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Titolo:
Phase-type gratings formed by photochemical phase transition of polymer azobenzene liquid crystal. 2. Rapid switching of diffraction beams in thin films
Autore:
Yamamoto, T; Ohashi, A; Yoneyama, S; Hasegawa, M; Tsutsumi, O; Kanazawa, A; Shiono, T; Ikeda, T;
Indirizzi:
Tokyo Inst Technol, Chem Resources Lab, Midori Ku, Yokohama, Kanagawa 2268503, Japan Tokyo Inst Technol Yokohama Kanagawa Japan 2268503 anagawa 2268503, Japan
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 12, volume: 105, anno: 2001,
pagine: 2308 - 2313
SICI:
1520-6106(20010329)105:12<2308:PGFBPP>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
REFLECTION-MODE ANALYSIS; HOLOGRAPHIC IMAGE STORAGE; SIDE-CHAIN POLYMERS; AZO-DYE; OPTICAL STORAGE; ENHANCEMENT; EFFICIENCY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Ikeda, T Tokyo Inst Technol, Chem Resources Lab, Midori Ku, 4259 Nagatsuta, Yokohama, Kanagawa 2268503, Japan Tokyo Inst Technol 4259 Nagatsuta Yokohama Kanagawa Japan 2268503
Citazione:
T. Yamamoto et al., "Phase-type gratings formed by photochemical phase transition of polymer azobenzene liquid crystal. 2. Rapid switching of diffraction beams in thin films", J PHYS CH B, 105(12), 2001, pp. 2308-2313

Abstract

Dynamic holographic gratings were investigated with thin films of polymer azobenzene liquid crystals by periodic induction of photochemical nematic-to-isotropic phase transition. On irradiation of writing beams (488 nm), multiple diffraction beams of a reading beam (633 nm) were immediately observed. The first-order diffraction efficiency reached to a maximum value withinseveral tens of milliseconds: the rise time was approximately 50 ms for PM6AB2 films and 30 ms for PA6ABCN films. Quite large modulation in refractive index (similar to0.08) was obtained in both polymer films. Studies on effects of temperature and light intensity on the grating formation suggested that photochemical reactions of azobenzene moieties followed by photochemical phase transition in bright fringes of the interference pattern would be responsible for the formation of holographic gratings. By turning on and off the writing beams, the diffraction beams could be switched dynamically without significant fatigue.

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Documento generato il 26/11/20 alle ore 11:16:38