All-optical switching with bacteriorhodopsin

Details All-optical switching with bacteriorhodopsin All-optical switching with bacteriorhodopsin

2003-10-09

arxiv.org/abs/physics/0310040v1

Physics

Optics

Submitted for publication

Scientific paper

10.1016/j.optcom.2004.04.013

All-optical, mirrorless switching and bistability is demonstrated with bacteriorhodopsin (bR). A low-power, 532 nm laser beam modulates the transmission of a cw laser beam at 635 nm that corresponds to peak absorption of the O-excited state in the bR photocycle. The switch has features like a NOT-gate; its switching contrast depends on the pulse width and average power of the modulating laser. The phase of the switching characteristics can be controlled by varying the pulse width and frequency of the modulating laser. Simulations based on a rate equation approach considering a six-state model of the bR photocycle successfully reproduce the experimental results.

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