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

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 × 10 –10 . 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 ultrastrong-coupling 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.
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https://hal-iogs.archives-ouvertes.fr/hal-03350926
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Submitted on : Tuesday, September 21, 2021 - 5:05:50 PM
Last modification on : Thursday, September 23, 2021 - 3:33:24 AM

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Itai Epstein, David Alcaraz, Zhiqin Huang, Varun-Varma Pusapati, Jean-Paul Hugonin, et al.. Far-field excitation of single graphene plasmon cavities with ultracompressed mode volumes. Science, American Association for the Advancement of Science, 2020, 368 (6496), pp.1219-1223. ⟨10.1126/science.abb1570⟩. ⟨hal-03350926⟩

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