Far-field excitation of single graphene plasmon cavities with ultracompressed mode volumes

Itai Epstein, David Alcaraz, Zhiqin Huang, Varun Varma Pusapati, Jean Paul Hugonin, Avinash Kumar, Xander M. Deputy, Tymofiy Khodkov, Tatiana G. Rappoport, Jin Yong Hong, Nuno M.R. Peres, Jing Kong, David R. Smith, Frank H.L. Koppens

Research output: Contribution to journalArticlepeer-review

Abstract

Acoustic graphene plasmons are highly confined electromagnetic modes carrying large momentum and low loss in the mid-infrared and terahertz spectra. However, until now they have been restricted to micrometer-scale areas, reducing their confinement potential by several orders of magnitude. Using a graphene-based magnetic resonator, we realized single, nanometer-scale acoustic graphene plasmon cavities, reaching mode volume confinement factors of ~5 × 1010. Such a cavity acts as a mid-infrared nanoantenna, which is efficiently excited from the far field and is electrically tunable over an extremely large broadband spectrum. Our approach provides a platform for studying ultrastrongcoupling phenomena, such as chemical manipulation via vibrational strong coupling, as well as a path to efficient detectors and sensors operating in this long-wavelength spectral range.

Original languageEnglish
Pages (from-to)1219-1223
Number of pages5
JournalScience
Volume368
Issue number6496
DOIs
StatePublished - 12 Jun 2020
Externally publishedYes

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