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Discrete Light Spectrum of Complex Shaped Meta-Atoms

Silva, Solange Silva ; Morgado, T. A. ; Silveirinha, M. G.

Radio Science Vol. 53, Nº -, pp. 144 - 153, January, 2018.

ISSN (print): 0048-6604
ISSN (online): 0048-6604

Journal Impact Factor: 1,092 (in 2008)

Digital Object Identifier: 10.1002/2017RS006381

Abstract
We investigate the potentials of open plasmonic resonators (meta-atoms) with different shapes in the context of light trapping. Consistent with the theory of [M. G. Silveirinha, Phys. Rev. A, 89, 023813, 2014] it is found that in some conditions complex-shaped dielectric cavities may support discrete light states screened by volume plasmons that in the limit of a vanishing material loss have an infinite lifetime. The embedded eigenstates can be efficiently pumped with a plane wave excitation when the meta-atom core has a nonlinear response, such that the trapped light energy is precisely quantized.