We report a convenient method to obtain all‐optical light modulation in bacteriorhodopsin films using a degenerate four‐wave mixing geometry. Chemically stabilized films of bacteriorhodopsin in a polymer matrix for which the lifetime of the excited M state is tens of seconds were used to demonstrate all‐optical light intensity modulation. The films are observed to be stable over a period of 4 years. Due to the sensitivity of the films, small intensities of order microwatt/ cm2 are required in the modulation experiments. Furthermore the fast photochemical transition from M to B permit reasonably fast modulation speeds independent of the slow thermal M and B relaxation time. The experimental system also acts as an all‐optical switch where a low power blue pulse turns on a signal red beam.
Aranda, F. J.; Garimella, R.; McCarthy, N. F.; Rao, D. Narayana; Rao, D.V.G.L.N.; Chen, Z.; Akkar, J. A.; and Kaplan, D. L., "All‐optical light modulation in bacteriorhodopsin films" (1995). Physics Faculty Publications. 31.
American Institute of Physics
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