Ultrafast wide range all-optical switch using complex refractive-index changes in a composite film of silver and polymer containing photochromic dye

Autor:	Kyoichi Sasaki, Toshihiko Nagamura
Rok vydání:	1998
Předmět:	Spiropyran chemistry.chemical_classification Materials science business.industry General Physics and Astronomy Polymer Optical switch chemistry.chemical_compound Photochromism Optics chemistry Optoelectronics Thin film business Ultrashort pulse Refractive index Beam (structure)
Zdroj:	Journal of Applied Physics. 83:2894-2900
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.367076
Popis:	An all-optical ultrafast switch which operates at a wide wavelength range has been demonstrated based on photoinduced changes of real and/or imaginary parts of complex refractive index in a composite thin film of silver and polymer containing photochromic spiropyran dye. Very fast switching ON and OFF of a reading beam within 20 ns in a 400–800 nm range was achieved at the incident angle of guided-wave mode using a photochromic spiropyran-doped polystyrene thin film and a ns pulsed UV or visible laser as a writing beam. These responses were caused by the changes of complex refractive index due to photochromism. No applied power was required to hold the switched state. An image was also written to the probe beam by irradiation through a pattern.
Databáze:	OpenAIRE
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