Ultraconfined plasmons in atomically thin crystalline silver nanostructures
arXiv:2303.11367 · doi:10.1002/adma.202302520
Abstract
The ability to confine light down to atomic scales is critical for the development of applications in optoelectronics and optical sensing as well as for the exploration of nanoscale quantum phenomena. Plasmons in metallic nanostructures can achieve this type of confinement, although fabrication imperfections down to the subnanometer scale hinder actual developments. Here, we demonstrate narrow plasmons in atomically thin crystalline silver nanostructures fabricated by prepatterning silicon substrates and epitaxially depositing silver films of just a few atomic layers in thickness. Combined with on-demand lateral shaping, this procedure allows for an unprecedented control over optical field confinement in the near-infrared spectral region. Specifically, we observe fundamental and higher-order plasmons featuring extreme spatial confinement and high-quality factors that reflect the crystallinity of the metal. Our approach holds potential for the design and exploitation of atomic-scale nanoplasmonic devices in optoelectronics, sensing, and quantum-physics applications.
11 pages, 9 figures, 50 references
References in corpus (9)
- Mid-Infrared Plasmonic Biosensing with Graphene
- Measurement of the optical dielectric function of transition metal dichalcogenide monolayers: MoS2, MoSe2, WS2 and WSe2
- Highly confined low-loss plasmons in graphene-boron nitride heterostructures
- Atomically flat single-crystalline gold nanostructures for plasmonic nanocircuitry
- Gate-tunable negative refraction of mid-infrared polaritons
- Doping-driven topological polaritons in graphene/α-MoO3 heterostructures
- Plasmonics in Atomically-Thin Crystalline Silver Films
- Nanometer-scale photon confinement in topology-optimized dielectric cavities
- Negative refraction in hyperbolic hetero-bicrystals