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

TL;DR

This paper introduces a novel imaging technique that uses microparticles as probes to visualize acoustic pressure fields in opto-mechano-fluidic resonators, advancing high-throughput particle sensing capabilities.

Contribution

The study presents a new method for imaging acoustic pressure modes in OMFRs using particles as perturbative probes, enabling detailed mode shape analysis.

Findings

Successful imaging of multiple vibrational modes

Potential for multimode inertial particle detection

Enhanced understanding of mode shapes in OMFRs

Abstract

Opto-mechano-fluidic resonators (OMFRs) are a new platform for high-throughput sensing of the mechanical properties of freely flowing microparticles in arbitrary media. Experimental extraction of OMFR mode shapes, especially the acoustic pressure field within the fluidic core, is essential for determining sensitivity and for extracting the particle parameters. Here we demonstrate a new imaging technique for simultaneously capturing the spatially distributed acoustic pressure fields of multiple vibrational modes in the OMFR system. The mechanism operates using microparticles as perturbative imaging probes, and potentially reveals the inverse path towards multimode inertial detection of the particles themselves.