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 loss in metal nanoparticles is exactly compensated by the gain. This shows that spasers may be used as inclusions in designing lossless metamaterials.

© 2011 Optical Society of America

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