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Cavity optomagnonics has emerged as a promising platform for studyingcoherent photon-spin interactions as well as tunable microwave-to-opticalconversion. However, current implementation of cavity optomagnonics inferrimagnetic crystals remains orders of magnitude larger in volume thanstate-of-the-art cavity optomechanical devices, resulting in very limitedmagneto-optical interaction strength. Here, we demonstrate a cavityoptomagnonic device based on integrated waveguides and its application formicrowave-to-optical conversion. By designing a ferrimagnetic rib waveguide tosupport multiple magnon modes with maximal mode overlap to the optical field,we realize a high magneto-optical cooperativity which is three orders ofmagnitude higher compared to previous records obtained on polished YIG spheres.Furthermore, we achieve tunable conversion of microwave photons at around 8.45GHz 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 crossroadbetween quantum optics and magnonics.

Waveguide cavity optomagnonics for broadband multimode microwave-to-optics conversion