Nanoscale capacitive tuning of three dimensional terahertz meta-atoms
Year: 2026
Type: article
Abstract: We report terahertz (THz) meta-atom resonators whose resonance can be tuned solely by varying the geometry of nanoscale capacitive elements while keeping the geometry of the inductive loop fixed. The capacitive parts employ a metal–dielectric–metal architecture with subwavelength dimensions, exhibiting strong electric-field confinement. Large shifts of the resonant frequency are obtained by varying the capacitor size, even though these capacitors constitute only a small fraction of the overall resonator dimensions. We also show that the quality factor of the resonators can be substantially improved by reducing the ohmic loss of the inductive loop. The resonators are analyzed using a circuit model that combines lumped elements with a transmission-line section to account for propagation effects in the large inductive loop. Our results establish a scalable platform for compact, geometrically tunable THz meta-atoms suitable for exploring light–matter interaction at the nanoscale.
Source: Optics Express
DOI: 10.1364/oe.605013
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,270
OpenAlex ID: W7171558807