Nonlinear photoacoustics for measuring the nonlinear optical absorption coefficient

Chandra S. Yelleswarapu, Sri Rajasekhar Kothapalli

Research output: Contribution to journalArticlepeer-review

40 Scopus citations


We report a novel photoacoustic Z-scan (PAZ-scan) technique that combines the advantages offered by the conventional Z-scan method and the sensitivity of the photoacoustic detection. The sample is scanned through the focused laser beam and the generated photoacoustic signal is recorded using a 10 MHz focused ultrasound transducer. Since the signal strength is directly proportional to the optical absorption, PAZ-scan displays nonlinear behavior depicting the nonlinear optical absorption of the material. Among many advantages, our experiments on mouse blood show that PAZ-scan can potentially be used as a standard technique to calibrate contrast agents used in theranostics in general and photoacoustics in particular.

Original languageEnglish (US)
Pages (from-to)9020-9025
Number of pages6
JournalOptics Express
Issue number9
StatePublished - Apr 26 2010

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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