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Analysis of all-optical switching in bacteriorhodopsin

Roy, Sukhdev and Singh, CP and Reddy, KPJ (2002) Analysis of all-optical switching in bacteriorhodopsin. In: Current Science, 83 (5). pp. 623-627.


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All-optical switching has been demonstrated in bacteriorhodopsin (bR) based on nonlinear, intensity-induced excited state absorption. The transmission of a cw probe laser beam at 640 nm corresponding to the peak absorption of O-state through a bR film, is switched by a pulsed pump laser beam at 570 nm that corresponds to the maximum initial B-state absorption. The switching characteristics have been analysed using the rate equation approach and the six intermediate states in the bR photocycle. The effect of various parameters such as pump pulse width and intensity, rate constants of M and O states and absorption cross-section of the B-state at probe wavelength on switching, have been analysed in detail. It has been shown that the probe laser beam can be completely switched off by the pump laser beam at relatively low pump powers, if the B-state does not absorb the probe beam.

Item Type: Journal Article
Publication: Current Science
Publisher: Indian Academy of Sciences
Additional Information: Copyright for this article belongs to Indian Academy of Sciences.
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited: 22 Sep 2004
Last Modified: 19 Sep 2010 04:16
URI: http://eprints.iisc.ac.in/id/eprint/2000

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