Coupling ideality of standing-wave supermode microresonators  

作　　者：MIN WANG YUECHEN LEI ZHI-GANG HU CHENGHAO LAO YUANLEI WANG XIN ZHOU JINCHENG LI QI-FAN YANG BEI-BEI LI 

机构地区：[1]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics,School of Physics,Peking University,Beijing 100871,China [4]School of Physics,Beihang University,Beijing 100191,China [5]Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China [6]Songshan Lake Materials Laboratory,Dongguan 523808,China

出　　处：《Photonics Research》2024年第8期1610-1618,共9页光子学研究（英文版）

基　　金：National Key Research and Development Program of China(2021YFA1400700);National Natural Science Foundation of China(62222515,12174438,11934019,91950118);Basic Frontier Science Research Program of Chinese Academy of Sciences(ZDBS-LYJSC003);CAS Project for Young Scientists in Basic Research(YSBR-100)。

摘　　要：Standing-wave supermode microresonators that are created through the strong coupling between counter-propagating modes have emerged as versatile platforms for sensing and nonlinear optics.For example,these microresonators have shown potential in nanoparticle sizing and counting,as well as enhancing the single-photon optomechanical coupling rate of stimulated Brillouin scattering.However,it has been observed that the relation between the mode linewidth and on-resonance transmission of the split supermodes differs obviously from that of the non-split modes.This behavior is typically quantified by the coupling ideality(I),which remains inadequately explored for the standing-wave supermodes.In this study,we theoretically and experimentally investigate the coupling ideality of standing-wave supermodes in a commonly employed configuration involving a Si O2microresonator side-coupled to a tapered fiber.Our findings demonstrate that,even with a single-mode tapered fiber,the coupling ideality of the standing-wave supermodes is limited to 0.5,due to the strong backscattering-induced energy loss into the counter-propagating direction,resulting in an additional equivalent parasitic loss.While achieving a coupling ideality of 0.5 presents challenges for reaching over-coupled regimes,it offers a convenient approach for adjusting the total linewidth of the modes while maintaining critically-coupled conditions.

关 键 词：IDEALITY MODE WAVE 

分 类 号：TN256[电子电信—物理电子学]