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Gap-enhanced toroidal dipole and magnetic Fano resonances with polarization independence in all-dielectric metamaterials for sensing
Journal of Nanophotonics ( IF 1.5 ) Pub Date : 2020-11-03 , DOI: 10.1117/1.jnp.14.046006
Wudeng Wang 1 , Jianguang Qi 1 , Baoying Li 1
Affiliation  

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.

中文翻译:

用于传感的全介电超材料中具有极化独立性的间隙增强环形偶极子和磁场 Fano 共振

摘要。我们在用于传感的全介电超材料中同时设计并数值分析了间隙增强环形偶极子 (TD) 和具有高 Q 因子和大调制深度的 Fano 共振。通过在圆柱体中引入间隙,与在近红外区域没有间隙的圆柱体相比,我们实现了 Q 因子和电磁场的显着增强。此外,TD 和 Fano 共振可以通过改变间隙的宽度和位置来定制,并且可以在不破坏对称性的情况下实现,显示出与极化无关的特性。此外,我们从理论上证明了一种多通道折射率 (RI) 传感器,其体 RI 灵敏度超过 100 nm / RIU,品质因数达到 260。由于所提出的超材料具有高结构对称性,它可能会在激光、
更新日期:2020-11-03
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