Results 1 to 10 of about 47 (30)

Hybrid Dispersion Model Characterization of PAZO Azopolymer Thin Films over the Entire Transmittance Spectrum Measured in the UV/VIS/NIR Spectral Region [PDF]

Materials, 2022
Notwithstanding the significant optical applicability of PAZO polymer films, there are no accurate data about their optical characteristics. To remedy this shortcoming, in this study three PAZO polymer thin films are characterized, with dissimilar thicknesses, on glass substrates using only one UV/VIS/NIR transmittance spectrum T(λ) per sample and an ...
Lian Nedelchev, George Angelov, Blaga Blagoeva   +2 more
exaly   +6 more sources

Structure-dependent thermochromism of PAZO thin films: theory and experiment [PDF]

Beilstein Journal of Nanotechnology
Poly[1-[4-(3-carboxy-4-hydroxyphenylazo)benzenesulfonamido]-1,2-ethanediyl, sodium salt] (PAZO) exhibits a range of unique physical properties that are critical for its diverse applications in photonics, optoelectronics, memory devices, and sensing ...
Georgi Mateev, Elena Stoykova
exaly   +3 more sources

High photoinduced birefringence in thermally treated layers of the azopolymer PAZO with significantly changed absorbance spectrum [PDF]

EPJ Web of Conferences
In this experimental work we present the effect of thermal treatment of azopolymer thin films on their absorbance spectra and how that influences the photoinduced birefringence of the azopolymer.
Deyan Dimov, Lian Nedelchev, Keehoon Hong   +2 more
exaly   +3 more sources

Tunable Polarization and Surface Relief Holographic Gratings in Azopolymer Nanocomposites with Incorporated Goethite (α-FeOOH) Nanorods

Photonics, 2021
We employ two approaches to tune the properties of concurrently inscribed volume polarization and surface relief gratings in nanocomposite thin films containing the azopolymer PAZO (poly[1-4-(3-carboxy-4-hydrophenylazo)benzensulfonamido]-1,2-ethanediyl ...
Lian Nedelchev, David Schmool, Veronica Salgueiriño   +2 more
exaly   +3 more sources

Improvement of the photoinduced birefringence in azopolymer PAZO doped with TiO2 nanoparticles via thermal treatment [PDF]

Open Material Sciences, 2019
Abstract We present a study of the photoinduced birefringence in nanocomposite films of the azopolymer PAZO (poly[1-[4-(3-carboxy-4-hydroxyphenylazo)benzenesulfon amido]-1,2-ethanediyl, sodium salt]) doped with TiO2 nanoparticles (NP) with different concentrations before and after thermal annealing.
Lian Nedelchev, Anton Georgiev, Dimana Nazarova   +2 more
exaly   +2 more sources

Two-Dimensional Polarization Holographic Gratings in Azopolymer Thin Films: Polarization Properties in the Presence or Absence of Surface Relief

Photonics, 2023
During polarization holographic recording in azopolymer thin films, usually together with the volume anisotropic grating, a surface relief grating (SRG) is also formed.
Lian Nedelchev, Dimana Nazarova, Velichka Strijkova   +2 more
exaly   +3 more sources

Improvement of the photoinduced birefringence in PAZO azopolymer doped with ZnO via electrospray deposition

Journal of Physics: Conference Series, 2020
Abstract We present a study of the birefringence photoinduced in thin nanocomposite films of an azopolymer (PAZO) doped with different concentrations of nanoparticles (NPs) of ZnO with spherical shape and size in the range 40 – 100 nm.
Lian Nedelchev, Tsvetanka Babeva, Dimana Nazarova   +2 more
exaly   +3 more sources

Optical constants of azopolymer PAZO thin films in the spectral range 320 – 800 nm

Journal of Physics: Conference Series, 2018
Azobenzene containing polymers (azopolymers) have been investigated for a number of applications - holographic data storage, polarization optical elements, diffractive gratings, etc. Herein we report on the optical characteristics of films obtained from the commercially available water soluble azopolymer PAZO (poly[1-[4-(3-carboxy-4-hydroxyphenylazo ...
Lian Nedelchev, Dimana Nazarova
exaly   +3 more sources

Polarization holographic gratings in PAZO azopolymer recorded with different recording-beams polarizations

Journal of Physics: Conference Series, 2018
Polarization holographic gratings (PHG) were recorded using a laser emitting a wavelength of 491 nm in thin films of the (poly[1-[4-(3-carboxy-4-hydroxyphenylazo)benzenesulfonamido]-1,2-ethanediyl, sodium salt]) azopolymer, shortly denoted as PAZO. Thin azopolymer films with various thicknesses were spin-coated on plastic and glass substrates.
Lian Nedelchev, Deyan Ivanov, Dimana Nazarova   +2 more
exaly   +3 more sources

Polarization Diffraction Gratings in PAZO Polymer Thin Films Recorded with Digital Polarization Holography: Polarization Properties and Surface Relief Formation

Photonics
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 ...
Lian Nedelchev, Keehoon Hong, Dimana Nazarova   +2 more
exaly   +3 more sources