标题：Plasmon resonance enhanced optical transmission and magneto-optical Faraday effects in nanohole arrays blocked by metal antenna
作者：Lei, Chengxin; Tang, Zhixiong; Wang, Sihao; Li, Daoyong; Chen, Leyi; Tang, Shaolong; Du, Youwei
作者机构：[Lei, Chengxin; Tang, Zhixiong; Wang, Sihao; Li, Daoyong; Chen, Leyi; Tang, Shaolong; Du, Youwei] Nanjing Univ, Nanjing Natl Lab Microstruct, Collabor 更多
通讯作者地址：[Tang, SL]Nanjing Univ, Nanjing Natl Lab Microstruct, Collaborat Innovat Ctr Adv Microstruct, Jiangsu Key Lab Nanotechnol, Nanjing 210093, Jiangsu, Pe 更多
关键词：Magneto-optical Faraday effects; Extraordinary optical transmission;; Surface plasmon polaritons; Localized surface plasmon resonance; Figure; of merit; The FDTD method
摘要：The properties of the optical and magneto-optical effects of an improved plasmonic nanohole arrays blocked by gold mushroom caps are investigated by using the finite difference time domain (FDTD) method. It is most noteworthy that the strongly enhanced Faraday rotation along with high transmittance has been achieved simultaneously by optimizing the parameters of nanostructure in a broad spectrum spanning visible to near infrared frequencies, which is very important in practical application for designing novel optical and magneto optical devices. In our designed structure, we obtained two extraordinary optical transmission (EOT) resonant peaks along with enhanced Faraday rotation and two peaks of the figure of merit (FOM). By optimizing the geometrical parameters of the structure, we can obtain an almost 10-fold enhancement of Faraday rotation with a corresponding transmittance 50%, and the FOM of 0.752 at the same wavelength. As expected, the optical and magneto-optical effects sensitively depends on the geometrical parameters of our structure, which can be simply tailored by the height of pillar, the diameter of mushroom cap, and the period of the structure, and so on. The physical mechanism of these physical phenomena in the paper has been explained in detail. These research findings are of great theoretical significance in developing the novel magneto-optical devices in the future.