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Journal of Nanophotonics

Suppression of circular Bragg phenomenon in chiral sculptured thin films produced with simultaneous rocking and rotation of substrate during serial bideposition
Author(s): Stephen E. Swiontek; Drew P. Pulsifer; Jian Xu; Akhlesh Lakhtakia
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Paper Abstract

Chiral sculptured thin films (STFs) produced by substrate rotation during physical vapor deposition exhibit the circular Bragg phenomenon, whereby normally incident left- and right-circularly polarized plane waves are discriminated in a spectral regime called the circular Bragg regime. Theory had predicted that substrate rocking, in synchrony with substrate rotation, during deposition could suppress the propensity to exhibit the circular Bragg phenomenon. Therefore chiral STFs of a dielectric material were fabricated with/without substrate rocking, and their transmittance spectrums for incident linearly and circularly polarized plane waves were measured. With sufficient rocking amplitude, the discrimination between incident left- and right-circularly polarized light nearly vanished, whereas a Bragg phenomenon for all normally incident plane waves was observed. Thus, chiral STF technology can be used to produce both ordinary and circular-polarization Bragg filters.

Paper Details

Date Published: 11 March 2013
PDF: 12 pages
J. Nanophoton. 7(1) 073599 doi: 10.1117/1.JNP.7.073599
Published in: Journal of Nanophotonics Volume 7, Issue 1
Show Author Affiliations
Stephen E. Swiontek, The Pennsylvania State Univ. (United States)
Drew P. Pulsifer, The Pennsylvania State Univ. (United States)
Jian Xu, The Pennsylvania State Univ. (United States)
Akhlesh Lakhtakia, The Pennsylvania State Univ. (United States)

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