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High-Order Harmonic Generation in Au Nanoparticle-Contained Plasmas.

Mottamchetty Venkatesh1, Rashid A Ganeev1,2,3, Dmitry S Ivanov4,5,6,7

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Gold nanoparticles (NPs) enhanced high-order harmonic generation (HHG) from laser-ablated plasmas by 40 times compared to bulk gold. Molecular dynamics simulations explored NP formation during laser ablation.

Keywords:
high-order harmonicslaser plasmalaser-matter interactionsmolecular dynamicsnanoparticlessimulationultrashort pulses

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Area of Science:

  • Nonlinear Optics
  • Materials Science
  • Plasma Physics

Background:

  • Gold nanoparticles (NPs) exhibit diverse applications.
  • Laser-induced plasma generation is crucial for material processing and analysis.
  • High-order harmonic generation (HHG) is a sensitive probe of plasma properties.

Purpose of the Study:

  • Investigate high-order nonlinear optical properties of laser-ablated gold NP plasmas.
  • Compare HHG efficiency from gold NP films versus bulk gold targets.
  • Understand gold NP formation mechanisms during laser ablation via simulations.

Main Methods:

  • Laser ablation of gold bulk targets and gold NP films on paper/glass substrates.
  • Experimental analysis of high-order harmonic generation (HHG) using femtosecond laser pulses.
  • Molecular dynamics simulations to model gold NP formation under laser ablation.

Main Results:

  • Observed significant enhancement in HHG from gold NP-containing plasmas.
  • Achieved a 40-fold increase in HHG from ablated gold NPs on paper compared to bulk gold.
  • Simulations provided insights into NP formation dynamics during laser-induced ablation.

Conclusions:

  • Gold nanoparticles significantly boost nonlinear optical responses in laser-produced plasmas.
  • The substrate (paper) plays a role in enhancing HHG efficiency from ablated gold NPs.
  • Laser ablation combined with simulations offers a pathway to tailor NP properties for advanced applications.