Numerical Simulation of Light to Heat Conversion by Plasmonic Nanoheaters

Area of Science:

• Nanotechnology
• Materials Science
• Optics

Background:

• Plasmonic nanoparticles function as photothermal agents, converting light into heat.
• Accurate measurement of photothermal conversion efficiency (η) is vital for practical applications.
• Existing methods for η estimation vary significantly with experimental setup and calculation approach.

Purpose of the Study:

• To quantitatively evaluate and compare common experimental methods (Roper's, Wang's) for determining plasmonic nanoparticle photothermal conversion efficiency (η).
• To compare experimental η values with numerical simulations using ANSYS software.
• To assess the robustness of ANSYS simulations for estimating η, especially under experimental constraints.

Main Methods:

• Experiments involved colloidal gold nanorod solutions in hanging droplets irradiated by an 808 nm diode laser.
• Photothermal conversion efficiency (η) was measured using thermal imaging.
• Numerical simulations were performed using ANSYS software, incorporating heating and evaporation effects.

Main Results:

• ANSYS simulations yielded η values consistent with the Wang experimental method.
• The Roper experimental method produced lower η values compared to ANSYS simulations and the Wang method.
• Numerical simulations using ANSYS provided results comparable to experimental data, particularly the Wang method.

Conclusions:

• ANSYS simulations offer a robust and reliable method for estimating photothermal conversion efficiency (η) of plasmonic nanoparticles.
• Numerical simulations can overcome limitations posed by experimental constraints in traditional η measurement techniques.
• This study provides a comparative analysis aiding in the selection of appropriate methods for evaluating photothermal conversion efficiency.