Abstract
We present a detailed analysis of all-optical ultrafast switching with the unique photochromic bacteriorhodopsin (bR) protein, based on its early transitions (B570 →I460), in the pump-probe configuration. The transmission of a cw probe laser beam at 460 nm through bR is switched by a pulsed pump beam at 570 nm with high contrast and sub-ps switching. The effect of pump intensity, pump pulse width, absorption cross-section and lifetime of the I460 state on the switching characteristics has been studied in detail. Theoretical simulations are in good agreement with reported experimental results. The results have been used to design ultrafast all-optical NOT and the universal NOR and NAND logic gates with multiple pump laser pulses. The analysis demonstrates the applicability of bR for all-optical ultrafast operations in the simple pump-probe geometry and opens up exciting prospects for its use in optical supercomputing.
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Roy, S., Yadav, C. (2013). All-Optical Ultrafast Switching and Logic with Bacteriorhodopsin Protein. In: Dolev, S., Oltean, M. (eds) Optical Supercomputing. OSC 2012. Lecture Notes in Computer Science, vol 7715. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-38250-5_8
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DOI: https://doi.org/10.1007/978-3-642-38250-5_8
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