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The localization of the electromagnetic field at the nanoscale can play a key role in many applications, such as sensing, spectroscopy and energy conversion. In the last years, great efforts have been performed to study and realize all-dielectric loss-free nanostructures to confine the radiation without the limits imposed by the plasmonic systems. Here we demonstrate that the field enhancement in proximity of a photonic crystal metasurface supporting bound states in the continuum can be explored to boost the light-matter interaction. We design and realize an innovative sensing scheme for bulk and surface measurement with ultra-high figure of merit and apply this new configuration for studying a specific protein-protein interaction. The recognition scheme can be coupled to a fluorescence-based sensing approach, which exploits the capability of the sensor to strongly enhance fluorescence signals. Our results provide …
Publication date: 
1 Mar 2020

Silvia Romano, Gianluigi Zito, Sofía Natalí Lara Yépez, Erika Penzo, Stefano Cabrini, Giuseppe Coppola, Ivo Rendina, Anna Chiara De Luca, Vito Mocella

Biblio References: 
Volume: 1461 Issue: 1 Pages: 012138