Anisotropy of 3D Columnar Coatings in Mid-Infrared Spectral Range

0554109 - FZÚ 2022 RIV CH eng J - Článek v odborném periodiku
Grineviciute, L. - Ng, S. - Han, M. - Moein, T. - Anand, V. - Katkus, T. - Ryu, M. - Morikawa, J. - Tobin, M. - Vongsvivut, J. - Tolenis, Tomas - Juodkazis, S.
Anisotropy of 3D Columnar Coatings in Mid-Infrared Spectral Range.
Nanomaterials. Roč. 11, č. 12 (2021), č. článku 3247. E-ISSN 2079-4991
Výzkumná infrastruktura: ELI Beamlines III - 90141
Institucionální podpora: RVO:68378271
Klíčová slova: polarisation * IR * fingerprint region * birefringence * dichroism * sculptured thin films * anisotropy
Obor OECD: Optics (including laser optics and quantum optics)
Impakt faktor: 5.719, rok: 2021
Způsob publikování: Open access

Polarisation analysis in the mid-infrared fingerprint region was carried out on thin (∼1 μm) Si and SiO2 films evaporated via glancing angle deposition (GLAD) method at 70∘ to the normal. Synchrotron-based infrared microspectroscopic measurements were carried out on the Infrared Microspectroscopy (IRM) beamline at Australian Synchrotron. Specific absorption bands, particularly Si-O-Si stretching vibration, was found to follow the angular dependence of ∼cos2θ, consistent with the absorption anisotropy. This unexpected anisotropy stems from the enhanced absorption in nano-crevices, which have orientation following the cos2θ angular dependence as revealed by Fourier transforming the image of the surface of 3D columnar films and numerical modeling of light field enhancement by sub-wavelength nano-crevices.
Trvalý link: http://hdl.handle.net/11104/0328748