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Accepted: Dec. 30, 2019

Posted: Jan. 3, 2020

Published Online: Feb. 14, 2020

The Author Email: Bin Zhang (zhangbin5@mail.sysu.edu.cn), Zhaohui Li (lzhh88@mail.sysu.edu.cn)

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Jingshun Pan, Bin Zhang, Zhengyong Liu, Jiaxin Zhao, Yuanhua Feng, Lei Wan, Zhaohui Li. Microbubble resonators combined with a digital optical frequency comb for high-precision air-coupled ultrasound detectors[J]. Photonics Research, 2020, 8(3): 03000303

Fast and sensitive air-coupled ultrasound detection is essential for many applications such as radar, ultrasound imaging, and defect detection. Here we present a novel approach based on a digital optical frequency comb (DOFC) technique combined with high-$Q$ optical microbubble resonators (MBRs). DOFC enables precise spectroscopy on resonators that can trace the ultrasound pressure with its resonant frequency shift with femtometer resolution and sub-microsecond response time. The noise equivalent pressure of air-coupled ultrasound as low as $4.4 mPa/√Hz$ is achieved by combining a high-$Q$ ($～3×107$) MBR with the DOFC method. Moreover, it can observe multi-resonance peaks from multiple MBRs to directly monitor the precise spatial location of the ultrasonic source. This approach has a potential to be applied in 3D air-coupled photoacoustic and ultrasonic imaging.