Results 111 to 120 of about 233 (148)

On surface relief gratings in azopolymers

Molecular Machines, 2018
Over the past two decades, surface relief gratings have attracted much interest owing to their potential applications in optical data storage and optical communication and holography. Azobenzene-containing polymer films show an interesting behavior under irradiation with light interference patterns. The inhomogeneous irradiation; e.g.
M. Halim, Dmitry Nesterenko, Tarik Mahfoud, Anouar Rahmouni, Zouheir Sekkat, Sara Moujdi   +5 more
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Azopolymer‐based micro‐ and nanopatterning for photonic applications

Journal of Polymer Science Part B: Polymer Physics, 2013
ABSTRACTAzopolymers comprise a unique materials platform, in which the photoisomerization reaction of azobenzene molecules can induce substantial material motions at molecular, mesoscopic, and even macroscopic length scales. In particular, amorphous azopolymer films can form stable surface relief patterns upon exposure to interfering light. This allows
Priimagi, Arri, Shevchenko, Andriy
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Tapered fiber devices with azopolymer coating

Advanced Photonics, 2011
Azopolymer coated fiber devices are demonstrated for in-fiber polarization control using an external laser beam. When placed in a fiber cavity, photo-induced birefringence on these devices modifies the spectral and polarization of fiber ...
A. M. Velázquez-Benítez, J. Hernández-Cordero   +1 more
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Cooperative interaction in azopolymers upon irradiation

New Journal of Chemistry, 2009
We present two optical experiments which permits to evaluate individual and collective behaviours of molecules leading to a well-organized pattern in a randomly activated molecular assembly; in a first experiment a white light and a laser beam are sent together; in a second experiment a low-power coherent beam carrying polarization and wavelength ...
Régis Barille, Sohrab Ahmadi-Kandjani, Ewelina Ortyl, Stanislaw Kucharski, Jean-Michel Nunzi   +4 more
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Photochemical and Photophysical Behavior of Azopolymer Compounds

2016
Two phenyl rings separated by an azo (–N=N–) bond known as Azobenzene, functions as the base molecule for a wide class of aromatic azo compounds. Azobenzenes almost cover the full rainbow, and up to and almost 70 % of the world’s commercial dyes are still azobenzene-based.
Elnaz Bagherzadeh-Khajehmarjan, Sohrab Ahmadi-Kandjani, Shahla Golghasemi-Sorkhabi   +2 more
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Polarization multiplexing of holograms in azopolymer films

SPIE Proceedings, 2005
Polarization multiplexing of holograms in azobenzene polymers has been investigated. The optimal conditions for multiplexing two holograms with teh same spatial frequency in the same volume of the polymer and the same linear polarization of the reference wave have been found.
Lian Nedelchev, Detelina Ilieva, Tzveta Petrova, Natalia Tomova, Violeta Dragostinova, Ludmila Nikolova   +5 more
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Photochromic properties of polyimide and polysiloxane azopolymers

Polymer International, 2008
AbstractBACKROUND: One of the most important properties of the azobenzene chromophores is the photochemical trans–cis isomerization induced by UV or visible light. In azopolymers, the photoisomerization induces conformational changes in the polymer chains, which in turn lead to macroscopic variations in the chemical and physical properties of the ...
Ion Sava, Liviu Sacarescu, Iuliana Stoica, Ileana Apostol, Victor Damian, Nicolae Hurduc   +5 more
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Piperazine Azopolymer Thin Films

2012
This chapter describes the linear and nonlinear optical (NLO) properties of thin films prepared from various liquid crystalline (LC) azo polymers with different donor groups and different azo chromophore content.
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High Tg azopolymers for Photorefractive applications

2009
In recent years, the development of organic materials for optoelectronics and photonics has been continuously progressing, driven by the prospect of manufacturing flexible, low cost devices with tailorable properties for specific applications. Photorefractive (PR) materials are photoconductors in which the space redistribution of charges photogenerated
ANGIOLINI, LUIGI, GIORGINI, LORIS, A. Golemme, Q. Lhi, F. Mauriello, R. Termine   +5 more
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Mechanisms of optical anisotropy induction in azopolymer films

Journal of Applied Spectroscopy, 1998
The process of optical anisotropy indiction in azopolymer films upon irradiation by polarized UV light is studied by means of UV and IR birefringence spectroscopy. A substantial dependence of the character of the relaxation of the induced anisotropy on the exposure time to the exciting light is revealed: whereas the process of anisotropy induction is ...
G. A. Puchkovskaya, A. G. Tereshchenko, L. I. Shanskii, O. V. Yaroshchuk   +3 more
openaire   +1 more source