Near dispersion-less surface plasmon polariton resonances at a metal-dielectric interface

TL;DR

This paper demonstrates the existence of near dispersion-less surface plasmon polariton modes at unpatterned metal-dielectric interfaces with 2-D dielectric patterns, enabling controlled light coupling and mode manipulation.

Contribution

It introduces a novel approach to achieve near dispersion-less SPP modes using unpatterned interfaces with 2-D dielectric patterns, allowing control over mode position and dispersion.

Findings

Near dispersion-less SPP modes observed at unpatterned interfaces.

Mode position and dispersion controlled by geometry and pattern.

Anti-crossings from in-plane mode coupling demonstrated.

Abstract

Omni-directional light coupling to surface plasmon polariton (SPP) modes to make use of plasmon mediated near-field enhancement is challenging. We report possibility of near dispersion-less modes in structures with unpatterned metal-dielectric interfaces having 2-D dielectric patterns on top. We show that the position and dispersion of the excited modes can be controlled by the excitation geometry and the 2-D pattern. The anti-crossings resulting from the in-plane coupling of different SPP modes are also shown.