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Polarization Holographic Gratings with Enhanced Parameters Recorded in Azopolymer based Nanocomposite Materials
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- Authors
- Dimana Nazarova, Georgi Mateev, Lian Nedelchev, Elena Stoykova, Blaga Blagoeva, Nataliya Berberova, Keehoon Hong, Joongki Park
- Issue Date
- 2021-01
- Citation
- Optik - International Journal for Light and Electron Optics, v.226, no.2, pp.1-11
- ISSN
- 0030-4026
- Publisher
- Urban & Fischer
- Language
- English
- Type
- Journal Article
- Abstract
- We present study of the parameters 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]) and in a composite PAZO-based organic/inorganic material with incorporated TiO2 nanoparticles with size 21 nm and different concentrations. The gratings are inscribed by two plane waves with left and right circular polarization from a He-Cd gas laser (442 nm) at recording angle 20째. Along with the anisotropic grating in the volume of the media, surface relief is also formed. Gratings with different spatial frequencies are obtained by varying the recording angle. The diffraction efficiency kinetics is probed at 635 nm and the height of the relief gratings is determined by AFM. Our results indicate that the diffraction efficiency for the hybrid samples is enhanced with respect to the pure azopolymer films. Comparison is also made between polarization response of samples deposited from water and from methanol solution.
- KSP Keywords
- 5 nm, Anisotropic grating, Holographic gratings, Inorganic material, Methanol solution, Nanocomposite materials, Plane waves, Relief gratings, Surface relief, TiO2 nanoparticles, circular polarizations(CPs)