# Transdimensional epsilon-near-zero modes in planar plasmonic nanostructures

## TL;DR

This paper investigates epsilon-near-zero modes in planar plasmonic nanostructures using quantum electrodynamics and nonlocal dielectric models, revealing new effects like mode degeneracy lifting and enhanced emitter coupling.

## Contribution

It introduces a transdimensional approach to epsilon-near-zero modes, demonstrating novel phenomena and potential for controlling spontaneous emission rates.

## Key findings

- Mode degeneracy is lifted in transdimensional regimes.
- Dipole emitters strongly couple to split epsilon-near-zero modes.
- Spontaneous decay rates increase by up to three orders of magnitude.

## Abstract

We use quantum electrodynamics and the confinement-induced nonlocal dielectric response model based on the Keldysh-Rytova electron interaction potential to study the epsilon-near-zero modes of metallic films in the transdimensional regime. New peculiar effects are revealed such as the plasmon mode degeneracy lifting and the dipole emitter coupling to the split epsilon-near-zero modes, leading to thickness-controlled spontaneous decay with up to three-orders-of-magnitude increased rates.