Journal
OPTICS EXPRESS
Volume 17, Issue 17, Pages 15372-15380Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.17.015372
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- National Science Council (NSC) [95-2112-M-007 048 MY3]
- National Nano Device Laboratories [NDL-94S-C142]
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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. (C) 2009 Optical Society of America
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