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Proceedings Paper

All-optical switching and all-optical logic gates based on bacteriorhodopsin
Author(s): Yuhua Huang; Shin-Tson Wu; Youyuan Zhao
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Paper Abstract

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.

Paper Details

Date Published: 1 June 2004
PDF: 14 pages
Proc. SPIE 5331, Nanobiophotonics and Biomedical Applications, (1 June 2004); doi: 10.1117/12.529178
Show Author Affiliations
Yuhua Huang, CREOL/Univ. of Central Florida (United States)
East China Normal Univ. (China)
Shin-Tson Wu, CREOL/Univ. of Central Florida (United States)
Youyuan Zhao, Fudan Univ. (China)

Published in SPIE Proceedings Vol. 5331:
Nanobiophotonics and Biomedical Applications
Alexander N. Cartwright, Editor(s)

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