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基于表面等离激子受激辐射放大原理,提出了一种应用于表面增强拉曼散射(SERS)单分子探测的领结型纳米天线结构。采用有限元方法(FEM)研究其局域表面等离子体共振(LSPR)和SERS特性。结果表明,该领结型纳米天线的局域表面等离子体共振强度和局域电场强度得到明显的增强,其散射截面为非表面等离激子受激辐射放大领结型纳米天线的1.1×104倍,局域电场强度为1×102倍。同时,该领结型纳米天线的表面增强拉曼散射增强因子最大达到1016,足以进行精确的单分子探测;整个纳米天线表面的增强因子也可达到1012,足以应用于单个生物分子的探测。
Based on the principle of surface plasmon excitatory radiation amplification, a bow-tie nano-antenna structure for surface-enhanced Raman scattering (SERS) single-molecule detection is proposed. Finite element method (FEM) was used to study its LSPR and SERS properties. The results show that the local surface plasmon resonance intensity and the local electric field strength of the bowtie-type nano-antenna are obviously enhanced. The scattering cross-section of the bowtie-type nano-antenna is 1.1 × 104 times larger than that of non-surface plasmon stimulated radiation amplification bowtie type nano- Local electric field strength of 1 × 102 times. At the same time, the surface enhanced Raman scattering enhancement factor of the tie-shaped nano-antenna is up to 1016, which is enough for accurate single-molecule detection. The enhancement factor of the entire nano-antenna surface can reach 1012, which is enough for the detection of a single biomolecule.