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 × 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 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.
- Publication:
-
Science
- Pub Date:
- June 2020
- DOI:
- 10.1126/science.abb1570
- arXiv:
- arXiv:2002.00366
- Bibcode:
- 2020Sci...368.1219E
- Keywords:
-
- PHYSICS;
- Physics - Optics;
- Condensed Matter - Materials Science;
- Physics - Applied Physics
- E-Print:
- Science 368, 1219-1223 (2020)