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.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)