Dipole Response of Spaser on an External Optical Wave

TL;DR

This paper investigates the conditions under which a Bergman-Stockman spaser's dipole moment oscillates out of phase with an external field, enabling loss compensation in metamaterials.

Contribution

It identifies specific amplitude and frequency conditions for loss compensation in spasers, advancing their application in lossless metamaterials.

Findings

Dipole moment oscillates in antiphase with external field.

Losses in metal nanoparticles can be exactly compensated.

Spasers can be used as inclusions in lossless metamaterials.

Abstract

We find the conditions upon the amplitude and frequency of an external electromagnetic field at which the dipole moment of a Bergman-Stockman spaser oscillates in antiphase with the field. For these values of the amplitude and frequency the losses in metal nanoparticles is exactly compensated of by gain. This shows that spasers may be used as inclusions in designing lossless metamaterials.