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We show that, for the resonant metal-dielectric structures withsub-wavelength confinement of light in all three dimensions, the loss cannot bereduced significantly below the loss of the metal itself unless one operates inthe far IR and THz regions of the spectrum or below. Such high losses cannot becompensated by introducing gain due to Purcell-induced shortening ofrecombination times. The only way low loss optical metamaterials can beengineered is with as yet unknown low loss materials with negativepermittivity.

Scaling of losses with size and wavelength in nanoplasmonics and metamaterials