Photonics Research, 2020, 8 (3): 03000303, Published Online: Feb. 14, 2020  

Microbubble resonators combined with a digital optical frequency comb for high-precision air-coupled ultrasound detectors Download: 732次

Author Affiliations
1 Key Laboratory of Optoelectronic Materials and Technologies, School of Electrical and Information Technology, Sun Yat-sen University, Guangzhou 510275, China
2 Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519000, China
3 Department of Electronic Engineering, College of Information Science and Technology, Jinan University, Guangzhou 510632, China
4 e-mail: zhangbin5@mail.sysu.edu.cn
5 e-mail: lzhh88@mail.sysu.edu.cn
Abstract
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.

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.

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