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Studying molecules and nanoparticles one at a time provides valuable information about their chemistry and physics, including temporal dynamics and heterogeneity. Our group developed a technique using microresonators as ultrasensitive thermometers, with which we study single nanoparticles using photothermal absorption spectroscopy. I will present recent progress in which we applied this technique to study and control the chemical dynamics of single gold nanorods under aqueous conditions. This advancement adds both to the toolkit of single particle techniques and the versatility of microresonator technology. I will also describe outstanding challenges and recent progress in adapting this technique for more sensitive experiments.
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Levi T. Hogan, Randall H. Goldsmith, Feng Pan, Cecilia H. Vollbrecht, "Microresonator photothermal absorption spectroscopy: study and control of single nanoparticle morphology," Proc. SPIE PC11987, Laser Resonators, Microresonators, and Beam Control XXIV, PC119870E (1 April 2022); https://doi.org/10.1117/12.2614478