Photonic bands, superchirality, and inverse design of a chiral minimal metasurface

Year: 2019

Authors: Zanotto S., Mazzamuto G., Riboli F., Biasiol G., La Rocca G. C., Tredicucci A., Pitanti A.

Autors Affiliation: Istituto Nanoscienze – CNR and Laboratorio NEST; Istituto Nazionale di Ottica INO – CNR Sesto Fiorentino; European Laboratory for Non Linear Spectroscopy; Istituto Officina dei Materiali CNR, Laboratorio TASC: Scuola Normale Superiore and CNISM

Abstract: Photonic band structures are a typical fingerprint of periodic optical structures, and are usually observed in spectroscopic quantities such as transmission, reflection, and absorption. Here we show that the chiro-optical response of a metasurface constituted by a lattice of non-centrosymmetric, L-shaped holes in a dielectric slab shows a band structure, where intrinsic and extrinsic chirality effects are clearly recognized and connected to localized and delocalized resonances. Superchiral near-fields can be excited in correspondence to these resonances, and anomalous behaviors as a function ofthe incidence polarization occur. Moreover, we have introduced a singular value decomposition (SVD) approach to show that the above mentioned effects are connected to specific fingerprints of the SVD spectra. Finally, by means of an inverse design technique we have demonstrated.

Journal/Review: NANOPHOTONICS

Volume: 8 (12)      Pages from: 2291  to: 2301

KeyWords: superchirality, photonic bands
DOI: 10.1515/nanoph-2019-0321

Citations: 8
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