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NCUEIR > College of Science > Graduate Institute of Photonics Technologies > Periodical Articles > Item 987654321/15078

Please use this identifier to cite or link to this item: http://ir.ncue.edu.tw/ir/handle/987654321/15078

Title:	Dynamic Pattern Formation and Beam-Steering Characteristics of Cholesteric Gratings
Authors:	Fuh, Andy Ying-Guey;Lin, Chi-Huang;Huang, Chi-Yen
Contributors:	光電科技研究所
Keywords:	Cholesteric grating;Beam steering;Freedericksz transition
Date:	2002-01
Issue Date:	2013-01-07T02:10:17Z
Publisher:	The Japan Society of Applied Physics
Abstract:	The dynamic pattern formation and the beam-steering characteristics of cholesteric gratings were studied. Films with a planar cholesteric texture and various thickness to pitch length ratios (d/p) were fabricated. An optical microscope was used to observe the stripe patterns of the cholesteric gratings formed by applying a voltage to the planar films. The micrographs showed that the cholesteric gratings were formed in two different ways, depending on the sample's d/p ratio. For samples with 1/2≤d/p≤1.0, the grating stripes simultaneously appeared across the whole sample, and the contrast of the stripes increased with time during formation. For films with d/p≥1.5, the stripes were initiated near the edges, and near the defects on the substrates, and then slowly extended to the whole sample along the rubbing direction. The diffraction measurements showed that the diffracted beams could be steered either electrically or optically only for the latter type of film. These results can be well explained theoretically.
Relation:	Jpn. J. Appl. Phys., 41(1): 211-218
Appears in Collections:	[Graduate Institute of Photonics Technologies] Periodical Articles

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