Abstract

The debate on the underlying physics of the extraordinary optical transmission (EOT) through a metallic nano-slit surrounded with periodic grooves is largely resolved. We clarify that the EOT originates from the interference between the slit modes excited by the incident light and by the groove-generated surface plasmon polaritons modulated by the horizontal Fabry–Perot resonance effect due to the surrounding grooves. The quantitative model derived will greatly simplify the design of such structures.

© 2010 Optical Society of America

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