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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editor: Gregory W. Faris
  • Vol. 3, Iss. 4 — Apr. 23, 2008

Coherent population oscillations and superluminal light in a protein complex

Chandra S. Yelleswarapu, Samir Laoui, Reji Philip, and D. V. G. L. N. Rao  »View Author Affiliations


Optics Express, Vol. 16, Issue 6, pp. 3844-3852 (2008)
http://dx.doi.org/10.1364/OE.16.003844


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Abstract

We observed superluminal light in aqueous solution of the protein complex bacteriorhodopsin (bR) at 647.1 nm wavelength where it exhibits reverse saturable behavior, exploiting the technique of coherent population oscillations (CPO). With a modulation frequency of 10 Hz, the signal pulse through a 1 cm path cell is ahead by 3 msec relative to the reference pulse, corresponding to a group velocity of -3.3 m/sec. Following our early work on slow light in the same sample at the saturable wavelength 568.2 nm, we now explicitly observed the narrow spectral hole in the absorption band of the stable B state and further, demonstrated a close correlation between the profile of the hole and the corresponding pulse delay for various modulation frequencies. A similar behavior is observed for superluminal light versus antihole blown in the absorption band.

© 2008 Optical Society of America

OCIS Codes
(020.1670) Atomic and molecular physics : Coherent optical effects
(190.4710) Nonlinear optics : Optical nonlinearities in organic materials
(190.5530) Nonlinear optics : Pulse propagation and temporal solitons
(160.1435) Materials : Biomaterials

ToC Category:
Slow and Fast Light

History
Original Manuscript: December 19, 2007
Revised Manuscript: February 29, 2008
Manuscript Accepted: March 1, 2008
Published: March 7, 2008

Virtual Issues
Vol. 3, Iss. 4 Virtual Journal for Biomedical Optics

Citation
Chandra S. Yelleswarapu, Samir Laoui, Reji Philip, and D. V. Rao, "Coherent population oscillations and superluminal light in a protein complex," Opt. Express 16, 3844-3852 (2008)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=oe-16-6-3844


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