Coupling ideality of standing-wave supermode microresonators
作者机构：Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of Sciences University of Chinese Academy of Sciences State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronicsSchool of PhysicsPeking University School of PhysicsBeihang University Collaborative Innovation Center of Extreme OpticsShanxi University Songshan Lake Materials Laboratory
出 版 物：《Photonics Research》 (光子学研究)
年 卷 期：2024年第12卷第8期
页 面：1610-1618页
核心收录：
学科分类：070207[理学-光学] 07[理学] 0702[理学-物理学]
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)
主 题：Optical filters Rayleigh scattering Single mode fibers Stimulated Brillouin scattering Tapered fibers Waveguide modes
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.
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