Observation of Aulter–Townes splitting in subwavelength grating metamaterial ring resonators
Wanxin Li,
Jiewen Li,
Lin Yu,
Yang Feng,
Yong Yao,
Yunxu Sun,
Yi Zou,
Xiaochuan Xu
Affiliations
Wanxin Li
State Key Laboratory on Tunable Laser Technology, Harbin Institute of Technology, Shenzhen, Xili University Town, Harbin Institute of Technology campus, Shenzhen, Guangdong 518055, China
Jiewen Li
State Key Laboratory on Tunable Laser Technology, Harbin Institute of Technology, Shenzhen, Xili University Town, Harbin Institute of Technology campus, Shenzhen, Guangdong 518055, China
Lin Yu
State Key Laboratory on Tunable Laser Technology, Harbin Institute of Technology, Shenzhen, Xili University Town, Harbin Institute of Technology campus, Shenzhen, Guangdong 518055, China
Yang Feng
State Key Laboratory on Tunable Laser Technology, Harbin Institute of Technology, Shenzhen, Xili University Town, Harbin Institute of Technology campus, Shenzhen, Guangdong 518055, China
Yong Yao
State Key Laboratory on Tunable Laser Technology, Harbin Institute of Technology, Shenzhen, Xili University Town, Harbin Institute of Technology campus, Shenzhen, Guangdong 518055, China
Yunxu Sun
State Key Laboratory on Tunable Laser Technology, Harbin Institute of Technology, Shenzhen, Xili University Town, Harbin Institute of Technology campus, Shenzhen, Guangdong 518055, China
Yi Zou
School of Information Science and Technology, ShanghaiTech University, Shanghai 201210, China
Xiaochuan Xu
State Key Laboratory on Tunable Laser Technology, Harbin Institute of Technology, Shenzhen, Xili University Town, Harbin Institute of Technology campus, Shenzhen, Guangdong 518055, China
Subwavelength grating metamaterial (SGM) waveguide is typically treated as a homogeneous medium without considering intra-waveguide reflection. However, this approximation is not always valid, especially in resonators. In this paper, we show that the reflection-induced mutual coupling between the clock-wise and counter-clock-wise resonant modes in a subwavelength grating metamaterial waveguide ring resonator (SGMRR) breaks the degeneracy of the two modes, leading to the formation of Autler–Townes splitting. This phenomenon could be leveraged to improve the detection limit of SGMRR-based sensors.
