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Biochemistry and Biophysics Seminar

"Quantum Biophotonics"

Dr. Girish S. Agarwal
Oklahoma State University


In this talk I will discuss a range of quantum coherence phenomena and their applications. Coherent nonlinear effects such as second harmonic generation, stimulated Raman and coherent anti-Stokes Raman scattering (CARS) have now become standard tools for scientific studies, especially in biological systems. These effects get enhanced by several orders of magnitude by using nanoparticle environment, thus making surface-enhanced nonlinear studies very attractive. CARS is especially important as it can combine the enhancements resulting from an induced Raman coherence and the plasmonic environment. The surface-enhanced CARS has an unusually large sensitivity, as shown in recent TAMU experiments.

The importance of quantum coherence is gaining recognition in fields beyond physics, for example in photosynthesis. The coherence can be created by coherent fields, as for example in CARS. However, many systems intrinsically possess quantum coherence which arises from the interference of quantum transition amplitudes and occurs even for systems in thermal environment; this is especially relevant for heat engines and systems interacting with the most natural source, i.e., sunlight. For example, this coherence can enhance the efficiency of a variety of heat engines - from photocells to biological heat engines.

Tuesday, August 11, 2015
Room 107 BICH, 12:00 Noon
Biochemistry and Biophysics Building

Biochemistry and Biophysics
Texas A&M University

(Sandwiches, salad, and soda to be served at 11:30 a.m.)