Abstract
Resonances in metal nanostructures supporting propagation of slow surface plasmon-polariton (SPP) modes are considered. Resonant enhancements in scattering and built-up electric fields of nm thin submicron-wide metal strips are investigated using a surface integral equation method and ascribed to the excitation of strip-cavity modes formed by short-range SPPs. A properly positioned narrow gap $(5\phantom{\rule{0.3em}{0ex}}\mathrm{nm})$ in the strip is found to lead, by virtue of boundary conditions, to significant field enhancement ($\ensuremath{\sim}30$, inside the gap), as well as to a noticeable $(\ensuremath{\sim}10%)$ blueshift in the resonance wavelength.
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