Computational study of plasma-assisted photoacoustic response from gold nanoparticles irradiated by off-resonance ultrafast laser

  • Ali Hatef
  • Behafarid Darvish
  • Amir Yousef Sajjadi
Research Paper

DOI: 10.1007/s11051-017-3776-z

Cite this article as:
Hatef, A., Darvish, B. & Sajjadi, A.Y. J Nanopart Res (2017) 19: 67. doi:10.1007/s11051-017-3776-z
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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.

Keywords

Plasma dynamics Photoacoustic Plasmonics Gold nanoparticle Ultrashort pulsed laser Modeling and simulation 

Copyright information

© Springer Science+Business Media Dordrecht 2017

Authors and Affiliations

  1. 1.Nipissing Computational Physics Laboratory (NCPL), Department of Computer Science and MathematicsNipissing UniversityNorth BayCanada
  2. 2.Cutaneous Biology Research CenterMassachusetts General HospitalBostonUSA
  3. 3.Department of DermatologyHarvard Medical SchoolCharlestownUSA

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