*** Keynote Speaker ***

Prof. Giulia Tagliabue
Laboratory of Nanoscience for Energy Technologies (LNET – IGM – STI), EPFL


Controlling Charge and Heat Generation with Photonic Metasurfaces


In the last decade, optical nanoantennas have revolutionized light manipulation and control at the nanoscale. Light absorption was initially considered a purely detrimental process, reducing the efficiency of optoelectronic devices. Recently, however, it has attracted growing interest, enabling novel light-energy conversion pathways. In particular, change and heat generation can be precisely controlled at the nanoscale by photonic metasurfaces, i.e. two-dimensional arrays of optical nanoresonators.
In this talk, I will first show how charge generation in metals can be leveraged to control photoelectrochemical reactions and to understand fundamental electronic processes [1]. Then, I will show how thermo-optical effects in resonant nanostructures can be leveraged to realize thermally reconfigurable optical components, such as metalenses [2].

[1] J. Ma, K. Oh, G. Tagliabue, Understanding Wavelength-Dependent Synergies between Morphology and Photonic Design in TiO2-Based Solar Powered Redox Cells, JPhysChemC, 2022
[2] A. Archetti, RJ Lin, N. Restori, F. Kiani, T. Tsoulos, G. Tagliabue, Thermally Reconfigurable Metalens, Nanophotonics, 2022


Dr. Giulia Tagliabue is a Tenure-track Assistant Professor in the Department of Mechanical Engineering at EPFL. She joined the Engineering faculty in January 2019 and she is the head of the Laboratory of Nanoscience for Energy Technologies (LNET). She obtained her PhD in Mechanical Engineering from ETH Zurich in 2015. From 2015 to 2018 she was a Swiss National Science Foundation Fellow and she carried on her postdoctoral research jointly at Caltech and the Joint Center for Artificial Photosynthesis (JCAP). Dr. Tagliabue’s research focuses on the study of fundamental mechanisms and nanophotonic-design strategies for light-energy conversion devices, with a special interest for light-energy storage systems. Dr. Tagliabue is the recipient of the First Prize of the Rising Stars of Light Award 2020 and the 2021 Early Career Award in Nanophotonics. In 2020 she was awarded an Eccellenza Grant from SNSF and in 2022 she received an SNSF Starting Grant. She is member of the Material Research Society (MRS), the American Chemical Society (ACS) and the Optical Society of America (Optica).