Effect of the optical properties of gold nanoparticles on photoacoustic signals
Effect of the optical properties of gold nanoparticles on photoacoustic signals
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金纳米粒子的光学特性对光声信号的影响
DOI：
10.1117/12.2213879
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Toshiharu Teranishi
中科院分区：
文献类型：
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作者：
Shinpei Okawa;Takeshi Hirasawa;Ryota Sato;Toshihiro Kushibiki;Miya Ishihara;Toshiharu Teranishi
采用不同的球形和多面体纳米金颗粒，通过数值模拟和实验研究了纳米金颗粒的光学性质对光声信号的影响。在数值模拟中，采用离散偶极近似计算了吸收截面和散射截面。利用蒙特卡罗方法计算了吸收光能。然后根据PA波动方程对PA压力波进行了模拟。在实验中，使用P（VDFTrFE）压电薄膜和532 nm的调q Nd:YAG激光器测量了AuNP悬浮液的PA信号。结果表明，扩声信号的吸收截面和散射截面都具有明显的特征。含有AuNPs的散射介质增强了PA信号的振幅。
The effects of the optical properties of gold nanoparticle (AuNP) on the photoacoustic (PA) signals were investigated with the numerical simulation and experiment using various spherical and polyhedral AuNPs. In the numerical simulation, the absorption and scattering cross sections were calculated by the discrete dipole approximation. The absorbed light energy was calculated by the Monte Carlo method. Then PA pressure wave was simulated based on the PA wave equation. In the experiment, the PA signals from the AuNP suspensions were measured by use of a P(VDFTrFE) piezoelectric film and a Q-switched Nd:YAG laser operated at 532 nm. It was demonstrated that the PA signals were characterized by both of the absorption cross sections and the scattering cross section. The scattering medium containing the AuNPs enhanced the amplitude of the PA signals.