Optical Physics and Nano-Photonics Seminar

Dr. Sergey Vergeles

Landau Institute for Theoretical Physics Russian Academy of Science

and Moscow Institute of Physics and Technology (National University)

Title:

Nanolaser based on spaser (surface plasmon amplification by stimulated emission of radiation)

Abstract:
The operation of a surface plasmon amplification by stimulated emission of radiation- (spaser)-based nanolaser is theoretically investigated. We develop a description of the laser generation in a system of plasmonic core with gain shell starting from the basic principles, which are Maxwell's equations for electromagnetic field and the two-level-model for the dye molecules. Thus, we present general approach to describe such a system and the results for the spherical geometry of the spaser.

We show that the lasing frequency undergoes a shift as the lasing intensity increases, a result that agrees with recent experiments. The mechanism of the intensity-dependent shift involves a spatial deformation of the lasing mode, which is induced by the spatial hole burning in the surrounding gain media. We develop a general analytical scheme to account for the mode deformation. Our numerical calculations demonstrate good correspondence of the lasing frequency shift with the experimental data for the simplest (spherical) geometry of the spaser.

Bio:

Dr. Sergey Vergeles is a Junior research fellow with Landau Institute for Theoretical Physics,
Russian Academy of Science, Moscow, Russia and Lecturer in Moscow Institute of Physics and Technology, Dolgoprudny, Russia (quantum mechanics, statistical physics). Graduated from Moscow Institute of Physics and Technology in 2005, got Ph.D. in 2008. Ph.D. thesis: "Rheological properties of a vesicular suspension." Current research interests include nanophotonics, plasmonics, fiber optics.
http://home.itp.ac.ru/~ssver/index_eng.html

Hosted by Dr. Drachev Vladimir.drachev@unt.edu 765-426-6054