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Opto-mechano-fluidic resonators (OMFRs) are a new platform forhigh-throughput sensing of the mechanical properties of freely flowingmicroparticles in arbitrary media. Experimental extraction of OMFR mode shapes,especially the acoustic pressure field within the fluidic core, is essentialfor determining sensitivity and for extracting the particle parameters. Here wedemonstrate a new imaging technique for simultaneously capturing the spatiallydistributed acoustic pressure fields of multiple vibrational modes in the OMFRsystem. The mechanism operates using microparticles as perturbative imagingprobes, and potentially reveals the inverse path towards multimode inertialdetection of the particles themselves.

Imaging of acoustic pressure modes in opto-mechano-fluidic resonators with a single particle probe