Dicke superradiance from a plasmonic nanocomposite slab

TL;DR

This paper predicts and develops a theory for Dicke superradiance in a plasmonic nanocomposite slab, showing how surface plasmon polaritons enhance relaxation rates and suggesting potential femtosecond time domain applications.

Contribution

It introduces a first-principles theoretical framework for superradiance in nanocomposite slabs and highlights the role of surface plasmon polaritons in relaxation enhancement.

Findings

Superradiance signal evolution depends on eigenvalues of the susceptibility tensor.

Surface plasmon polaritons at interfaces enhance relaxation rates.

Potential extension of superradiance techniques to femtosecond timescales.

Abstract

The Dicke superradiance from an optically thin nanocomposite slab represented by metal nanoparticles dispersed in a dielectric matrix is predicted and its theory is developed from first principles. It is shown that the superradiance signal evolution is determined by the eigenvalues of the field susceptibility tensor for the slab. The excitation of the system by a pumping pulse in different polarizations as well as in the attenuated total reflection configuration is considered. It is demonstrated that the relaxation rates are enhanced when surface plasmon polaritons are excited at the interface between the substrate and superstrate. These findings can pave a way to the extension of the optical techniques based on the Dicke superradiance to the femtosecond time domain.