Special Section on Nanostructured Thin Films: Fundamentals and Applications

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

[+] Author Affiliations
Stephen E. Swiontek

Pennsylvania State University, Department of Engineering Science and Mechanics, 212 EES Building, University Park, Pennsylvania 16802

Drew P. Pulsifer

Pennsylvania State University, Department of Engineering Science and Mechanics, 212 EES Building, University Park, Pennsylvania 16802

Jian Xu

Pennsylvania State University, Department of Engineering Science and Mechanics, 212 EES Building, University Park, Pennsylvania 16802

Akhlesh Lakhtakia

Pennsylvania State University, Department of Engineering Science and Mechanics, 212 EES Building, University Park, Pennsylvania 16802

J. Nanophoton. 7(1), 073599 (Mar 11, 2013). doi:10.1117/1.JNP.7.073599
History: Received September 24, 2012; Revised November 27, 2012; Accepted November 28, 2012
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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.

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© 2013 Society of Photo-Optical Instrumentation Engineers

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", J. Nanophoton. 7(1), 073599 (Mar 11, 2013). ; http://dx.doi.org/10.1117/1.JNP.7.073599


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