1 June 2004 All-optical switching and all-optical logic gates based on bacteriorhodopsin
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We demonstrate an all-optical switching using a bacteriorhodopsin (bR) film. The transmission of the bR film is investigated using the pump-probe method. A diode-pumped second harmonic YAG laser (λ = 532nm which is around the maximum initial B state absorption) was used as a pumping beam and a cw He-Ne laser (λ = 632 nm which is around the peaks of K and O states) was used as a probe. Due to the nonlinear intensity induced excited state absorption of the K, L, M, N, and O states in the bR photocycle, the switching characteristics are sensitive to the intensity of the probe and pump beams. Based on this property, we design an all-optical operating device functioning as 11 kinds of variable binary all-optical logic gates. The incident 532nm beam acts as an input to the logic gate and the transmission of the 632nm bears the output of the gate.
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Yuhua Huang, Yuhua Huang, Shin-Tson Wu, Shin-Tson Wu, Youyuan Zhao, Youyuan Zhao, } "All-optical switching and all-optical logic gates based on bacteriorhodopsin", Proc. SPIE 5331, Nanobiophotonics and Biomedical Applications, (1 June 2004); doi: 10.1117/12.529178; https://doi.org/10.1117/12.529178

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