Quantitative Temperature Measurements in Gold Nanorods Using Digital Holography

Area of Science:

• Physics
• Materials Science
• Nanotechnology

Background:

• Accurate temperature characterization at the nanoscale is crucial for photothermal applications.
• Existing methods for measuring nanoparticle temperature often lack precision or require calibration.

Purpose of the Study:

• To introduce a novel, calibration-free approach for quantitative temperature measurements on individual nanoparticles.
• To investigate the relationship between nanoparticle aspect ratio and temperature under photothermal stimulation.

Main Methods:

• Combining modulated photothermal stimulation with heterodyne digital holography.
• Utilizing full-field reconstructed holograms for temperature determination.
• Analyzing the aspect ratio's effect on gold nanoparticle temperature.

Main Results:

• Achieved temperature determination with a precision of 0.3 K.
• Demonstrated a simple, calibration-free measurement approach.
• Observed good agreement between experimental results and numerical simulations for gold nanoparticles.

Conclusions:

• The proposed method offers a precise and straightforward way to measure nanoscale temperatures.
• This technique is valuable for understanding photothermal effects in nanoparticles.
• The study provides insights into nanoparticle temperature behavior based on their geometry.