Optical properties of Au-Ag nanosphere dimer: Influence of interparticle spacing

被引：13
|
作者：
Luo, Daobin [1 ]
Shi, Bo [2 ]
Zhu, Qiao [1 ]
Qian, Lailai [1 ]
Qin, Yipan [1 ]
Xie, Jiaojiao [1 ]
机构：
[1] Shaanxi Univ Sci & Technol, Sch Arts & Sci, Xian 710021, Shaanxi, Peoples R China
[2] Shaanxi Univ Sci & Technol, Sch Mat Sci & Engn, Xian 710021, Shaanxi, Peoples R China
来源：
OPTICS COMMUNICATIONS | 2020年 / 458卷 / 458期
关键词：
Homo-dimer; Hetero-dimer; Polarization; Extinction peak; Local electric field; DISCRETE-DIPOLE APPROXIMATION; NEAR-FIELD ENHANCEMENT; NANOPARTICLES; SCATTERING; ABSORPTION; LIGHT;
D O I：
10.1016/j.optcom.2019.124746
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
In this paper, the extinction and near-field properties of Au-Au, Ag-Ag nanosphere homo-dimer and AuAg nanosphere hetero-dimer were studied by using the discrete dipole approximation method. The relation between extinction and interparticle spacing was investigated under y- polarization (perpendicular to dimer axis) and z-polarization (parallel to dimer axis) incidence. The results show that the both extinction peak position and enhancement factor of electric field are sensitive to interparticle spacing when the dimer is illuminated by z-polarization incidence. For Au-Ag hetero-dimer, double same-intensity extinction peaks in visible band were found by regulating interparticle space under z-polarization incidence, and the experience forum was obtained for realizing the double same-intensity peaks.
引用
收藏
页数：6
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