Realizing Strong Light-Matter Interactions between Single-Nanoparticle Plasmons and Molecular Excitons at Ambient Conditions

Gülis Zengin, Martin Wersäll, Sara Nilsson, Tomasz J. Antosiewicz, Mikael Käll, and Timur Shegai
Phys. Rev. Lett. 114, 157401 – Published 15 April 2015
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Abstract

Realizing strong light-matter interactions between individual two-level systems and resonating cavities in atomic and solid state systems opens up possibilities to study optical nonlinearities on a single-photon level, which can be useful for future quantum information processing networks. However, these efforts have been hampered by unfavorable experimental conditions, such as cryogenic temperatures and ultrahigh vacuum, required to study such systems and phenomena. Although several attempts to realize strong light-matter interactions at room temperature using plasmon resonances have been made, successful realizations on the single-nanoparticle level are still lacking. Here, we demonstrate the strong coupling between plasmons confined within a single silver nanoprism and excitons in molecular J aggregates at ambient conditions. Our findings show that deep subwavelength mode volumes V together with quality factors Q that are reasonably high for plasmonic nanostructures result in a strong-coupling figure of merit–Q/V as high as 6×103μm3/2, a value comparable to state-of-the-art photonic crystal and microring resonator cavities. This suggests that plasmonic nanocavities, and specifically silver nanoprisms, can be used for room temperature quantum optics.

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  • Received 5 December 2014

DOI:https://doi.org/10.1103/PhysRevLett.114.157401

© 2015 American Physical Society

Authors & Affiliations

Gülis Zengin1, Martin Wersäll1, Sara Nilsson1, Tomasz J. Antosiewicz1,2, Mikael Käll1, and Timur Shegai1,*

  • 1Department of Applied Physics, Chalmers University of Technology, 412 96 Göteborg, Sweden
  • 2Centre of New Technologies, University of Warsaw, Banacha 2c, 02-097 Warszawa, Poland

  • *timurs@chalmers.se

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Vol. 114, Iss. 15 — 17 April 2015

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