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Proceedings Paper

On alignment of nematic liquid crystals infiltrating chiral sculptured thin films
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Paper Abstract

A structurally right-handed chiral sculptured thin film (STF) with a central 90º-twist defect was made by thermal evaporation of chalcogenide glass and the use of a serial bi-deposition process to exhibit a narrowband hole in the spectrum of the right-circularly polarized light reflected when right-circularly polarized light is normally incident on the chiral STF. The chiral STF was then infiltrated with a highly birefringent nematic liquid crystal (LC), which caused a linear reflectance peak to redshift by ~350 nm, but the circular Bragg phenomenon exhibited by the uninfiltrated chiral STF was greatly diminished owing to the similarity in the constitutive properties of the LC and the chalcogenide glass. No temperature dependence of the shifted peak was observed, which provided clear evidence that the LC molecules are not ordered inside the chiral STF but are randomly aligned instead.

Paper Details

Date Published: 10 October 2012
PDF: 8 pages
Proc. SPIE 8465, Nanostructured Thin Films V, 84651E (10 October 2012); doi: 10.1117/12.964414
Show Author Affiliations
Hadar Krupsky Reisman, Ben-Gurion Univ. of the Negev (Israel)
Drew P. Pulsifer, The Pennsylvania State Univ. (United States)
Raúl J. Martín-Palma, The Pennsylvania State Univ. (United States)
Akhlesh Lakhtakia, The Pennsylvania State Univ. (United States)
Roman Dąbrowski, Military Univ. of Technology (Poland)
Ibrahim Abdulhalim, Ben-Gurion Univ. of the Negev (Israel)

Published in SPIE Proceedings Vol. 8465:
Nanostructured Thin Films V
Tom G. Mackay; Yi-Jun Jen; Raúl J. Martín-Palma, Editor(s)

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