Open AccessAsymmetric coupling between subradiant and superradiant plasmonic resonances and its enhanced sensing performance
Author(s) -
Chia Yun Chen,
Ieng-Wai Un,
Nyan Hwa Tai,
TaJen Yen
Publication year - 2009
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.17.015372
Subject(s) - transmittance , electromagnetically induced transparency , plasmon , resonator , figure of merit , physics , split ring resonator , optics , coupling (piping) , metamaterial , resonance (particle physics) , q factor , optoelectronics , excitation , materials science , atomic physics , quantum mechanics , metallurgy
We present symmetric and asymmetric couplings within a pair of split-ring resonators (SRRs). The former shows a single transmittance dip, following the equivalent circuit model; yet, the latter introduces an additional transmittance peak, stemming from an asymmetrically coupled resonance (ACR) between the subradiant and superradiant modes. The mechanism of such induced transparency is elucidated well by the suppression of induced currents within the SRR element with a lower quality factor. Finally, the excitation of ACR is further associated with remarkable confinement of electromagnetic field, providing a compelling sensing performance based on its excellent sensitivity and figure of merit.