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1 April 2020 Diffraction efficiency of polarization holographic gratings recorded in azopolymer thin films coated using different solvents
Blaga Blagoeva, Lian Nedelchev, Georgi Mateev, Elena Stoykova, Dimana Nazarova
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Proceedings Volume 11367, Photosensitive Materials and their Applications; 113671G (2020) https://doi.org/10.1117/12.2555756
Event: SPIE Photonics Europe, 2020, Online Only
Abstract
We present a study of the diffraction efficiencies of polarization holographic gratings recorded in thin films of the azopolymer PAZO (poly[1-[4-(3-carboxy-4-hydroxyphenylazo) benzenesulfonamido]-1,2-ethanediyl, sodium salt]). Two series of layers have been prepared using two different solvents – distilled water and methanol. The gratings are inscribed by two plain waves with orthogonal circular polarizations (left and right circular) from a He-Cd gas laser (442 nm) at recording angle 20°, corresponding to grating period 1.3 μm. Higher diffraction efficiency is obtained for the thin film samples spin-coated from the methanol solution for thicknesses below 600 nm. Diffraction efficiency higher than 27% was achieved, as well as surface relief height more than 500 nm.
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Blaga Blagoeva, Lian Nedelchev, Georgi Mateev, Elena Stoykova, and Dimana Nazarova "Diffraction efficiency of polarization holographic gratings recorded in azopolymer thin films coated using different solvents", Proc. SPIE 11367, Photosensitive Materials and their Applications, 113671G (1 April 2020); https://doi.org/10.1117/12.2555756
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KEYWORDS
Polarization
Diffraction
Diffraction gratings
Thin films
Holography
Birefringence
Surface properties
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