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This report introduces a novel optofluidic platform based on piezo-MEMStechnology, capable of identifying subtle variations in the fluidconcentration. The system utilizes piezoelectric micromachined ultrasoundtransducers (PMUTs) as receivers to capture sound waves produced by nanosecondphotoacoustic (PA) pulses emanating from a fluid target housed in PDMSmicrochannels. Additionally, a dedicated low-noise single-channel amplifier hasbeen developed to extract the minute analog voltage signals from the PMUTs,given the inherently weak ultrasound signals generated by fluid targets. ThePMUTs' proficiency in detecting changes in fluid concentration under bothstatic and time-varying conditions has been documented and verified, confirmingthe platform's efficacy in monitoring fluid concentrations.

PMUT-Powered Photoacoustic Detection: Revolutionizing Microfluidic Concentration Measurements