Suppression of circular Bragg phenomenon in chiral sculptured thin films produced with simultaneous rocking and rotation of substrate during serial bideposition

Stephen E. Swiontek; Drew P. Pulsifer; Jian Xu; Akhlesh Lakhtakia

doi:10.1117/12.928867

10 October 2012 Suppression of circular Bragg phenomenon in chiral sculptured thin films produced with simultaneous rocking and rotation of substrate during serial bideposition

Stephen E. Swiontek, Drew P. Pulsifer, Jian Xu, Akhlesh Lakhtakia

Author Affiliations +

Proceedings Volume 8465, Nanostructured Thin Films V; 846514 (2012) https://doi.org/10.1117/12.928867
Event: SPIE NanoScience + Engineering, 2012, San Diego, California, United States

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, ZnSe chiral STFs 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.

Citation Download Citation

Stephen E. Swiontek, Drew P. Pulsifer, Jian Xu, and Akhlesh Lakhtakia "Suppression of circular Bragg phenomenon in chiral sculptured thin films produced with simultaneous rocking and rotation of substrate during serial bideposition", Proc. SPIE 8465, Nanostructured Thin Films V, 846514 (10 October 2012); https://doi.org/10.1117/12.928867

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KEYWORDS

Thin films

Transmittance

Bromine

Linear polarizers

Modulation

Contrast transfer function

Glasses

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