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Enhanced optical chirality with directional emission of Surface Plasmon Polaritons for chiral sensing applications

Abstract: Chirality is a crucial aspect in life sciences, where systems capable of enhancing the chiroptical properties of molecules are highly demanded. In this work, we present a numerical proof of concept of a novel approach towards chiral sensing, consisting in the measurement of chiroptical properties via the directional emission of Surface Plasmon Polaritons (SPPs) on a metasurface. Based on the enhanced differential absorption between right and left circularly polarized light upon interaction with a metasurface made of high refractive index dielectric unit cells, a polarization-dependent SPP differential emission is obtained. Furthermore, the plasmonic emission direction is entirely dependent on the polarization handedness. Using FDTD numerical methods we report Circular Dichroism signals of around -6° for the unit cell, with threefold dissymmetry factor enhancements in places accessible to analytes. We believe that this work sets a brand-new branch in chiral sensing towards faster, real-time measurements.

 Autoría: Serrera G., González-Colsa J., Giannini V., Saiz J.M., Albella P.,

 Fuente: Journal of Quantitative Spectroscopy and Radiative Transfer, 2022, 284, 108166

 Editorial: Elsevier Ltd

 Fecha de publicación: 12/03/2022

 Nº de páginas: 7

 Tipo de publicación: Artículo de Revista

 DOI: 10.1016/j.jqsrt.2022.108166

 ISSN: 0022-4073,1879-1352

 Proyecto español: PGC2018-096649-B-I

 Url de la publicación: https://doi.org/10.1016/j.jqsrt.2022.108166