Spatially-resolved measurement of plasmon dispersion using Fourier-plane spectral imaging

TL;DR

This paper introduces a Fourier-plane spectral imaging technique combined with the Kretschmann-Raether setup to measure plasmon dispersion across the visible spectrum, allowing spatially-resolved analysis of inhomogeneous structures in a single measurement.

Contribution

The paper presents a novel imaging method that enables spatially-resolved plasmon dispersion measurements over the entire visible range, suitable for inhomogeneous samples.

Findings

Successful measurement of plasmonic dispersion in various architectures.

Ability to resolve features as small as 3 μm in a single shot.

Effective application to plasmonic waveguides and inhomogeneous structures.

Abstract

We show that Fourier-plane imaging in conjunction with the Kretschmann-Raether configuration can be used for measuring polariton dispersion with spatial discrimination of the sample, over the whole visible spectral range. We demonstrate the functionality of our design on several architectures, including plasmonic waveguides, and show that our new design enables the measurement of plasmonic dispersion curves of spatially-inhomogeneous structures with features as small as 3{\mu}m, in a single shot.