title: Extremely sub-wavelength THz metal-dielectric wire microcavities.
abstract: We demonstrate minimal volume wire THz metal-dielectric micro-cavities, in which all but one dimension have been reduced to highly sub-wavelength values. The smallest cavity features an effective volume of 0.4 µm(3), which is ~5.10(-7) times the volume defined by the resonant vacuum wavelength (λ = 94 µm) to the cube. When combined with a doped multi-quantum well structure, such micro-cavities enter the ultra-strong light matter coupling regime, even if the total number of electrons participating to the coupling is only in the order of 10(4), thus much less than in previous studies.
authors.affiliation: Univ. Paris Diderot, Sorbonne Paris Cité, Laboratoire Matériaux et Phénomènes Quantiques, UMR7162, 75013 Paris, France.
authors.forename: Cheryl
authors.initials: C
authors.lastname: Feuillet-Palma
authors.forename: Yanko
authors.initials: Y
authors.lastname: Todorov
authors.forename: Robert
authors.initials: R
authors.lastname: Steed
authors.forename: Angela
authors.initials: A
authors.lastname: Vasanelli
authors.forename: Giorgio
authors.initials: G
authors.lastname: Biasiol
authors.forename: Lucia
authors.initials: L
authors.lastname: Sorba
authors.forename: Carlo
authors.initials: C
authors.lastname: Sirtori
mesh_terms: D004553:Electric Conductivity; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008670:Metals / Q000737:chemistry*; D012542:Scattering, Radiation; D020349:Surface Plasmon Resonance / Q000295:instrumentation*; D055053:Terahertz Radiation
chemical_list: D008670:Metals