Optical Spring Effect in Micro-Bubble Resonators and Its Application for the Effective Mass Measurement of Optomechanical Resonant Mode

Zhenmin Chen; Xiang Wu; Liying Liu; Lei Xu

doi:10.3390/s17102256

Optical Spring Effect in Micro-Bubble Resonators and Its Application for the Effective Mass Measurement of Optomechanical Resonant Mode

Sensors (Basel). 2017 Sep 30;17(10):2256. doi: 10.3390/s17102256.

Authors

Zhenmin Chen¹, Xiang Wu², Liying Liu³, Lei Xu^{4

5}

Affiliations

¹ Key Lab for Micro and Nanophotonic Structures (Ministry of Education), Department of Optical Science and Engineering, School of Information Science and Engineering, Fudan University, Shanghai 200433, China. 12110720020@fudan.edu.cn.
² Key Lab for Micro and Nanophotonic Structures (Ministry of Education), Department of Optical Science and Engineering, School of Information Science and Engineering, Fudan University, Shanghai 200433, China. wuxiang@fudan.edu.cn.
³ Key Lab for Micro and Nanophotonic Structures (Ministry of Education), Department of Optical Science and Engineering, School of Information Science and Engineering, Fudan University, Shanghai 200433, China. lyliu@fudan.edu.cn.
⁴ Key Lab for Micro and Nanophotonic Structures (Ministry of Education), Department of Optical Science and Engineering, School of Information Science and Engineering, Fudan University, Shanghai 200433, China. leixu@fudan.ac.cn.
⁵ Department of Physics, Fudan University, Shanghai 200433, China. leixu@fudan.ac.cn.

Abstract

In this work, we present a novel approach for obtaining the effective mass of mechanical vibration mode in micro-bubble resonators (MBRs). To be specific, the effective mass is deduced from the measurement of optical spring effect (OSE) in MBRs. This approach is demonstrated and applied to analyze the effective mass of hollow MBRs and liquid-filled MBRs, respectively. It is found that the liquid-filled MBRs has significantly stronger OSE and a less effective mass than hollow MBRs, both of the extraordinary behaviors can be beneficial for applications such as mass sensing. Larger OSE from higher order harmonics of the mechanical modes is also observed. Our work paves a way towards the developing of OSE-based high sensitive mass sensor in MBRs.

Keywords: micro-bubble resonators; optical sensing and sensors; optical spring effect; optomechanics; whispering-gallery mode (WGM) microcavity.