Issue 40, 2023

Ultrafast dynamics in plasmon–exciton core–shell systems: the role of heat

Abstract

Strong coupling between plasmons and excitons gives rise to new hybrid polariton states with potential applications in various fields. Despite a plethora of research on plasmon–exciton systems, their transient behaviour is not yet fully understood. Besides Rabi oscillations in the first few femtoseconds after optical excitation, coupled systems show interesting non-linear features on the picosecond time scale. Here, we conclusively show that the source of these features is heat that is generated inside the particles. Until now, this hypothesis was only based on phenomenological arguments. We investigate the role of heat by recording the transient spectra of plasmon–exciton core–shell nanoparticles with excitation off the polariton resonance. We present analytical simulations that precisely recreate the measurements solely by assuming an initial temperature rise of the electron gas inside the particles. The simulations combine established strategies for describing uncoupled plasmonic particles with a recently published model for static spectra. The simulations are consistent for various excitation powers, confirming that heating of the particles is indeed the root of the changes in the transient signals.

Graphical abstract: Ultrafast dynamics in plasmon–exciton core–shell systems: the role of heat

Article information

Article type
Paper
Submitted
13 jun 2023
Accepted
26 aug 2023
First published
01 sep 2023

Nanoscale, 2023,15, 16307-16313

Ultrafast dynamics in plasmon–exciton core–shell systems: the role of heat

F. Stete, M. Bargheer and W. Koopman, Nanoscale, 2023, 15, 16307 DOI: 10.1039/D3NR02817H

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