All-optical logic gates with bacteriorhodopsin |
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Affiliation: | 2. Centre for Biofuels, Microbial Processes and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram, India;2. IMDEA Energy, Biotechnological Processes Unit, Móstoles, Spain |
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Abstract: | All-optical logic gates with bacteriorhodopsin (bR) protein molecules have been demonstrated based on all-optical switching of a cw probe laser beam by multiple pulsed pump laser beams due to nonlinear intensity-induced excited-state absorption. A cw probe laser beam at 640 nm corresponding to the peak absorption of O-state in the bR photocycle is switched by a pulsed pump laser beam at 570 nm corresponding to the maximum initial B state absorption, at relatively low powers. The switching characteristics have been used to design all-optical NOT and the universal NOR and NAND logic gates and the effect of various parameters such as variation in pump pulse width, pump intensity, lifetime of O state and absorption cross-section of the B state at probe wavelength on the switching characteristics has been analyzed. |
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