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Proceedings Paper

Enhancing light-matter interaction in all-dielectric photonic crystal metasurfaces
Author(s): Silvia Romano; Gianluigi Zito; Erika Penzo; Sofía Natalí Lara Yépez; Stefano Cabrini; Anna Chiara De Luca; Ivo Rendina; Vito Mocella
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Paper Abstract

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 plasmonic systems. It has been demonstrated that an all-dielectric photonic crystal (PhC) metasurface can support bound states in the continuum (BICs) - resonant states of infinite lifetime - due to the interaction between trapped electromagnetic modes. Experimentally, this involves very narrow coupled resonances, with a high Q-factor and a possible extremely large field intensity enhancement, up to 6 orders of magnitude. Here, we demonstrate that the field enhancement in proximity of the surface can be explored to boost lightmatter interaction in spectroscopic sensing. We design and realize an innovative sensing scheme for bulk and surface measurement with ultra-high figure of merit for the recognition of protein-protein interaction and the detection of low molecular weight molecules. In addition, we design a dielectric dual scheme based on metasurfaces supporting BICs to amplify fluorescence emission and Raman scattering of probe molecules dispersed on the surface of the PhC. Our results provide new solutions for light manipulation at the nanoscale, especially for sensing and nonlinear optics applications.

Paper Details

Date Published: 11 April 2019
PDF: 5 pages
Proc. SPIE 11028, Optical Sensors 2019, 110280I (11 April 2019); doi: 10.1117/12.2524651
Show Author Affiliations
Silvia Romano, National Research Council, CNR-IMM (Italy)
Gianluigi Zito, National Research Council, CNR-IBP (Italy)
Erika Penzo, Lawrence Berkeley National Lab. (United States)
Sofía Natalí Lara Yépez, National Research Council, CNR-IMM (Italy)
Stefano Cabrini, Lawrence Berkeley National Lab. (United States)
Anna Chiara De Luca, National Research Council, CNR-IBP (Italy)
Ivo Rendina, National Research Council, CNR-IMM (Italy)
Vito Mocella, National Research Council, CNR-IMM (Italy)

Published in SPIE Proceedings Vol. 11028:
Optical Sensors 2019
Francesco Baldini; Jiri Homola; Robert A. Lieberman, Editor(s)

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