Abstract
We have theoretically investigated a plasmonic metal-dielectric-metal (MDM) resonant system with water-based dielectric, which allow easy implementation of up to eight Fano resonant channels. The reported plasmonic MDM system is composed by an end-coupled square ring and three reversed L-shape cavities, which can support bright modes or dark modes that will interact with each other to generate sharp and asymmetric Fano profiles in transmission spectra. Finite-difference time-domain (FDTD) method and multiple interference coupled mode theory (MICMT) are employed to investigate high performances of those Fano resonances, of which sensitivity and figure of merit are high as ~1813 nm/RIU and ~57.77 dB, respectively. The proposed plasmonic MDM resonant system may promote the development of integrated photonic devices for applications in nanoscale optical sensing and optical communications.
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