Numerical and experimental investigations of dependence of photoacoustic signals from gold nanoparticles on the optical properties

  • Shinpei Okawa
  • Takeshi Hirasawa
  • Ryota Sato
  • Toshihiro Kushibiki
  • Miya Ishihara
  • Toshiharu Teranishi
Regular Paper
  • 34 Downloads

Abstract

Gold nanoparticles (AuNPs) are used as a contrast agent of the photoacoustic (PA) imaging. The efficiency of AuNPs has been discussed with the absorption cross section. However, the effects of the scattering of the light by AuNPs and surrounding medium on the PA signal from AuNPs have not been discussed. The PA signals from the aqueous solution of AuNPs were examined in the numerical simulation and the experiment. In the numerical simulation, the absorption and scattering cross sections of spherical and polyhedral AuNPs were calculated by Mie theory and discrete dipole approximation. Monte Carlo simulation calculated the absorbed light energy in the aqueous solution of AuNPs. Based on the PA wave equation, the PA signals were simulated. In the experiment, the PA signal from the aqueous solution of AuNP was measured by use of a piezoelectric film and a Q-switched Nd:YAG laser operated at 532 nm. The results of the numerical simulation and the experiment agreed well. In the numerical simulation and the experiment, a single Au nanocube with 50-nm edge generated the peak value of the PA signal significantly. It was approximately 350 times and twice as large as the peak values of the spherical AuNPs with 10- and 50-nm diameters, respectively. The peak value of the PA signal depended on both the absorption and scattering coefficients of the AuNPs and the surrounding medium. The peak value increased with the scattering coefficient in a quadratic manner. The character of the temporal profile of the PA signal such as full width at half maximum depended on the scattering coefficient of the AuNPs.

Keywords

Gold nanoparticle Optical property Monte Carlo method Discrete dipole approximation Photoacoustic 

Notes

Acknowledgements

This work was partly supported by AMED Collaborative Research Based on Industrial Demand (In vivo Molecular Imaging: Toward Biophotonics Innovations in Medicine), JSPS KAKENHI (Grant Number 15K06125), and the Collaborative Research Program of Institute for Chemical Research, Kyoto University (Grants #2015-42, 2016-44 and 2017-44).

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Copyright information

© The Optical Society of Japan 2018

Authors and Affiliations

  • Shinpei Okawa
    • 1
  • Takeshi Hirasawa
    • 1
  • Ryota Sato
    • 2
  • Toshihiro Kushibiki
    • 1
  • Miya Ishihara
    • 1
  • Toshiharu Teranishi
    • 2
  1. 1.Department of Medical EngineeringNational Defense Medical CollegeTokorozawaJapan
  2. 2.Institute for Chemical ResearchKyoto UniversityKyotoJapan

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