Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Bulletin of the American Physical Society

Slow light with bacteriorhodopsin solutions

Chandra S. Yelleswarapu, Francisco J. Aranda, Reji Philip A, Rao Devulapalli

Published Mar 7, 2007• 0 citations
OpenAlex

Related papers

Simultaneous slow and fast light in C60 solution

Chunguang Zhang, Hao Wang

Optik•May 25, 2013•0 citations

Slow light in bacteriorhodopsin solution using coherent population oscillations

Chandra S. Yelleswarapu, Reji Philip A, Francisco J. Aranda +2 more

Slow light is demonstrated in liquid phase in an aqueous bacteriorhodopsin (bR) solution at room temperature. Group velocity as low as 3 m/s (all the way to c) is achieved by exploiting the photoisomerization property of bR for coherent population oscillations. Slow light in the liquid phase offers several advantages over solids or vapors for a variety of applications: (i) shorter lifetimes of the M state facilitate slow light at higher modulation frequencies, (ii) convection makes it possible to obtain large signal delays even at high input powers, and (iii) solution concentration is another convenient parameter to vary the signal delay over a wide range.

Optics Letters•Jun 18, 2007•14 citations

Slowing Light with Biology

Kim Krieger

Focus•Jan 1, 2006•2 citations

New mechanisms of slow light and their applications

Yong Zhao, Huawei Zhao, Xinyuan Zhang +2 more

Optics & Laser Technology•Jan 2, 2009•52 citations

Slow Light Using Biological Bacteriorhodopsin Film

Pengfei Wu

Group velocity of light is reduced to 0.091pm/s in a biological film. Exploiting flexible photo-dynamics for coherent photoisomerization oscillation, the velocity is all-optically controlled. Ultraslow light is observed at microwatt level, indicating high energy efficiency.

Frontiers in Optics•Jan 1, 2006•0 citations

Coherent population oscillations and superluminal light in a protein complex

Chandra S. Yelleswarapu, Samir Laoui, Reji Philip A +1 more

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.

Optics Express•Mar 7, 2008•10 citations
Slow light is demonstrated in liquid phase in an aqueous bacteriorhodopsin (bR) solution at room temperature. Group velocity as low as 3 m/s (all the way to c) is achieved by exploiting the photoisomerization property of bR for coherent population oscillations. Slow light in the liquid phase offers several advantages over solids or vapors for a variety of applications: (i) shorter lifetimes of the M state facilitate slow light at higher modulation frequencies, (ii) convection makes it possible to obtain large signal delays even at high input powers, and (iii) solution concentration is another convenient parameter to vary the signal delay over a wide range.
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.