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In-plane plasmonic modes of negative group velocity in perforated waveguides

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Abstract

Eigenmodes in a typical perforated metal-insulator-metal waveguide structure have been analyzed. It is shown that the lowest eigenmode originates from a plasmonic waveguide mode between metallic layers and has net negative group velocity on the lower branch under TM polarization. The negative group velocity is directly derived from the dispersion curve in the plane of in-plane wave number and photon energy, and is responsible for the negative refraction effect reported in fishnet metamaterials.

© 2011 Optical Society of America

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