Zhu, NNZhuZhang, XFXFZhangHan, XXHanZou, CLCLZouZhong, CCCCZhongCHIAO-HSUAN WANGJiang, LLJiangTang, HXHXTang2022-12-162022-12-1620202334-2536https://scholars.lib.ntu.edu.tw/handle/123456789/626564Cavity optomagnonics has emerged as a promising platform for studying coherent photon-spin interactions as well as tunable microwave-to-optical conversion. However, current implementation of cavity optomagnonics in ferrimagnetic crystals remains orders of magnitude larger in volume than state-of-the-art cavity optomechanical devices, resulting in very limited magneto-optical interaction strength. Here, we demonstrate a cavity optomagnonic device based on integrated waveguides and its application for microwave-to-optical conversion. By designing a ferrimagnetic rib waveguide to support multiple magnon modes with maximal mode overlap to the optical field, we realize a high magneto-optical cooperativity, which is three orders of magnitude higher compared to previous records of the magneto-optical cooperativity obtained on polished yttrium iron garnet spheres. Furthermore, we achieve tunable conversion of microwave photons at around 8.45 GHz to 1550 nm light with a broad conversion bandwidth as large as 16.1 MHz. The unique features of the system point to novel applications at the crossroad between quantum optics and magnonics.SPIN-WAVES; QUANTUM[SDGs]SDG7journal article10.1364/OPTICA.3979672-s2.0-85092320127WOS:000581027000009https://api.elsevier.com/content/abstract/scopus_id/85092320127