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Published on: July 18, 2015
Wideband circular polarization reflector fabricated by glancing angle deposition
Yong Jun Park1, K M A Sobahan, Chang Kwon Hwangbo
1Department of Physics, Inha University, Incheon 402-751, Republic of Korea.
Abstract:
We demonstrate a wideband circular polarization reflector fabricated as cascades of helical films with different pitch thickness by using glancing angle deposition (GLAD) technique. The full-width-at-half-maximum bandwidth of this reflector is measured from the reflectance spectra and is found about 200 nm indicating the feasibility of wideband reflector. A helical TiO(2) film with three sections, each of different pitch thickness, is also studied. It shows three Bragg peaks at different wavelengths. To select appropriate material for this circular reflector, the optical properties of 5-turns TiO(2), ZrO(2), and Ta2O(5) helical films and the porosity effect on the TiO(2) helical film are investigated.
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