Anti Stokes Thermometry for Single Plasmonic Nanoparticles

Anti Stokes Thermometry for Single Plasmonic Nanoparticles - Featured

Title: Anti Stokes Thermometry for Single Plasmonic Nanoparticles
When: Monday, March 18, 2024, 12:00
Place: Department of Theoretical Condensed Matter Physics, Faculty of Sciences, Module 5, Seminar Room (5th Floor)
Speaker: Julian Gargiulo, Instituto de Nanosistemas, Universidad Nacional de San Martín, Buenos Aires, Argentina.

Metallic nanoparticles (NPs) present strong photothermal responses, meaning that they are efficient nanoscale transducers of light into heat. However, temperature is hard to estimate, hard to control and hard to measure in the nanoscale [1]. Here, I will present two tools for the investigation of the photothermal properties of single particles. First, I will introduce Optical Printing. This technique uses highly focused laser beams to capture individual NPs from colloidal suspensions and fix them into predefined locations with an accuracy higher than 50 nm. This enables the fabrication of patterns of arbitrary design on plane substrates, which facilitates the systematic study of individual NPs [2]. Then, I will introduce Anti Stokes thermometry, a technique that enables direct and non-invasive temperature measurements without labelling or prior calibration [3]. Using this technique, we studied the link between morphology and light-to-heat conversion of bimetallic Au/Pd nanoparticles with two different configurations: core–shell and core-satellite [4]. Finally, I will discuss the ongoing experiments regarding the application of Anti Stokes thermometry to other hybrid plasmonic systems.

References

  1. Martinez, L. et al. Thermometries for Single Nanoparticles Heated with Light. ACS Sensors. Just Accepted. DOI: 10.1021/acssensors.4c00012 (2024).
  2. Violi, I. L., et al. Challenges on optical printing of colloidal nanoparticles. The Journal of Chemical Physics 156, no. 3 (2022).
  3. Barella, M. et al. In situ photothermal response of single gold nanoparticles through hyperspectral imaging anti-stokes thermometry. ACS Nano 15, 2458–2467 (2021).
  4. Gargiulo, J. et al. Impact of bimetallic interface design on heat generation in plasmonic Au/Pd nanostructures studied by single-particle thermometry. Nature Communications. 14, 3813. (2023
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