Design of an all-optical spatial light modulator and logic gates with phototropin

S. Roy; K. Kulshrestha

doi:10.1117/12.734022

6 September 2007 Design of an all-optical spatial light modulator and logic gates with phototropin

S. Roy, K. Kulshrestha

Proceedings Volume 6646, Nanobiotronics; 66460D (2007) https://doi.org/10.1117/12.734022
Event: NanoScience + Engineering, 2007, San Diego, California, United States

Abstract

All-optical switching has been theoretically analyzed in LOV2 phototropin, the blue light plant photoreceptor based on nonlinear intensity-induced excited-state absorption. The transmission of a cw probe laser beam at 660 nm through LOV2 protein can be controlled by a cw or pulsed pump laser beam at 442 nm, respectively. This modulation is sensitive to the small-signal absorption coefficient, absorption cross-section of the excited L-state at pump beam wavelength and sample thickness. It is shown that the unique spectral and kinetic properties of wild-type LOV2 and LOV2-C39A mutant, result in the probe beam getting completely switched off (100% modulation), by the pump laser beam of intensity 50 kW/cm² and 1 kW/cm², respectively. The switching response in LOV2-WT is faster (~μs) than in LOV2-C39A mutant (~ms). The results have been used to design an optically-addressed spatial light modulator and all-optical NOT, and the universal NAND and NOR logic gates. The results show the applicability of this novel plant photoreceptor protein for photonic applications.

Citation Download Citation

S. Roy and K. Kulshrestha "Design of an all-optical spatial light modulator and logic gates with phototropin", Proc. SPIE 6646, Nanobiotronics, 66460D (6 September 2007); https://doi.org/10.1117/12.734022

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