Journal
PLASMONICS
Volume 8, Issue 4, Pages 1627-1631Publisher
SPRINGER
DOI: 10.1007/s11468-013-9580-4
Keywords
Surface plasmon polaritons; Coupled resonators; Fano resonances; Sensor; Phase analysis
Funding
- National Natural Science Foundation of China [11204018, 61177085, 51172030]
- National Basic Research Program of China [2010CB923200, 2009CB930504, 2013CB328704]
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Fano resonances are numerically predicted in an ultracompact plasmonic structure, comprising a metal-isolator-metal (MIM) waveguide side-coupled with two identical stub resonators. This phenomenon can be well explained by the analytic model and the relative phase analysis based on the scattering matrix theory. In sensing applications, the sensitivity of the proposed structure is about 1.1 x 10(3) nm/RIU and its figure of merit is as high as 2 x 10(5) at lambda=980 nm, which is due to the sharp asymmetric Fano line-shape with an ultra-low transmittance at this wavelength. This plasmonic structure with such high figure of merits and footprints of only about 0.2 mu m(2) may find important applications in the on-chip nano-sensors.
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