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Proceedings Paper

Non-exhibition of Bragg phenomenon by chevronic sculptured thin films
Author(s): Vikas Vepachedu; Patrick D. McAtee; Akhlesh Lakhtakia
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Paper Abstract

The unit cell of a chevronic sculptured thin film (ChevSTF) comprises two identical columnar thin films (CTFs) except that the nanocolumns of the first are oriented at an angle Χ and nanocolumns of the second are oriented at an angle π − χ with respect to the interface of the two CTFs. A ChevSTF containing 10 unit cells was fabricated and its planewave reflectance and transmittance spectrums of this ChevSTF were measured. Despite its structural periodicity, the ChevSTF did not exhibit the Bragg phenomenon. Theoretical calculations with the CTFs modeled as biaxial dielectric materials indicated that the Bragg phenomenon would not be manifested for normal and near-normal incidence, but vestigial manifestation was possible for sufficiently oblique incidence.

Paper Details

Date Published: 30 August 2017
PDF: 6 pages
Proc. SPIE 10356, Nanostructured Thin Films X, 103560W (30 August 2017); doi: 10.1117/12.2272835
Show Author Affiliations
Vikas Vepachedu, The Pennsylvania State Univ. (United States)
Patrick D. McAtee, The Pennsylvania State Univ. (United States)
Akhlesh Lakhtakia, The Pennsylvania State Univ. (United States)


Published in SPIE Proceedings Vol. 10356:
Nanostructured Thin Films X
Yi-Jun Jen; Akhlesh Lakhtakia; Tom G. Mackay, Editor(s)

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