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Applied Optics

Applied Optics


  • Vol. 44, Iss. 26 — Sep. 10, 2005
  • pp: 5497–5503

High-contrast, all-optical switching in bacteriorhodopsin films

Ravinder Kumar Banyal and B. Raghavendra Prasad  »View Author Affiliations

Applied Optics, Vol. 44, Issue 26, pp. 5497-5503 (2005)

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We report experiments with nonlinear-absorption-based, high-contrast, all-optical switching in photochromic bacteriorhodopsin (BR) films. The switching action is accomplished by control of the transmission of a weak probe beam through a BR sample with the help of strong pump beam illumination at 532 nm wavelength. We found that the switching properties of BR films depend on several experimentally controllable parameters such as probe wavelength, pump beam intensity, and excitation rate. A comparative study of the switching behavior and other parameters of practical use was carried out at three probe wavelengths (543, 594, and 633 nm) and various beam powers and pump excitation rates. The results are presented for commercially available wild-type and D96N variant BR films.

© 2005 Optical Society of America

OCIS Codes
(060.1810) Fiber optics and optical communications : Buffers, couplers, routers, switches, and multiplexers
(190.4400) Nonlinear optics : Nonlinear optics, materials
(230.1150) Optical devices : All-optical devices
(310.6860) Thin films : Thin films, optical properties

Original Manuscript: February 4, 2005
Revised Manuscript: April 21, 2005
Manuscript Accepted: April 23, 2005
Published: September 10, 2005

Ravinder Kumar Banyal and B. Raghavendra Prasad, "High-contrast, all-optical switching in bacteriorhodopsin films," Appl. Opt. 44, 5497-5503 (2005)

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