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Proceedings Paper

Forced spaser oscillations
Author(s): Alexander A. Lisyansky; Eugeney S. Andrianov; Alexander V. Dorofeenko; Alexander A. Pukhov; Alexey P. Vinogradov
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Paper Abstract

We study oscillations of a spaser driven by an external optical wave. When the frequency of the external field is shifted from the frequency of an autonomous spaser, the spaser exhibits stochastic oscillations at low field intensity. The plasmon oscillations lock to the frequency of the external field only when the field amplitude exceeds a threshold value. We find a region of external field amplitude and the frequency detuning (the Arnold tongue) for which the spaser becomes synchronized with the external wave. We obtain the conditions upon the amplitude and frequency of the external field (the curve of compensation) at which the spaser’s dipole moment oscillates with a phase shift of π relatively to the external wave. For these values of the amplitude and frequency, the loss in the metal nanoparticles within the spaser is exactly compensated for by the gain. It is expected that if these conditions are not satisfied, then due to loss or gain of energy, the amplitude of the wave travelling along the system of spasers either tends to the curve of compensation or leave the Arnold tongue. We also consider cooperative phenomena showing that in a chain of interacting spasers, depending on the values of the coupling constants, either all spasers oscillate in phase or a nonlinear autowave travels in the system. In the latter scenario, the traveling wave is harmonic, unlike excitations in other nonlinear systems. Due to the nonlinear nature of the system, any initial distribution of spaser states evolves into one of these steady states.

Paper Details

Date Published: 9 October 2012
PDF: 16 pages
Proc. SPIE 8457, Plasmonics: Metallic Nanostructures and Their Optical Properties X, 84570X (9 October 2012); doi: 10.1117/12.946616
Show Author Affiliations
Alexander A. Lisyansky, Queen's College, CUNY (United States)
Eugeney S. Andrianov, Institute for Theoretical and Applied Electromagnetics (Russian Federation)
Alexander V. Dorofeenko, Institute for Theoretical and Applied Electromagnetics (Russian Federation)
Alexander A. Pukhov, Institute for Theoretical and Applied Electromagnetics (Russian Federation)
Alexey P. Vinogradov, Institute for Theoretical and Applied Electromagnetics (Russian Federation)


Published in SPIE Proceedings Vol. 8457:
Plasmonics: Metallic Nanostructures and Their Optical Properties X
Mark I. Stockman, Editor(s)

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