Monopole Embedded Eigenstate in Nonlocal epsilon-Near Zero Nanostructures

TL;DR

This paper demonstrates that nonlocal epsilon-near zero nanostructures can support monopole embedded eigenstates regardless of size, eliminating the need for precise resonator tuning for light confinement.

Contribution

It introduces a novel mechanism for supporting embedded eigenstates in nonlocal nanostructures without size tuning, expanding the understanding of light localization in open systems.

Findings

Supports multiple embedded eigenstates with monopole symmetry

Enables light confinement without precise size tuning

Highlights the role of nonlocal effects in nanostructures

Abstract

In recent years, the confinement of light in open systems with no radiation leakage has raised great interest in the scientific community, both due to its peculiar and intriguing physics and due to its important technological applications. In particular, materials with near-zero permittivity offer a unique opportunity for light localization, as they enable the formation of embedded eigenstates in core-shell systems with suppressed radiation loss. For all the solutions presented thus far in the literature, the exact suppression of the radiation leakage can occur only when the size of the resonator is delicately tuned. Surprisingly, here it is shown that the tuning of the resonator radius may be unnecessary, and that nonlocal metal spherical nanostructures of any size may support multiple embedded eigenstates with a monopole-type symmetry.