Mr. Kapil Kulshrestha Profile

Kapil Kulshrestha

at Dayalbagh Educational Institute

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Proceedings Article | 6 September 2007 Paper

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

S. Roy, K. Kulshrestha

Proceedings Volume 6646, 66460D (2007) https://doi.org/10.1117/12.734022

KEYWORDS: Absorption, Laser beam diagnostics, Modulation, Logic devices, Switching, Proteins, Continuous wave operation, Spatial light modulators, Optical design, Molecules

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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.

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