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arXiv · 2405.06274

Hybrid thin-film lithium niobate micro-ring acousto-optic modulator for microwave-to-optical conversion

Lei Wan·Jiying Huang·Meixun Wen·Huan Li·Wenfeng Zhou·Zhiqiang Yang·Yuping Chen·Huilong Liu·Siqing Zeng·Dong Liu·Shuixian Yang·Daoxin Dai·Zhaohui Li
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Abstract

Highly efficient acousto-optic modulation plays a vital role in the microwave-to-optical conversion. Herein, we demonstrate a hybrid thin-film lithium niobate (TFLN) racetrack micro-ring acousto-optic modulator (AOM) implemented with low-loss chalcogenide (ChG) waveguide. By engineering the electrode configuration of the interdigital transducer, the double-arm micro-ring acousto-optic modulation is experimentally confirmed in nonsuspended ChG loaded TFLN waveguide platform. Varying the position of blue-detuned bias point, the half-wave-voltage-length product VpaiL of the hybrid TFLN micro-ring AOM is as small as 9 mVcm. Accordingly, the acousto-optic coupling strength is estimated to be 0.48 Hz s1/2 at acoustic frequency of 0.84 GHz. By analyzing the generation of phonon number from the piezoelectric transducer, the microwave-to-optical conversion efficiency is calculated to be 0.05%, approximately one order of magnitude larger than that of the state-of-the-art suspended counterpart. Efficient microwave-to-optical conversion thus provides new opportunities for low-power-consumption quantum information transduction using the TFLN-ChG hybrid piezo-optomechanical devices.

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Lei Wan, Jiying Huang, Meixun Wen, Huan Li, Wenfeng Zhou, Zhiqiang Yang, Yuping Chen, Huilong Liu, Siqing Zeng, Dong Liu, Shuixian Yang, Daoxin Dai, Zhaohui Li. 2024-05-10. Hybrid thin-film lithium niobate micro-ring acousto-optic modulator for microwave-to-optical conversion. https://arxiv.org/abs/2405.06274

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