High-Order Harmonic Generation in Au Nanoparticle-Contained Plasmas

Abstract

Gold nanoparticles (NPs) have a wide range of applications in various fields. Here, we present high-order nonlinear optical studies of the plasmas produced from ablation of Au bulk targets and Au NP films deposited on paper and glass substrates. Experimentally, we analyze high-order harmonic generation (HHG) from gold NPs-containing plasmas. The HHG is produced by 35-fs pulses at 800 and 400 nm, while the plasmas are produced by femtosecond (35 fs, 800 nm), picosecond (200 ps, 800 nm), and nanosecond (5 ns, 1064 nm) pulses, respectively. High-order harmonics produced from ablated Au NPs on paper were 40 times stronger than the HHG from that ablated from the Au bulk targets. Through molecular dynamic simulations, we investigate the formation of gold NPs during laser ablation of a metal surface under different conditions.

High-Order Harmonics Generation in MoS2 Transition Metal Dichalcogenides: Effect of Nickel and Carbon Nanotube Dopants

“…Thus, those results demonstrated that MoS 2 NFs are the major constituents in MoS 2 -Ni, and MoS 2 -NiCNT samples whereas nickel NPs and carbon nanotubes influence the electronic, optical, and catalytic properties of MoS 2 NFs. We used nickel NPs and CNT composites as the dopants of MoS 2 material because of their ability to enhance the nonlinear optical properties and recombination cross-section of delocalized π -electron cloud, which results in the enhanced harmonic generation [ 28 , 30 , 31 , 36 ].…”

“…Hence, to increase the yield and cut-off energy of harmonics, different schemes like resonance-induced enhancement, quasi-phase matching of harmonics, application of multi-particle species, optimization of laser parameters, use of polarization structured beams, multicolor excitation, etc. have been introduced [ 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 ].…”

Green route synthesis of alpinia calcarata functionalized gold nanoparticles for nonlinear optical applications

“…Morphology dependant non-linear optical properties have been reported for Au NPs [ 26 , 27 , 28 ]. Recently, high-order harmonic generation in Au NPs has been studied [ 29 ]. Gold NPs conjugated with methylene blue showed improved third order non-linear properties [ 30 ].…”