Time-Resolved cw Thermal Z-scan for Nanoparticles Scattering Evaluation in Liquid Suspension

Area of Science:

• Optics and Photonics
• Materials Science
• Nanotechnology

Background:

• The thermal lens effect is a sensitive optical phenomenon used to study material properties.
• Accurate characterization of thermo-optical properties is crucial for various applications.
• Gold nanoparticles exhibit unique optical properties influenced by their size and environment.

Purpose of the Study:

• To analyze the thermal lens effect as a time-resolved Z-scan measurement.
• To evaluate measurement errors and linearity of the response.
• To determine thermo-optical characteristics of absorbing liquids and optical efficiencies of gold nanoparticles.

Main Methods:

• Utilized a continuous-wave (cw) single Gaussian beam configuration for Z-scan measurements.
• Employed statistical calculations to assess measurement errors and response linearity.
• Applied the method to gold nanoparticles of 5 and 50 nm diameters.

Main Results:

• Established the main characteristics of the time-resolved Z-scan measurement for thermal lens analysis.
• Successfully extracted thermo-optical properties of absorbing liquids.
• Demonstrated the feasibility of determining absorption and scattering efficiencies for gold nanoparticles.

Conclusions:

• The time-resolved Z-scan method is effective for characterizing thermo-optical properties.
• The technique provides a reliable way to measure optical efficiencies of nanoparticles.
• This approach offers a robust tool for materials characterization.