Non-exhibition of Bragg phenomenon by chevronic sculptured thin films: experiment and theory

Open Access
Author:
Vepachedu, Vikas
Area of Honors:
Engineering Science
Degree:
Bachelor of Science
Document Type:
Thesis
Thesis Supervisors:
  • Dr. Akhlesh Lakhtakia, Thesis Supervisor
  • Dr. Lucas Passmore, Honors Advisor
Keywords:
  • sculptured thin films
  • Bragg phenomenon
  • Bragg mirror
  • periodicity
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 chi and nanocolumns of the second are oriented at an angle pi - chi with respect to the interface of the two CTFs. A ChevSTF containing 10 unit cells was fabricated using resistive-heating physical vapor deposition of zinc selenide. Planewave reflectance and transmittance spectrums of this ChevSTF were measured for a wide variety of incidence conditions over the 500--900-nm range of the free-space wavelength. 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.Thus, structural periodicity does not always lead to electromagnetic periodicity that underlies the exhibition of the Bragg phenomenon.