Ultrasonic spectroscopy of sessile droplets coupled to optomechanical sensors

Scheuer, K. G.; Romero, F. B.; Hornig, G. J.; DeCorby, R. G.

doi:10.1039/d3lc00609c

Lab Chip

2023

DOI: 10.1039/d3lc00609c

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Ultrasonic spectroscopy of sessile droplets coupled to optomechanical sensors

K. G. Scheuer,

F. B. Romero,

G. J. Hornig

et al.

Abstract: We describe the passive sensing of high-frequency vibrational modes of sessile droplets using integrated optomechanical sensors. This approach has potential to enable acoustic spectroscopy of liquid samples in an open microfluidics platform.

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2024

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Cited by 2 publications

References 35 publications

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Air-coupled ultrasound using broadband shock waves from piezoelectric spark igniters

Scheuer,

DeCorby

2024

Applied Physics Letters

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We used an optomechanical sensor to study the ultrasound generated by manually operated piezoelectric spark igniters. These low-energy sparks produce short-duration acoustic shock-wave pulses, with sub-microsecond rise times and frequency content extending well beyond 2 MHz in air. The same source–receiver combination was then used to demonstrate broadband characterization of solid (polymer and glass) plates in a simple setup, where single spark events yielded high signal-to-noise ratio data without the need for critical alignment. This setup also enabled us to estimate pressure excursions approaching 105 Pa at millimeter-scale distances from the spark. The results are in large part made possible by the small size, wide bandwidth, and high sensitivity of the optomechanical sensor and might be of interest for air-coupled ultrasound applications in nondestructive testing.

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Air-coupled ultrasound using broadband shock waves from piezoelectric spark igniters

Scheuer,

DeCorby

2024

Applied Physics Letters

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Spectroscopy of substrate thermal vibrational modes using an optomechanical sensor

Scheuer,

Romero,

DeCorby

2024

Opt. Mater. Express

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We used an optomechanical sensor to record the vibrational spectrum of its own fused silica substrate. The coupling of the substrate modes was greatly enhanced by covering the sensor with an appropriately sized ethylene glycol droplet, and in that case even thermally populated modes could be clearly detected. We observed a rich spectrum of high-quality flexural modes for frequencies less than ∼ 10 MHz, in good agreement with analytical theory and finite element simulations. We also observed signatures of acoustic waves resonantly confined by the droplet, over the entire ∼ 0–40 MHz range of the experiment. This work could inform efforts to increase the quality factor of mechanical resonators, and the use of substrate phonon modes as information channels.

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Ultrasonic spectroscopy of sessile droplets coupled to optomechanical sensors

Abstract: We describe the passive sensing of high-frequency vibrational modes of sessile droplets using integrated optomechanical sensors. This approach has potential to enable acoustic spectroscopy of liquid samples in an open microfluidics platform.

Cited by 2 publications

References 35 publications

Air-coupled ultrasound using broadband shock waves from piezoelectric spark igniters

Air-coupled ultrasound using broadband shock waves from piezoelectric spark igniters

Spectroscopy of substrate thermal vibrational modes using an optomechanical sensor

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