Abstract

It was predicted long ago that ultra-thin metallic films must exhibit unusual optical properties for radiation frequencies from the radio-frequency domain to the infrared domain. A film would remain highly reflective even when it is orders of magnitude thinner than a skin depth at any frequency. Only when the film is a few nanometers thick (depending on the material but not on the frequency) do its reflectivity and transmittivity become equal, while its absorption peaks at 50%. It has been confirmed experimentally and new directions and applications were proposed. We review the electromagnetic theory of the phenomenon and recent developments in the field and present some new results.

© 2018 Optical Society of America

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