30 August 2017 Non-exhibition of Bragg phenomenon by chevronic sculptured thin films
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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.
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Vikas Vepachedu, Patrick D. McAtee, Akhlesh Lakhtakia, "Non-exhibition of Bragg phenomenon by chevronic sculptured thin films", Proc. SPIE 10356, Nanostructured Thin Films X, 103560W (30 August 2017); doi: 10.1117/12.2272835; https://doi.org/10.1117/12.2272835
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