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17 February 2003 B-M-type anisotropy in bacteriorhodopsin films for nonlinear spatial light modulation
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Proceedings Volume 4833, Applications of Photonic Technology 5; (2003)
Event: Applications of Photonic Technology 5, 2002, Quebec City, Canada
Bacteriorhodopsin (BR), a photoreceptor protein possesses a photochemical cycle of several distinct intermediates; all of them are photoactive. The BR molecules both in the initial form of the photocycle, BR570 (absorption maximum around 570 nm) and longest-lived (in films) intermediate M412 (absorption maximum at 412 nm) possess anisotropic absorption. Under the action of linearly polarized light, the reversible anisotropic photoselection of BR molecules takes place. So far only the method of photoinduced anisotropy based on anisotropic properties of BR570 was applied to realtime optical processing. In the present work, the potentialities for the use of photoinduced anisotropy in the BR-films based on both BR570 and M412 for the spatial light modulation are demonstrated. The overall blocking of highintensity features from an image is shown. Mixed B-M-type anisotropy in the chemically modified BR films, as applied to the edge enhancement, can provide a contrast ratio as high as 250:1. Low saturation intensity of the BR-films allows for the blocking of any intensity feature from an image that is carried out by choosing an appropriate intensity level of a controlling He-Ne laser beam without analyzer rotation. The photoanisotropic incoherent-to-coherent optical conversion with concurrent spatial-intensity modulation is also performed on the BR-films.
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Elena Y. Korchemskaya, Dmitriy A. Stepanchikov, Tatyana V. Dyukova, and Valery Yu. Shakhbazian "B-M-type anisotropy in bacteriorhodopsin films for nonlinear spatial light modulation", Proc. SPIE 4833, Applications of Photonic Technology 5, (17 February 2003);

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