Oscillation threshold of a chain of spasers
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A model of resonance interaction of a chain of periodically spaced metal nanoparticles with a chain of quantum dots is developed. The conditions leading to oscillation in a chain of spasers in the vicinity of narrow plasmon resonances are determined. It is shown that the lowest oscillation threshold can be achieved under anomalously small values of population inversion. In this case, the range of oscillation frequency variation upon changing the resonance frequency of quantum dots can be substantially narrower that the plasmon-resonance linewidth.
KeywordsDipole Moment Metal Particle Spectral Dependence Population Inversion Narrow Resonance
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