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Ultrastrong coupling between nanoparticle plasmons and cavity photons at ambient conditions

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cris.lastimport.scopus2024-02-12T20:38:43Z
dc.abstract.enUltrastrong coupling is a distinct regime of electromagnetic interaction that enables a rich variety of intriguing physical phenomena. Traditionally, this regime has been reached by coupling intersubband transitions of multiple quantum wells, superconducting artificial atoms, or two-dimensional electron gases to microcavity resonators. However, employing these platforms requires demanding experimental conditions such as cryogenic temperatures, strong magnetic fields, and high vacuum. Here, we use a plasmonic nanorod array positioned at the antinode of a resonant optical Fabry-Pérot microcavity to reach the ultrastrong coupling (USC) regime at ambient conditions and without the use of magnetic fields. From optical measurements we extract the value of the interaction strength over the transition energy as high as g/ω ~ 0.55, deep in the USC regime, while the nanorod array occupies only ∼4% of the cavity volume. Moreover, by comparing the resonant energies of the coupled and uncoupled systems, we indirectly observe up to ∼10% modification of the ground-state energy, which is a hallmark of USC. Our results suggest that plasmon-microcavity polaritons are a promising platform for room-temperature USC realizations in the optical and infrared ranges, and may lead to the long-sought direct visualization of the vacuum energy modification.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorShegai, Timur
dc.contributor.authorRousseaux, Benjamin
dc.contributor.authorJohansson, Göran
dc.contributor.authorCanales, Adriana
dc.contributor.authorZhukova, Elena
dc.contributor.authorBisht, Ankit
dc.contributor.authorBaranov, Denis G.
dc.contributor.authorMunkhbat, Battulga
dc.contributor.authorAntosiewicz, Tomasz
dc.date.accessioned2024-01-26T11:18:22Z
dc.date.available2024-01-26T11:18:22Z
dc.date.issued2020
dc.description.financePublikacja bezkosztowa
dc.description.number1
dc.description.volume11
dc.identifier.doi10.1038/S41467-020-16524-X
dc.identifier.issn2041-1723
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/124106
dc.identifier.weblinkhttp://www.nature.com/articles/s41467-020-16524-x.pdf
dc.languageeng
dc.pbn.affiliationphysical sciences
dc.relation.ispartofNature Communications
dc.relation.pages2715
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.subject.enNanocavities
dc.subject.enNanophotonics and plasmonics
dc.subject.enNanoscale materials
dc.titleUltrastrong coupling between nanoparticle plasmons and cavity photons at ambient conditions
dc.typeJournalArticle
dspace.entity.typePublication