Ultrasmall and tunable TeraHertz surface plasmon cavities at the ultimate plasmonic limit.

ABSTRACT: The ability to confine THz photons inside deep-subwavelength cavities promises a transformative impact for THz light engineering with metamaterials and for realizing ultrastrong light-matter coupling at the single emitter level. To that end, the most successful approach taken so far has relied on cavity architectures based on metals, for their ability to constrain the spread of electromagnetic fields and tailor geometrically their resonant behavior. Here, we experimentally demonstrate a comparatively high level of confinement by exploiting a plasmonic mechanism based on localized THz surface plasmon modes in bulk semiconductors. We achieve plasmonic confinement at around 1 THz into record breaking small footprint THz cavities exhibiting mode volumes as low as [Formula: see text], excellent

SUBMITTER: Aupiais I 

PROVIDER: S-EPMC10667513 | biostudies-literature | 2023 Nov

REPOSITORIES: biostudies-literature