Realizing Strong Light-Matter Interactions between Single-Nanoparticle Plasmons and Molecular Excitons at Ambient Conditions
Journal article, 2015

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/root V as high as similar to 6 x 10(3) mu m(-3/2), 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.


Gülis Zengin

Chalmers, Applied Physics, Bionanophotonics

Martin Wersäll

Chalmers, Applied Physics, Bionanophotonics

Sara Nilsson

Chalmers, Applied Physics, Bionanophotonics

Tomasz Antosiewicz

Chalmers, Applied Physics, Bionanophotonics

Mikael Käll

Chalmers, Applied Physics, Bionanophotonics

Timur Shegai

Chalmers, Applied Physics, Bionanophotonics

Physical Review Letters

0031-9007 (ISSN) 1079-7114 (eISSN)

Vol. 114 15 Art. no. 157401- 157401

Subject Categories

Other Engineering and Technologies

Atom and Molecular Physics and Optics

Other Electrical Engineering, Electronic Engineering, Information Engineering



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