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Journal of Nanophotonics

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 90 deg-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. In an attempt to build a tunable filter, 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: 9 May 2013
PDF: 11 pages
J. Nanophoton. 7(1) 073591 doi: 10.1117/1.JNP.7.073591
Published in: Journal of Nanophotonics Volume 7, Issue 1
Show Author Affiliations
Hadar K. Reisman, Ben-Gurion Univ. of the Negev (Israel)
Drew P. Pulsifer, The Pennsylvania State Univ. (United States)
Raul J. Martin-Palma, The Pennsylvania State Univ. (United States)
Akhlesh Lakhtakia, The Pennsylvania State Univ. (United States)
Roman S. Dąbrowski, Military Univ. of Technology (Poland)
Ibrahim Abdulhalim, Ben-Gurion Univ. of the Negev (Israel)

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