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Updated: Mar 18, 2026

Evanescent Field Based Photoacoustics: Optical Property Evaluation at Surfaces

Evanescent Field Based Photoacoustics: Optical Property Evaluation at Surfaces

Published on: July 26, 2016

Acoustic biosensors.

Ronen Fogel¹, Janice Limson², Ashwin A Seshia³

¹Biotechnology Innovation Centre, Rhodes University, PO Box 94, Grahamstown 6140, South Africa.

Essays in Biochemistry

|July 2, 2016

Summary

This summary is machine-generated.

Acoustic wave devices offer sensitive gravimetric sensing for biological and chemical analytes. Miniaturization and integration with microfluidics enhance performance, scalability, and cost-effectiveness for diverse applications.

Keywords:

acoustic biosensors bulk acoustic waves microelectromechanical system (MEMS)piezoelectricity quartz crystal microbalance surface acoustic waves

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Area of Science:

Materials Science
Chemical Engineering
Sensor Technology

Background:

Resonant and acoustic wave devices have been explored for decades for gravimetric sensing.
These sensors detect analytes by correlating physical property modulations (e.g., frequency, velocity) with analyte adsorption.

Purpose of the Study:

To review resonant and acoustic wave sensor devices for gravimetric sensing applications.
To highlight the advantages of miniaturization, integration with microfluidics, and semiconductor manufacturing compatibility.

Main Methods:

Review of three main device types: bulk acoustic wave sensors, surface acoustic wave sensors, and micro/nano-electromechanical system (MEMS/NEMS) sensors.
Discussion of principles of operation, including measurand coupling and signal transduction.

Main Results:

Miniaturized devices offer advantages in cost, size, scalability, sensitivity, and multiplexing capabilities.
Integration with microfluidics improves sample handling, selectivity, and signal-to-noise ratio.
Fabrication compatibility with semiconductor manufacturing ensures precision and reproducibility.

Conclusions:

Acoustic wave sensors are versatile tools for gravimetric sensing of chemical and biological analytes.
The reviewed devices (BAW, SAW, MEMS/NEMS) show significant potential for advanced sensing platforms.
Further integration and optimization can lead to enhanced performance and broader applications.