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Tunable Optical Performances on a Periodic Array of Plasmonic Bowtie Nanoantennas with Hollow Cavities

机译:具有空心腔的等离子领结纳米天线周期阵列上的可调光学性能。

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摘要

We propose a design method to tune the near-field intensities and absorption spectra of a periodic array of plasmonic bowtie nanoantennas (PBNAs) by introducing the hollow cavities inside the metal nanostructures. The numerical method is performed by finite element method that demonstrates the engineered hollow PBNAs can tune the optical spectrum in the range of 400–3000 nm. Simulation results show the hollow number is a key factor for enhancing the cavity plasmon resonance with respect to the hotspot region in PBNAs. The design efforts primarily concentrate on shifting the operation wavelength and enhancing the local fields by manipulating the filling dielectric medium, outline film thickness, and hollow number in PBNAs. Such characteristics indicate that the proposed hollow PBNAs can be a potential candidate for plasmonic enhancers and absorbers in multifunctional opto-electronic biosensors.
机译:我们提出一种设计方法,通过在金属纳米结构内部引入中空空腔来调谐等离激元领结纳米天线(PBNA)的周期性阵列的近场强度和吸收光谱。数值方法是通过有限元方法执行的,这表明工程空心PBNA可以在400-3000 nm范围内调谐光谱。仿真结果表明,空洞数是增强PBNA热点区域内腔等离子体激元共振的关键因素。设计工作主要集中在通过操作填充介电介质,轮廓膜厚度和PBNA中的空心数来转移工作波长并增强局部场。这样的特性表明,提出的空心PBNA可能是多功能光电生物传感器中等离子体增强剂和吸收剂的潜在候选者。

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