Abstract
Most metals have negative dielectric functions and their surfaces support plasma modes that couple to incident light. Focusing of surface plasma modes is not restricted by the free space wavelength offering the possibility of huge concentrations of radiative energy in very small volumes. In a recent refinement1 we showed that at the frequency where \epsilon = -1 a highly conducting metal such as silver can act as a lens, refocusing electrostatic fields defined in some object plane, into an image plane some distance away.
© 2001 Optical Society of America
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