Abstract

For periodically corrugated nanowire cross sections, such that the polar-angle dependence of the radius is r=r0[1+uN cos(Nφ)], we calculate both the resonant values of metal permittivity ε and the corresponding plasmonic eigenfunctions. For sufficiently small perturbation amplitudes, NuN≪1, these fundamental characteristics admit full-scale analytical analysis revealing nontrivial plasmonic properties. For NuN>1, the analytical analysis is supplemented by numerical simulations; they show nonlinearly growing redshifts of the main plasmonic resonances with increasing modulation periodicity N and the amplitude uN.

© 2012 Optical Society of America

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