Efficient acousto-optic modulation using a microring resonator on a thin-film lithium niobate–chalcogenide hybrid platform
Zhiqiang Yang, Meixun Wen, Lei Wan, Tianhua Feng, Wenfeng Zhou, Dong Liu, Siqing Zeng, Shuixian Yang, Zhaohui Li
Abstract
This Letter presents the first, to the best of our knowledge, thin-film lithium niobate–chalcogenide based microring acousto-optic modulator where an interdigital transducer and a chalcogenide strip waveguide are integrated on X-cut thin-film lithium niobate. The microring resonator exhibits a high loaded quality factor of 5 × 10 5 . The developed hybrid acousto-optic modulator with an interaction length of 120 µm demonstrates an effective half-wave voltage of only 1.74 V, which corresponds to a voltage-length product of 0.02 V•cm. The performance of the acousto-optic modulator demonstrated on the unsuspended thin-film lithium niobate–chalcogenide waveguide platform is on par with that obtained from an acoustic cavity assisted homogeneous lithium niobate counterpart.