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Journal Article Polarization Diffraction Gratings in PAZO Polymer Thin Films Recorded with Digital Polarization Holography: Polarization Properties and Surface Relief Formation
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Authors
Nataliya Berberova-Buhova, Lian Nedelchev, Georgi Mateev, Ludmila Nikolova, Elena Stoykova, Branimir Ivanov, Velichka Strijkova, Keehoon Hong, Dimana Nazarova
Issue Date
2024-05
Citation
PHOTONICS, v.11, no.5, pp.1-12
ISSN
2304-6732
Publisher
MDPI
Language
English
Type
Journal Article
DOI
https://dx.doi.org/10.3390/photonics11050425
Project Code
24HC2900, Development of Holo-TV Core Technologies for Hologram Media Services, Keehoon Hong
Abstract
In this work, we study the polarization properties of diffraction gratings recorded in thin films of the azopolymer PAZO (poly[1-[4-(3-carboxy-4-hydroxyphenylazo)benzene sulfonamido]-1,2-ethanediyl, sodium salt]) using digital polarization holography. Using two quarter-wave plates, the phase retardation of each pixel of the SLM is converted into the azimuth rotation of linearly polarized light. When recording from the azopolymer side of the sample, significant surface relief amplitude is observed with atomic force microscopy. In contrast, recording from the substrate side of the sample allows the reduction of the surface relief modulation and the obtaining of polarization gratings with characteristics close to an ideal grating, recorded with two orthogonal circular polarizations. This can be achieved even with a four-pixel period of grating, as demonstrated by our results.
KSP Keywords
Atomic force microscope(AFM), Linearly polarized light, Polarization holography, Polarization properties, Polymer thin films, Quarter-wave, Surface relief, Wave plates, circular polarizations(CPs), force microscopy, phase retardation
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