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Proceedings Paper

Liquid crystal gratings from nematic to blue phase
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Paper Abstract

Some of our recent progress on liquid crystal (LC) gratings, from nematic to blue phase, is reviewed in this invited talk. The first kind of grating is fabricated by periodically adjusting the LC directors to form alternate micro phase retarders and polarization rotators in a cell placed between crossed polarizers. The second one is demonstrated by means of photoalignment technique with alternate orthogonal homogeneously-aligned domains. To improve the response time of the gratings, several approaches are also proposed by using dual-frequency addressed nematic LC, ferroelectric LC and blue phase LC, which shows great performance including high transmittance, polarization independency and submillisecond response. At last, to obtain other controllable LC microstructures rather than simple 1D/2D gratings, we develop a micro-lithography system with a digital micro-mirror device as dynamic mask forms. It may instantly generate arbitrary micro-images on photoalignment layers and further guides the LC molecule orientations. Besides normal phase gratings, more complex patterns such as quasicrystal structures are demonstrated. Some new applications such as tunable multiport optical switching and vector beam generations are expected.

Paper Details

Date Published: 11 October 2012
PDF: 12 pages
Proc. SPIE 8475, Liquid Crystals XVI, 84750Q (11 October 2012); doi: 10.1117/12.929260
Show Author Affiliations
Yan-qing Lu, Nanjing Univ. (China)
Wei Hu, Nanjing Univ. (China)
Xiao-wen Lin, Nanjing Univ. (China)
Abhishek Srivastava, Hong Kong Univ. of Science and Technology (Hong Kong, China)
Vladimir G. Chigrinov, Hong Kong Univ. of Science and Technology (Hong Kong, China)

Published in SPIE Proceedings Vol. 8475:
Liquid Crystals XVI
Iam Choon Khoo, Editor(s)

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