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Proceedings Paper

Towards biochemical sensing with gold nanoparticles through suppression of nonlinear photoacoustic signal generation
Author(s): Genny A. Pang; Li Qiu; Christoph Haisch; Jan Laufer
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Paper Abstract

We propose a new method for biochemical sensing using photoacoustic (PA) excitation of gold nanoparticles (GNPs) to achieve real-time detection of transient biomarkers. Our approach is based on the effect of a particle coating on nonlinear PA signal generation combined with our recently-developed serial PA tomographic imaging method. We have shown the ability to image the three-dimensional spatial distribution of GNPs that produce nonlinear PA signal with respect to fluence. If the occurrence of this nonlinearity is made dependent on the presence of transient biochemical markers, for example through the degradation of a nonlinearity-quenching particle coating, our serial PA tomographic imaging method can be extended for real-time three-dimensional in situ imaging of these biomarkers. Our early-stage proof-ofconcept experimental results presented here show that coating GNPs that exhibit nonlinear PA signal generation behavior is an effective method to remove the nonlinear effect. The coefficient of determination (R2 ) of a linear fit to the PA signal as a function of fluence can be effectively used to differentiate the coated GNPs and the GNPs without coating. This differentiation can also be achieved using the second order coefficient to a quadratic fit to the PA signal vs. fluence data.

Paper Details

Date Published: 27 February 2019
PDF: 6 pages
Proc. SPIE 10878, Photons Plus Ultrasound: Imaging and Sensing 2019, 108786Q (27 February 2019); doi: 10.1117/12.2523417
Show Author Affiliations
Genny A. Pang, Technische Univ. München (Germany)
Li Qiu, Technische Univ. München (Germany)
Christoph Haisch, Technische Univ. München (Germany)
Jan Laufer, Martin-Luther-Univ. Halle-Wittenberg (Germany)

Published in SPIE Proceedings Vol. 10878:
Photons Plus Ultrasound: Imaging and Sensing 2019
Alexander A. Oraevsky; Lihong V. Wang, Editor(s)

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