Tunable Unidirectional Coupling of Surface Plasmon Polaritons Utilizing a V-Shaped Slot Nanoantenna Column

被引：11
作者：
Huang, Feng [1 ,2 ]
Yang, Hanning [1 ,2 ]
Li, Siren [1 ,2 ]
Jiang, Xiangqian [1 ,2 ]
Sun, Xiudong [1 ,2 ]
机构：
[1] Harbin Inst Technol, Dept Phys, Harbin 150001, Peoples R China
[2] Key Lab Microopt & Photon Technol Heilongjiang Pr, Harbin 150001, Peoples R China
来源：
PLASMONICS | 2015年 / 10卷 / 06期
基金：
中国国家自然科学基金;
关键词：
Surface plasmon polaritons; Unidirectional coupling; Polarization-sensitive nanoantenna; Plasmon resonant mode; BROAD-BAND; DIRECTIONAL EXCITATION; LIGHT; INTERFERENCE; REFLECTION; RADIATION; NANOSLITS;
D O I：
10.1007/s11468-015-9988-0
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A polarization-sensitive V-shaped slot nanoantenna column is utilized to realize tunable unidirectional coupling of surface plasmon polaritons (SPP). Two plasmon resonant modes are excited in the V-shaped slot nanoantennas with x- and y-polarized incident light, respectively. The electric fields of coupled SPP show different symmetries corresponding to that of the two resonant modes. Linear combinations of the two resonant modes result in asymmetric SPP intensity distributions. As a result, by controlling the incident polarizations, tunable unidirectional coupling of SPP to two opposite directions perpendicular to the column at different wavelengths are realized. A highest extinction ratio of 36.7 dB is achieved, and the extinction ratio keeps larger than 7 dB within a wavelength of 149 nm.
引用
收藏
页码：1825 / 1831
页数：7
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