All-optical switching in bacteriorhodopsin based on M state dynamics and its application to photonic logic gates
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| Title: | All-optical switching in bacteriorhodopsin based on M state dynamics and its application to photonic logic gates |
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| Authors: | Singh, Chandra Pal1, Roy, Sukhdev sukhdevr@hotmail.com |
| Source: | Optics Communications. Mar2003, Vol. 218 Issue 1-3, p55. 12p. |
| Subjects: | Nonlinear optics, Bacteriorhodopsin |
| Abstract: | All-optical switching has been theoretically analyzed in bacteriorhodopsin (bR) based on nonlinear intensity induced excited state absorption of the M state. The transmission of a cw probe laser beam at 410 nm corresponding to the peak absorption of M state through a bR film is switched by a pulsed pump laser beam at 570 nm that corresponds to the maximum initial B state absorption. The switching characteristics have been numerically simulated using the rate equation approach considering all the six intermediate states (B, K, L, M, N and O) in the bR photocycle. The switching characteristics are shown to be sensitive to various parameters such as the pump pulse width, pump intensity, life time of the M state, thickness of the film and absorption cross-section of the B-state at probe wavelength ( |
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| Database: | Engineering Source |
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