Modelling resonant transmission in a Fabry-Perot/Surface-Plasmon microcavity

TL;DR

This paper models the resonant transmission in a Fabry-Perot surface-plasmon microcavity, explaining experimental observations through a simplified transmittance function that captures both Fabry-Perot and surface plasmon resonances.

Contribution

It introduces a straightforward model for resonant transmission in a Fabry-Perot surface-plasmon cavity, linking experimental data with theoretical resonance conditions.

Findings

Model accurately fits experimental transmission data

Resonance conditions derived for both Fabry-Perot and surface plasmon regimes

Simplified transmittance function effectively describes the system

Abstract

Coupled surface plasmons arise in the surfaces of a dielectric layer between two metallic media when a dim wave propagating in the dielectric generates resonant free charge oscillations at the interfaces. Here, we consider surface plasmon resonance in a Fabry-Perot type cavity with plane metallic mirrors and an inner dielectric medium, optically less dense than the outer surrounding dielectric medium. The experimentally observed transmission as a function of both the angle of incidence of light and the wavelength is well modelled by an elementary transmittance function from which resonance conditions are obtained both in the Fabry-Perot and Surface-Plasmon regime.