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Double Fano resonances in an individual metallic nanostructure for high sensing sensitivity

机译：单个金属纳米结构中的双迷孔共振，用于高感测灵敏度

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In this paper, we report on the design and observation of double Fano resonances (DFRs) in an individual symmetry-reduced nanostructure and the induced high sensing sensitivity. Such a plasmonic nanostructure consists of a partially overlapped double-metallic nanotriangles with unequal sizes fabricated by using fast and low-cost angle-resolved nanosphere lithography. Symmetry breaking generates two narrow quadrupolar dark modes, which further enhance the coupling with fundamental bright dipole modes within the same structure, manifesting the effect of DFRs. The resonance wavelength and line shape of DFRs can be tailored by changing the degree of asymmetry as well as the size of the designed nanostructure. Based on DFRs, a high sensitivity to dielectric environment with a maximum figure of merit of 35 is measured. Due to a fast manufacturing process with high reproducibility and high structural tunability, the fabricated individual metallic nanostructure provides an opportunity for significant potential applications in localized surface plasmon resonance based single or double-wavelength sensors in the near-infrared region.
机译：本文报告了单个对称减少纳米结构中双扇形共振（DFR）的设计和观察以及诱导的高感测灵敏度。这种等离子体纳米结构由具有通过使用快速和低成本角度分辨的纳米光刻制造的具有不相等的尺寸的部分重叠的双金属纳米前缘。对称性断裂产生两个窄的四极暗模式，这进一步增强了与相同结构内的基本亮偶极模式的耦合，表现为DFR的效果。可以通过改变不对称程度以及设计的纳米结构的尺寸来定制DFR的共振波长和线形状。基于DFRS，测量具有最大介电环境的高灵敏度，最大值为35的介电环境。由于具有高再现性和高结构可调性的制造过程，所制造的单个金属纳米结构为近红外区域中的局部表面等离子体共振的单个或双波长传感器提供了重要的潜在应用。

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