Multiple Embedded Eigenstates in Nonlocal Plasmonic Nanostructures

Abstract

Trapping light in open cavities is a long sought "holy grail" of nanophotonics. Plasmonic materials may offer a unique opportunity in this context, as they may fully suppress the radiation loss and enable the observation of spatially localized light states with infinite lifetime in an open system. Here, we investigate how the spatial dispersion effects, e.g., caused by the electron-electron interactions in a metal, affect the trapped eigenstates. Heuristically, one may expect that the repulsive-type electron-electron interactions should act against light localization, and thereby that they should have a negative impact on the formation of the embedded eigenstates. Surprisingly, here we find that the nonlocality of the material response creates new degrees of freedom and relaxes the requirements for the observation of trapped light. In particular, a zero-permittivity condition is no longer mandatory and the same resonator shell can potentially suppress the radiation loss at multiple frequencies.

References in corpus (7)

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Cited by in corpus (5)

• Berreman Embedded Eigenstates for Narrowband Absorption and Thermal Emission
• Capturing Broadband Light in a Compact Bound State in the Continuum
• Ill-defined Topological Phases in Dispersive Photonic Crystals
• Monopole Embedded Eigenstate in Nonlocal epsilon-Near Zero Nanostructures
• Loss-driven topological transitions in lasing