Fig. 1: Experimental schematic and alternate viewpoints.
From: Coupling the thermal acoustic modes of a bubble to an optomechanical sensor
A schematic sketch of a tethered bubble aligned overtop of a Fabry–Perot sensor. The mechanical element in our sensor is a curved, buckled mirror, and its displacement is read out using a laser. In a simplistic view (i), acoustic energy confined in the bubble is detected as an external force on the sensor. A more holistic view (ii) treats the bubble and sensor as coupled oscillators. An alternative point of view (iii) treats the sensor as an oscillating ‘dipole’ source and the bubble as a cavity which modifies the acoustic density of states in the vicinity of the sensor. Panel (iv) shows overhead and side views of the two lowest-order, radially symmetric modes of the sensor’s buckled mirror as predicted by a finite-element simulation (COMSOL)
