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We propose a plasmonic ellipse resonator possessing hybrid modes based onmetal-insulator-metal (MIM) waveguide system. Specially, this nanocavity hashybrid characteristic of rectangle and disk resonator, therefore supportingboth Fabry-Perot modes (FPMs) and whispering-gallery modes (WGMs). Besides, bychanging the length of major and minor radius of the ellipse, the resonantwavelengths of FPMs and WGMs can be independently tuned and close to eachother, thus constructing a plasmon-induced transparency (PIT) - like spectrumprofile. Benefitting from this, a dual-band slow light is achieved with onesingle resonator. Furthermore, this component can also act as a multi-bandcolor filter and refractive index sensor. We believe such multi-mode resonatorwith ultra-small footprint will play an important role in more compact on-chipoptical circuits in the future.

A plasmonic ellipse resonator possessing hybrid modes for ultracompact chipscale application