Abstract
A detailed theoretical analysis of reverse saturable absorption (RSA) to saturable absorption (SA) transition has been presented in Ru complex [{Ru (bipy)2}2L][PF6], with picosecond laser pulses at 532 nm wavelength. Interestingly, it is shown that an increase in pulse intensity leads to transition from RSA to SA, with increased contrast, due to strong excited-state absorption. Theoretical results are in good agreement with reported experimental results. The effect of pulse intensity, pulse width, frequency and concentration has been studied to optimize the RSA to SA transition, which has been used to design all-optical picosecond NOT, AND, OR, and the universal NAND and NOR logic gates. The designs are the first application of Ru dioxolene complex based all-optical logic gates with picosecond switch off/on time. These results show the potential of transition-metal complexes for photonic applications.
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Acknowledgements
The authors are grateful to the University Grants Commission (UGC), Government of India, for partial support of this work. SR is grateful to ICTP, Trieste, Italy for the award of the Research Associateship. CY thanks UGC for the award of a research fellowship.
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Yadav, C., Roy, S. Optimization of ultrafast reverse saturable to saturable absorption transition in Ru dioxolene complex for all-optical logic applications. Opt Quant Electron 49, 25 (2017). https://doi.org/10.1007/s11082-016-0877-3
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DOI: https://doi.org/10.1007/s11082-016-0877-3