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Related Experiment Video

Updated: Jun 11, 2026

Evanescent Field Based Photoacoustics: Optical Property Evaluation at Surfaces

Evanescent Field Based Photoacoustics: Optical Property Evaluation at Surfaces

Published on: July 26, 2016

Nonlinear photoacoustics for measuring the nonlinear optical absorption coefficient.

Chandra S Yelleswarapu¹, Sri-Rajasekhar Kothapalli

¹Department of Physics, University of Massachusetts Boston, 100 Morrissey Blvd, Boston, MA 02125, USA. Chandra.yelleswarapu@umb.edu

|July 1, 2010

Summary

A new photoacoustic Z-scan (PAZ-scan) technique measures nonlinear optical absorption. This method, demonstrated using mouse blood, shows potential for calibrating contrast agents in theranostics and photoacoustics.

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Last Updated: Jun 11, 2026

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Area of Science:

Optics and Photonics
Biomedical Imaging
Materials Science

Background:

Conventional Z-scan techniques are widely used for characterizing nonlinear optical properties.
Photoacoustic detection offers high sensitivity for detecting light absorption.
There is a need for precise calibration of contrast agents in theranostics and photoacoustic imaging.

Purpose of the Study:

To introduce and validate a novel photoacoustic Z-scan (PAZ-scan) technique.
To demonstrate the capability of PAZ-scan for measuring nonlinear optical absorption.
To explore the potential of PAZ-scan for calibrating contrast agents.

Main Methods:

The PAZ-scan technique involves scanning a sample through a focused laser beam.
Photoacoustic signals are generated and detected using a focused ultrasound transducer.
Signal strength is correlated with optical absorption to analyze nonlinear behavior.

Main Results:

The PAZ-scan technique successfully detected nonlinear optical absorption in materials.
Experiments using mouse blood demonstrated the technique's efficacy.
The signal strength was found to be directly proportional to optical absorption.

Conclusions:

PAZ-scan effectively combines Z-scan advantages with photoacoustic sensitivity.
The technique can accurately depict nonlinear optical absorption.
PAZ-scan shows promise as a standard method for calibrating contrast agents in theranostics and photoacoustics.