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本文利用数值模拟的方法研究了两种不同的非对称领结型纳米孔结构的光学特性。对于偏置间隙的领结型纳米孔,其基模共振与孔的周长呈线性关系。并且,不同的间隙尺寸对间隙偏置的敏感度不同。对于间隙的一边的结构发生变化的领结型纳米孔,基模共振可以通过改变单个几何参量(剩余部分的高度h2)进行线性调制。另外,研究中还观察到了类Fabry-Perot共振的共振峰分裂。我们在这项工作中提出的这两种打破领结型纳米孔的对称性的方法可以灵活地对领结型纳米孔结构的共振进行操控。
In this paper, the optical properties of two different asymmetric bow-tie nanopore structures have been investigated by numerical simulation. For the bow-tie nanohole with offset gap, the fundamental mode resonance has a linear relationship with the perimeter of the hole. Also, the sensitivity of the gap to different gap sizes is different. For bow tie nano-holes where the structure of one side of the gap changes, the fundamental mode resonance can be linearly modulated by changing a single geometric parameter (the height h2 of the remaining part). In addition, resonance-like cleavage of Fabry-Perot-like resonance was also observed in the study. The two methods we have proposed in this work to break the symmetry of the bowtie nanopore provide the flexibility to manipulate the resonance of the bowtie nanopore structure.