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

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  • Simone Zanotto
    Istituto Nanoscienze – CNR and Laboratorio NEST, Scuola Normale Superiore , Piazza San Silvestro 12 , 56127 Pisa , Italy
  • Giacomo Mazzamuto
    European Laboratory for Non Linear Spectroscopy , via N. Carrara 1 , Sesto Fiorentino, Firenze 50019 , Italy
  • Francesco Riboli
    European Laboratory for Non Linear Spectroscopy , via N. Carrara 1 , Sesto Fiorentino, Firenze 50019 , Italy
  • Giorgio Biasiol
    Istituto Officina dei Materiali CNR, Laboratorio TASC , Basovizza (TS) , Italy
  • Giuseppe C. La Rocca
    Scuola Normale Superiore and CNISM , Piazza dei Cavalieri 7 , 56126 Pisa , Italy
  • Alessandro Tredicucci
    Istituto Nanoscienze – CNR and Laboratorio NEST, Scuola Normale Superiore , Piazza San Silvestro 12 , 56127 Pisa , Italy
  • Alessandro Pitanti
    Istituto Nanoscienze – CNR and Laboratorio NEST, Scuola Normale Superiore , Piazza San Silvestro 12 , 56127 Pisa , Italy

抄録

<jats:title>Abstract</jats:title> <jats:p>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 of the 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 that the metasurface based on an L-shaped hole array is a minimal one. Indeed, its unit cell geometry depends on the smallest number of parameters needed to implement arbitrary transmission matrices compliant with the general symmetries for 2d-chiral structures. These observations enable more powerful wave operations in a lossless photonic environment.</jats:p>

収録刊行物

  • Nanophotonics

    Nanophotonics 8 (12), 2291-2301, 2019-11-13

    Walter de Gruyter GmbH

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