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.
Highlights
Since the prediction from the theoretical work of Braginsky [1,2] that the mechanical vibrational oscillation and the optical mode in a Fabry-Pérot resonator can be coupled together, optomechanics has been investigated widely [3,4,5,6,7,8,9]
It was found that when the displacement is large enough, it can change the mechanical rigidity of material, varying the mechanical vibration frequency, named the optical spring effect (OSE) [13,14]
Few works of cavity optomechanics have been done in non-solid phases of matter
Summary
Since the prediction from the theoretical work of Braginsky [1,2] that the mechanical vibrational oscillation and the optical mode in a Fabry-Pérot resonator can be coupled together, optomechanics has been investigated widely [3,4,5,6,7,8,9]. It was found that when the displacement is large enough, it can change the mechanical rigidity of material, varying the mechanical vibration frequency, named the optical spring effect (OSE) [13,14]. This effect has been first reported in Fabry-Pérot resonators [15,16], an increasing number of works are focused on or related to this phenomenon in the solid photonic devices, such as photonic crystal cavities [5,6,11,17]. We found that when a MBR is filled with a kind of liquid, both OSE and effective mass have extraordinary behaviors
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