Nonlinear optical characterization of copper oxide nanoellipsoids

Area of Science:

• Materials Science
• Nanotechnology
• Nonlinear Optics

Background:

• Nonspherical nanoparticles are gaining attention for their unique properties.
• Understanding nonlinear optical (NLO) properties is crucial for advanced optical applications.

Purpose of the Study:

• To investigate the nonlinear optical properties of copper oxide nanoellipsoids.
• To analyze the optical limiting effect and NLO response influenced by band gap.
• To study both low- and high-order NLO responses for the first time.

Main Methods:

• Utilized 800 nm and 400 nm, 60 fs laser pulses to probe copper oxide nanoellipsoids.
• Measured nonlinear optical parameters (γ and β) of the nanoellipsoid suspension.
• Analyzed high-order harmonic generation in laser-induced plasmas from nanoellipsoid targets.

Main Results:

• Measured nonlinear optical parameters: γ = 1.23 × 10⁻¹⁵ cm²/W and β = 1.0 × 10⁻¹¹ cm/W.
• Observed a four-fold enhancement in nonlinear optical refraction at 400 nm compared to 800 nm.
• Generated high-order harmonics up to the 35th order (50 eV) with single-color pump and 24th order (30 eV) with two-color pump.

Conclusions:

• Copper oxide nanoellipsoids demonstrate significant nonlinear optical responses.
• The study provides insights into the influence of band gap on NLO properties.
• Results highlight the potential of these nanoellipsoids for advanced optical limiting and harmonic generation applications.