Antenna-coupled microcavities for terahertz emission

Journal Article · Mon Jan 20 04:00:00 EST 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4863055· OSTI ID:22280596

Todorov, Y.; Sirtori, C. ^[1]

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1. Université Paris Diderot, Sorbonne Paris Cité, Laboratoire Matériaux et Phénomènes Quantiques, UMR7162, 75013 Paris (France)

We have investigated the capacitive coupling between dipolar antennas and metal-dielectric-metal wire microcavities with strong sub-wavelength confinement in the terahertz region. The coupling appears in reflectivity measurements performed on arrays of antenna-coupled elements, which display asymmetric Fano lineshapes. The experimental data are compared to a temporal coupled-mode theory and finite elements electromagnetic simulations. We show that the Fano interferences correspond to coupling between a subradiant mode (microcavity) and a superradiant mode (antennas). This phenomenon allows one to enhance and control the radiative coupling of the strongly confined mode with the vacuum. These concepts are very useful for terahertz optoelectronic devices based on deep-sub-wavelength active regions.

• OSTI ID: 22280596
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 3 Vol. 104; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTENNAS
ASYMMETRY
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
COUPLING
DIELECTRIC MATERIALS
INTERFERENCE
METALS
REFLECTIVITY
SUPERRADIANCE
THZ RANGE
WAVELENGTHS