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9 October 1998 All-optical parallel switching by the use of guided-wave geometry composed of a thin silver film and a polymer thin film containing organic dye
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Abstract
A novel all-optical parallel switching device was proposed based on photoinduced changes of a complex refractive index in a guided mode thin film composed of silver and polymer containing organic dyes. An incident angle of a probe beam was set at a value corresponding to the minimum reflection due to a guided wave mode. Pulsed laser excitation caused changes of absorption of the polymer films due to excited state formation or photochromism, which resulted in the increase of reflection because the guided mode condition was changed. According to the Kramers-Kronig relationship the real part also changes, which results in the shift of the minimum. We can select the wavelength for all-optical switching in this geometry. We used phthalocyanines and photochromic spiropyran dispersed in poly(vinyl alcohol) or polystyrene. For the former system, transient absorption due to the excited triplet gave a highly reversible very fast modulation of green light upon repeated excitation by ns laser. For the latter, self-held switching was achieved upon UV or visible laser excitation with response times less than 20 ns. The details of these systems will be presented.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Toshihiko Nagamura and Kyoichi Sasaki "All-optical parallel switching by the use of guided-wave geometry composed of a thin silver film and a polymer thin film containing organic dye", Proc. SPIE 3466, Algorithms, Devices, and Systems for Optical Information Processing II, (9 October 1998); https://doi.org/10.1117/12.326783
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