Flat pathways to maximum optical chirality

Gorkunov, Maxim, Antonov, Alexander, Muljarov, Egor ORCID: https://orcid.org/0000-0002-2878-4148 and Kivshar, Yuri 2024. Flat pathways to maximum optical chirality. Presented at: Eighteenth International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials), Chania, Greece, 09-14 September 2024. 2024 Eighteenth International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials). IEEE, pp. 1-3. 10.1109/metamaterials62190.2024.10703311

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Abstract

Dielectric metasurfaces with eigenstates designed to selectively couple to circularly polarized light offer a game-changing platform for advanced chiral metaphotonics. Current designs rely on breaking the mirror symmetry by variable height, elevation or tilt of subwavelength meta-atoms, which complicates their fabrication. We discuss novel strategies for achieving maximum optical chirality with metasurfaces composed of flat layers processed with conventional two-dimensional lithography. Apart from extrinsic-chiral arrangements, which owe their broken mirror symmetry to a sample tilt, various single- and multi-layer designs are capable of maximizing intrinsic chirality at the normal incidence. We reveal specific conditions, when even weak symmetry-breaking effect of a transparent substrate can lead to maximum chirality.

Item Type:	Conference or Workshop Item (Paper)
Date Type:	Published Online
Status:	Published
Schools:	Physics and Astronomy
Publisher:	IEEE
ISBN:	9798350373493
Date of First Compliant Deposit:	13 January 2025
Last Modified:	13 Feb 2025 02:45
URI:	https://orca.cardiff.ac.uk/id/eprint/173180

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