Effect of Photo-Isomerization of Azo Dyes on the Photonic Bandgap in Chiral Nematics

Abstract:

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Chiral nematic liquid crystals prepared with Grandjean texture demonstrate a photonic bandgap whose central wavelength is proportional to the pitch length, P, of the liquid crystal and whose width is given by (ne – no)P. We show that methyl red doped chiral nematics undergo a shift in the photonic bandgap upon photo-isomerization. This shift is a result of (1) photo-induced change in anchoring energy on the nematic surface, and (2) change in the natural pitch length from the photo-isomerization of the azo dye.

Info:

Periodical:

Solid State Phenomena (Volumes 181-182)

Edited by:

Yuan Ming Huang

Pages:

257-260

DOI:

10.4028/www.scientific.net/SSP.181-182.257

Citation:

D. Statman et al., "Effect of Photo-Isomerization of Azo Dyes on the Photonic Bandgap in Chiral Nematics", Solid State Phenomena, Vols. 181-182, pp. 257-260, 2012

Online since:

November 2011

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Price:

$35.00

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