摘要
The optical properties of a three-arm plasmonic nanoantenna with and without broken symmetry were analyzed in detail. For the symmetrical structure, the local electric field can be significantly enhanced and well confined within the feed gap, whilst the extinction spectrum illustrates polarization independence. With broken symmetry, multi-wavelength resonances are observed due to the single dipole resonance and dipole–dipole coupling effect, and wide tunability is also available through minor structural adjustment. Especially when illuminated by a circularly polarized light beam, the extinction and the electric field distribution can be effectively modulated by just varying the incident wavelength.
The optical properties of a three-arm plasmonic nanoantenna with and without broken symmetry were analyzed in detail. For the symmetrical structure, the local electric field can be significantly enhanced and well confined within the feed gap, whilst the extinction spectrum illustrates polarization independence. With broken symmetry, multi-wavelength resonances are observed due to the single dipole resonance and dipole–dipole coupling effect, and wide tunability is also available through minor structural adjustment. Especially when illuminated by a circularly polarized light beam, the extinction and the electric field distribution can be effectively modulated by just varying the incident wavelength.
作者
王勉
殷澄
马佑桥
周骏
钟汉华
陈险峰
Mian Wang;Cheng Yin;Youqiao Ma;Jun Zhou;Hanhua Zhong;Xianfeng Chen(Institute of Photonics, Faculty of Science, Ningbo University, Ningbo 315211, China;Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China;Department of Electrical and Computer Engineering, Dalhousie University, Halifax, NS B3J 2X4, Canada)
基金
supported by the National Natural Science Foundation of China(Grant Nos.61320106014,61405117,and 61675104)
the K.C.Wong Magna Fund in Ningbo University,China
