Ms. Chunqi Zheng Profile

Chunqi Zheng

at Zhejiang Univ

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Proceedings Article | 17 May 2019 Paper

Photoacoustic properties of metal-insulator-metal nanostructures

Chunqi Zheng, Huanzheng Zhu, Jingyi Tian, Qiang Li

Proceedings Volume 11170, 111703T (2019) https://doi.org/10.1117/12.2534004

KEYWORDS: Nanostructures, Gold, Acoustics, Absorption, Photoacoustic spectroscopy, Metals, Tissues, Mechanics, Wave propagation, Image resolution

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By combining the advantages of high resolution in optical imaging and deep penetration depth in ultrasound imaging, photoacoustic(PA) imaging enables high resolution deep imaging in vivo. A nanoprobe with high conversion efficiency is usually used in order to increase the amplitude of the photoacoustic signal. Here, highly efficient PA conversion is demonstrated in metal-insulator-metal(MIM) nanostructures. A magnetic resonance can be formed to achieve nearly 100% absorption of incident light near the resonant wavelength. In this paper, the absorbance of the MIM structure in the visible and near-infrared wavelength is demonstrated at first. Then, multiphysics coupling approach is used to solve the electromagnetic, thermodynamic and transient acoustic pressure physics. The results show that the photoacoustic signal amplitude of the MIM structures is much higher than that of the same structures without the top metal strips. Due to its high PA conversion efficiency, the MIM nanostructures can generate strong PA signals with low laser incident power, resulting in better biocompatibility. In this way, it can be applied not only as a PA probe to biomedical PA imaging, photoacoustic tomography, but also to medical related fields such as photothermotherapy and precision drug delivery.

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