Nanoscale capacitive tuning of three dimensional terahertz meta-atoms
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.
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BibTeX
@article{iqbal2026nanoscale,
title = {{Nanoscale capacitive tuning of three dimensional terahertz meta-atoms}},
author = {Usama Iqbal and Dmytro B. But and Théo Hannotte and Peretti Romain and Alexis Jouan and Cheryl Feuillet-Palma and Yanko Todorov},
journal = {Optics Express},
year = {2026},
month = aug,
doi = {10.1364/oe.605013},
url = {https://hal.science/hal-05734638v1},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Nanoscale capacitive tuning of three dimensional terahertz meta-atoms
AU - Usama Iqbal
AU - Dmytro B. But
AU - Théo Hannotte
AU - Peretti Romain
AU - Alexis Jouan
AU - Cheryl Feuillet-Palma
AU - Yanko Todorov
PY - 2026
DA - 2026/08/10
JO - Optics Express
DO - 10.1364/oe.605013
UR - https://hal.science/hal-05734638v1
AB - 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.
SN - 1094-4087
ER -