Plasmonic nanoparticles, such as Au nanoparticles, have been used as effective exogeneous contrast agents in photoacoustic imaging. However, using these particles to enhance photoacoustic wave generation from other light absorbers is difficult because the signal is overwhelmed by the signal from plasmonic nanoparticles themselves. In this study, we realized the surface-enhanced photoacoustic effect by using high-refractive-index dielectric nanoparticles in their ultralow light absorption Ohmic-loss wavelength band. We performed finite element method simulation on a model with gallium phosphide nanorod dimmer and light absorbers in the dimmer gap. The Au nanowire, carbon nanotube, and nanotube filled with melanin molecules were sequentially considered as the light absorber. It is found that a photoacoustic wave surface enhancement factor of approximately 10 was achieved and the enhanced photoacoustic wave ensures the photoacoustic spectral signature of the light absorber. The potential of optimization for boosting enhancement factors was further analyzed. These results can provide considerable insight into molecular photoacoustic sensing and imaging.
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21 November 2022
Research Article|
November 21 2022
Surface-enhanced photoacoustic wave generation from light absorbers located in the gap of high-refractive-index dielectric nanoparticles
Special Collection:
Thermal Radiation at the Nanoscale and Applications
Ying Zhang;
Ying Zhang
(Data curation, Formal analysis, Investigation, Resources, Software, Visualization, Writing – original draft, Writing – review & editing)
Nanophotonics Research Center, Shenzhen Key Laboratory of Micro-Scale Optical Information Technology, Institute of Microscale Optoelectronics, Shenzhen University
, Shenzhen 518060 China
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Hui Fang
Hui Fang
a)
(Conceptualization, Funding acquisition, Methodology, Project administration, Supervision, Visualization, Writing – review & editing)
Nanophotonics Research Center, Shenzhen Key Laboratory of Micro-Scale Optical Information Technology, Institute of Microscale Optoelectronics, Shenzhen University
, Shenzhen 518060 China
a)Author to whom correspondence should be addressed: fhui79@szu.edu.cn
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a)Author to whom correspondence should be addressed: fhui79@szu.edu.cn
Note: This paper is part of the APL Special Collection on Thermal Radiation at the Nanoscale and Applications.
Appl. Phys. Lett. 121, 213701 (2022)
Article history
Received:
August 23 2022
Accepted:
November 07 2022
Citation
Ying Zhang, Hui Fang; Surface-enhanced photoacoustic wave generation from light absorbers located in the gap of high-refractive-index dielectric nanoparticles. Appl. Phys. Lett. 21 November 2022; 121 (21): 213701. https://doi.org/10.1063/5.0122226
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