并排相切纳米球同二聚体中的表面等离子体共振和强电场增强

Plasmon resonances and strong electric field enhancements in side-by-side tangent nanospheroid homodimers.

作者信息

Li J N, Liu T Z, Zheng H R, Gao F, Dong J, Zhang Z L, Zhang Z Y

机构信息

School of Physics and Information Technology, Shaanxi Normal University, Xi’an 710062, China.

出版信息

Opt Express. 2013 Jul 15;21(14):17176-85. doi: 10.1364/OE.21.017176.

DOI:10.1364/OE.21.017176

PMID:23938564

Abstract

The plasmon resonance and electric field enhancement in a side-by-side tangent nanospheroid homodimer (TNSHD) have been investigated theoretically by using DDA and FDTD methods, respectively. The simulation results indicate that this side-by-side TNSHD has its novel optical properties. We find that the plasmon resonance with a distinct Fano lineshape can be achieved and the electric field intensity can be enhanced strongly. The tunability of the Fano resonance could provide important applications in biosensing. The obtained electric field enhancement might open a promising pathway for surface-enhanced Raman scattering (SERS) and light trapping in solar cells.

摘要

分别采用离散偶极近似（DDA）方法和时域有限差分（FDTD）方法，从理论上研究了并排相切纳米球壳同型二聚体（TNSHD）中的等离子体共振和电场增强。模拟结果表明，这种并排的TNSHD具有其新颖的光学特性。我们发现，可以实现具有独特的法诺线形的等离子体共振，并且电场强度可以得到显著增强。法诺共振的可调谐性可为生物传感提供重要应用。所获得的电场增强可能为表面增强拉曼散射（SERS）以及太阳能电池中的光捕获开辟一条有前景的途径。