Experimental Observation of Dynamic Transmission Lineshapes in a Robust SNAP Microbottle-Taper Coupling System

IEEE Photonics Journal

Sifan Zeng¹  Lingjun Meng²  Keyi Wang²  Yu Yang²  Mengyu Wang²  Lei Zhang²  Yongchao Dong³  Xueying Jin⁴  Wenbin Xu⁵ 

[1] Department of Engineering and Applied Physics, University of Science and Technology of China, Hefei, China;Department of Precision and Precision Instrumentation, University of Science and Technology of China, Hefei, China;School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou, China;School of Instrument Science and Technology, Hefei University of Technology, Hefei, China;Science and Technology on Optical Radiation Laboratory, Beijing, China;

关键词: Microresonators;    whispering-gallery mode;    Fano-like resonance;    transmission lineshapes.;   

DOI  :  10.1109/JPHOT.2019.2948300

来源: DOAJ

【 摘 要 】

Fano-like lineshapes in whispering-gallery modes (WGMs) microresonators are of critical for many actual applications, such as high-sensitivity sensors, slow light, and optical switches. In this paper, we theoretically and experimentally demonstrate dynamic transmission lineshapes, including Lorentzian lineshapes, Fano-like lineshapes and gain-like lineshapes, with a simple system, where a surface nanoscale axial photonic (SNAP) microbottle is coupled to the transition of a tapered fiber by carefully choosing tapered fiber diameters. Controlled and robust coupling with a clean and almost equidistant spectrum for different axial modes is achieved while maintaining contact between the resonator and the taper. Our device offers five similar dynamic transmission lineshapes arranged in order simultaneously, demonstrating stable tuning and a high number of potential degrees of freedom in contrast to other coupling systems for single- or double-coupled microresonators. By using coupled-mode theory, these transmission lineshapes are fitted to explain these experiment observations. We also explore a tunable transmission spectra obtained by increasing the powers of the input laser. Our approach hold unique potential in sensitivity-enhanced sensing, quantum information processing, and all-optical switching.

【 授权许可】

Unknown