Periodically patterned columnar thin films as blazed diffraction gratings

Jhuma Dutta, S. Anantha Ramakrishna, Akhlesh Lakhtakia

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

Periodically patterned columnar thin films (PP-CTFs) were made by evaporating CaF2 and directing the vapor flux obliquely towards lithographically fabricated micrometer/sub-micrometer gratings. The growth of the PP-CTFs was controlled by the deposition rate to form prismatic air cavities within them. These PP-CTFs function like blazed diffraction gratings with asymmetric diffraction patterns and diffraction efficiencies up to 80 in transmission at ultraviolet-visible wavelengths. Diffraction theory adequately establishes that the blazing action arises due to the prismatic cavities and explains the measured diffraction efficiencies.

Original languageEnglish (US)
Article number161116
JournalApplied Physics Letters
Volume102
Issue number16
DOIs
StatePublished - Apr 22 2013

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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