Abstract
Recently, nonspherical nanoparticles took attention due to advanced properties of these structures. We report the study of the nonlinear optical properties of copper oxide nanoellipsoids using 800 nm and 400 nm, 60 fs pulses. The optical limiting effect of copper oxide nanoellipsoids is analyzed. The influence of band gap of copper nanoparticles and copper oxide nanoellipsoids on their nonlinear optical response was studied. For the first time, the low- and high-order nonlinear optical responses of copper nanoellipsoids were studied. The magnitudes of nonlinear optical parameters of the suspension of copper oxide nanoellipsoids were measured to be γ = 1.23 × 10−15 cm2 W−1, and β = 1.0 × 10−11 cm W−1 respectively. We observed the four-fold enhancement of the nonlinear optical refraction of copper oxide nanoellipsoids at the wavelength of 400 nm, 60 fs probe pulses compared to 800 nm radiation. We also analyzed the high-order nonlinear response of CuO nanoellipsoids through generation of high-order harmonics of 800 nm, 60 fs pulses in the plasmas produced during laser ablation of the nanoellipsoid-contained targets. We demonstrated the harmonics up to the 35th order (E = 50 eV) in case of single-color pump and 24th (30 eV) in case of two-color pump.
Highlights
Nonspherical nanoparticles took attention due to advanced properties of these structures
We study the synthesis of Cu NPs and self-aggregated CuO NEs produced during laser ablation
In the case of Cu NPs the broad surface plasmon resonance (SPR) peaks was observed at 620 nm that was attributed to the presence of spherical nanoparticles (Fig. 1(a)), similarity to the results of ref.[16]
Summary
Nonspherical nanoparticles took attention due to advanced properties of these structures. It was shown that the increase of ablation time of copper in suspension of virgin coconut oil led to the decrease of the sizes of NPs. The investigation of the nonlinear optical properties of metal oxides, such as Co3O4, V2O5, CuO, Fe2O3, Mn3O4, Cr2O3 have shown larger nonlinear responses compared to non-oxidized nanostructures[8,9]. The studies of laser-produced plasmas (LPP) created on the surfaces of solid copper target using femtosecond and picosecond laser pulses for generation of low- and high-order harmonics was reported in refs[12,13,14,15]. The decrease of conversion efficiency of high harmonic generation (HHG) generally was caused by some components (e.g. free electrons, quantum dots or aggregated nanoparticles and microparticles) of plasma plumes evaporated during laser ablation using ultrashort laser pulses This behavior was caused due to the nature of these particles, which reached the interaction area with probe femtosecond www.nature.com/scientificreports/. In our studies we took the attention for analysis of the high-order nonlinear response of CuO nanoellipsoids (NEs) via generation of high-order harmonics
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