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Tönu Pullerits. Portrait.

Tönu Pullerits

Professor

Tönu Pullerits. Portrait.

Understanding radiative transitions and relaxation pathways in plexcitons

Author

  • Daniel Finkelstein-Shapiro
  • Pierre Adrien Mante
  • Sema Sarisozen
  • Lukas Wittenbecher
  • Iulia Minda
  • Sinan Balci
  • Tõnu Pullerits
  • Donatas Zigmantas

Summary, in English

Molecular aggregates on plasmonic nanoparticles have emerged as attractive systems for the studies of polaritonic light-matter states, called plexcitons. Such systems are tunable, scalable, easy to synthesize, and offer sub-wavelength confinement, all while giving access to the ultrastrong light-matter coupling regime, promising a plethora of applications. However, the complexity of these materials prevented the understanding of their excitation and relaxation phenomena. Here, we follow the relaxation pathways in plexcitons and conclude that while the metal destroys the optical coherence, the molecular aggregate coupled to surface processes significantly contributes to the energy dissipation. We use two-dimensional electronic spectroscopy with theoretical modeling to assign the different relaxation processes to either molecules or metal nanoparticle. We show that the dynamics beyond a few femtoseconds has to be considered in the language of hot electron distributions instead of the accepted lower and upper polariton branches and establish the framework for further understanding.

Department/s

  • Chemical Physics
  • NanoLund: Centre for Nanoscience
  • eSSENCE: The e-Science Collaboration

Publishing year

2021

Language

English

Pages

1092-1107

Publication/Series

Chem

Volume

7

Issue

4

Document type

Journal article

Publisher

Elsevier

Topic

  • Atom and Molecular Physics and Optics
  • Physical Chemistry (including Surface- and Colloid Chemistry)

Keywords

  • cavity quantum electrodynamics
  • excitation energy dissipation
  • molecular aggregates
  • open quantum systems
  • plasmons
  • plexcitons
  • polaritons
  • SDG7: Affordable and clean energy
  • two-dimensional electronic spectroscopy

Status

Published

ISBN/ISSN/Other

  • ISSN: 2451-9308