Acoustic whispering gallery mode coupling with Lamb waves in liquid

Acoustic whispering gallery modes (WGMs) in a micro-quartz tube immersed in liquid medium, excited by the evanescent wave of a Lamb wave device, are demonstrated. These excited WGMs exhibit characteristics similar to those of optical WGMs, such as narrow periodic transmission dips and a high quality factor. These results show the possibility to build acoustic sensors, filter and acoustic resonators working in liquid with improved performance.