Abstract
We have designed and numerically analyzed high quality-factor, high modulation depth, multiple Fano resonances based on periodical free-standing all-dielectric nanodisk dimer in the near-infrared regime. Multipole Fano resonances arise from the interference between magnetic dipole and subradiant resonances and can be tailored by adjusting geometry. Considering narrow line-width with large field confinement, maximal quality-factor exceed 2750 with the modulation depth reaching nearly 100 %, and bulk refractive index sensitivity exceed 1900 nm/RIU with figure of merit reaching 2576. Our findings enable the engineering of nonlinear response of Fano-type nanoparticle arrays that are relevant to applications ranging from sensors to nonlinear effects.
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