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

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 also 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 introduce a singular value decomposition (SVD) approach to show that the above mentioned effects are connected to specific fingerprints of the SVD spectra. Finally, we demonstrate by means of an inverse design technique 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.

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Cited by in corpus (5)

• Optomechanics of chiral dielectric metasurfaces
• Vertical routing of spinning dipoles radiation from a chiral metamembrane
• High-resolution acoustic field mapping of GHz phononic crystals with atomic force microscopy
• Gigahertz modulation of a fully dielectric nonlocal metasurface
• Topological photonics in nanoscaled systems with far field radiation and polarization singularities