrates for Liquid Crystal Alignment)
View Full-Text   |   Download PDF [3470 KB, uploaded 3 November 2017]   |  

Abstract

Liquid crystals can be photoaligned with a single nanosecond pulse acting on thin photoanisotropic coatings on the cell substrates. This phenomenon was demonstrated for pulses of 532 nm and 355 nm wavelengths (second and the third harmonics of a Nd:YAG laser). Direct printing of liquid crystal cycloidal diffractive waveplates and diffractive waveplate lenses characterized by high spatial frequencies required only a mJ energy. The liquid crystal alignment dynamics reveal a fast component related to photoalignment of molecules within the photoanisotropic layer and a slower component related to alignment of the liquid crystal within the cell. View Full-Text
Keywords: photoalignment; diffractive waveplates; liquid crystals; liquid crystal polymers; flat lenses; diffractive optics; geometrical phase optics photoalignment; diffractive waveplates; liquid crystals; liquid crystal polymers; flat lenses; diffractive optics; geometrical phase optics
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Serak, S.V.; Bunning, T.J.; Tabiryan, N.V. Ultrafast Photoalignment: Recording a Lens in a Nanosecond. Crystals 2017, 7, 338.

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