Abstract
We have designed and numerically analyzed gap-enhanced toroidal dipole (TD) and magnetic Fano resonances with high Q-factors and large modulation depths simultaneously in an all-dielectric metamaterial for sensing. By introducing a gap in the cylinder, we achieved a significant enhancement in Q-factor and electromagnetic field compared to the cylinder with no gap in near-IR regime. In addition, TD and magnetic Fano resonances can be tailored through varying width and position of gap and can be achieved without symmetry breaking, showing polarization-independent characteristics. Further, we theoretically demonstrated a multichannel refractive index (RI) sensor with bulk RI sensitivity exceeding 100 nm / RIU and figure of merit reaching 260. With high structural symmetry of the proposed metamaterial, it may find applications in lasing, nonlinear devices, and multiwavelength biomedical sensing.
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