A terahertz asymmetrically coupled resonator
(ACR) consisting of two different split ring resonators
(SRRs) was designed. Using finite difference time domain
(FDTD), the transmission of ACR and its refractive-index-
based sensing performance were simulated and analyzed.
Results show that the ACR possesses a sharp coupled
transparent peak or high quality factor (Q), its intensity and
bandwidth can be easily adjusted by spacing the two SRRs.
Furthermore, the resonator exhibits high sensitivity of 75
GHz/RIU and figure of merit (FOM) of 4.4, much higher
than the individual SRR sensors. The ACR were fabricated
by using laser-induced and chemical non-electrolytic
plating with copper on polyimide substrate, the transmis-
sion of which measured by terahertz time-domain spectro-
scopy system is in good agreement with simulations.

• A high Q terahertz asymmetrically coupled resonator and its sensing performance