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Abstract:

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.

Short bio:
Julian Gargiulo co-leads the Nanophotonics Group at the Nanosystems Institute, National University of San Martín UNSAM, Argentina. Assistant Investigator at CONICET.
2012: Licenciado in physical sciences – University of Buenos Aires
2017: PhD in physical sciences – University of Buenos Aires. PhD Supervisor Prof. Dr. Fernando Stefani. Giambiagi Prize for the “Best thesis in experimental physics in the period 2016-2017” by the AFA (Argentinian Physics Society).
2018: Marie Skłodowska Curie Fellow at Imperial College London, United Kingdom in the Hybrid Nanosystems Research Group led by Stefan Maier.
2020-2022: DAAD PRIME Fellow and Humboldt Fellow at LMU, Germany in the Chair in Hybrid Nanosystems.
2023: Assistant Investigator at CONICET
2023: Young Investigator Award from the Argentine Academy of Nacional Sciences, in the field of Physics.

Comunicación IO-CSIC
cultura.io@io.cfmac.csic.es