Coupling the thermal acoustic modes of a bubble to an optomechanical sensor  

作　　者：K.G.Scheuer F.B.Romero R.G.DeCorby 

机构地区：[1]Ultracoustics Technologies Ltd,Sherwood Park T8A 3H5 AB,Canada [2]ECE Department,University of Alberta,9211-116 St.NW,Edmonton T6G 1H9 AB,Canada

出　　处：《Microsystems & Nanoengineering》2024年第6期301-309,共9页微系统与纳米工程(英文)

基　　金：funded by the Government of Alberta(Innovation Catalyst Grant),Alberta Innovates,the Natural Sciences and Engineering Research Council of Canada(CREATE 495446-17);the Alberta EDT Major Innovation Fund(Quantum Technologies).

摘　　要：Optomechanical sensors provide a platform for probing acoustic/vibrational properties at the micro-scale.Here,we used cavity optomechanical sensors to interrogate the acoustic environment of adjacent air bubbles in water.We report experimental observations of the volume acoustic modes of these bubbles,including both the fundamental Minnaert breathing mode and a family of higher-order modes extending into the megahertz frequency range.Bubbles were placed on or near optomechanical sensors having a noise floor substantially determined by ambient medium fluctuations,and which are thus able to detect thermal motions of proximate objects.Bubble motions could be coupled to the sensor through both air(i.e.,with the sensor inside the bubble)and water,verifying that sound is radiated by the high-order modes.We also present evidence for elastic-Purcell-effect modifications of the sensor’s vibrational spectrum when encapsulated by a bubble,in the form of cavity-modified linewidths and line shifts.Our results could increase the understanding of bubble acoustics relevant to a variety of fields such as lab-on-a-chip microfluidics and biosensing,and could also inform future efforts to optimize the properties of micro-mechanical oscillators.

关 键 词：BUBBLE CAVITY THERMAL 

分 类 号：TP2[自动化与计算机技术—检测技术与自动化装置]