Tunable Plasmonic Band-Pass Filter with Dual Side-Coupled Circular Ring Resonators
Dongdong Liu,
Jicheng Wang,
Feng Zhang,
Yuewu Pan,
Jian Lu,
Xiaowu Ni
Affiliations
Dongdong Liu
School of Science, Nanjing University of Science & Technology, Nanjing 210094, China
Jicheng Wang
School of Science, Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, Jiangnan University, Wuxi 214122, China
Feng Zhang
Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
Yuewu Pan
School of Mathematics & Physics Science, Xuzhou University of Technology, Xuzhou 221018, China
Jian Lu
School of Science, Nanjing University of Science & Technology, Nanjing 210094, China
Xiaowu Ni
School of Science, Nanjing University of Science & Technology, Nanjing 210094, China
A wavelength band-pass filter with asymmetric dual circular ring resonators in a metal-insulator-metal (MIM) structure is proposed and numerically simulated. For the interaction of the local discrete state and the continuous spectrum caused by the side-coupled resonators and the baffle, respectively, the transmission spectrum exhibits a sharp and asymmetric profile. By adjusting the radius and material imbedded in one ring cavity, the off-to-on plasmon-induced absorption (PIA) optical response can be tunable achieved. In addition, the structure can be easily extended to other similar compact structures to realize the filtering task. Our structures have important potential applications for filters and sensors at visible and near-infrared regions.
