Abstract
The gold nanoparticles (AuNPs) are capable of enhancing the incident laser field in the form of scattered near field for even an off-resonance irradiation where the incident laser wavelength is far away from the localized surface plasmon resonance (LSPR). If the intensity of the pulse laser is large enough, this capability can be employed to generate a highly localized free electron (plasma) in the vicinity of the particles. The generated plasma can absorb more energy during the pulse, and this energy deposition can be considered as an energy source for structural mechanics calculations in the surrounding media to generate a photoacoustic (PA) signal. To show this, in this paper, we model plasma-mediated PA pressure wave propagation from a 100-nm AuNPs and the surrounding media irradiated by an ultrashort pulse laser. In this model, the AuNP is immersed in water and the laser pulse width is ranging from 70 fs to 2 ps at the wavelength of 800 nm (off-resonance). Our results qualitatively show the substantial impact of the energy deposition in plasma on the PA signal through boosting the pressure amplitudes up to ∼1000 times compared to the conventional approach.
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Acknowledgements
The authors would like to thank Mr. Adrien Dagallier for the useful dissections and editing of the manuscript. The authors are also grateful to Prof. Michel Meunier, the director of Laser Processing and Plasmonics Laboratory at École Polytechnique de Montréal, for sharing their facilities including the computational servers and required software.
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This study was funded by the Natural Sciences and Engineering Research Council of Canada (NSERC) with award number RGPIN-2016-03826.
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Hatef, A., Darvish, B. & Sajjadi, A.Y. Computational study of plasma-assisted photoacoustic response from gold nanoparticles irradiated by off-resonance ultrafast laser. J Nanopart Res 19, 67 (2017). https://doi.org/10.1007/s11051-017-3776-z
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DOI: https://doi.org/10.1007/s11051-017-3776-z