
1.Chair in Hybrid Nanosystems, Nanoinstitute Munich, and Center for NanoScience, Faculty of Physics, Ludwig-Maximilians-University Munich, Königinstrasse 10, 80539 München, Germany
2.Shubnikov Institute of Crystallography, FSRC "Crystallography and Photonics", Russian Academy of Sciences, Moscow 119333, Russia
3.Departamento de Física, Universidade Federal de Pernambuco, 50670-901 Recife, Pernambuco, Brazil
4.School of Physics and Astronomy, Monash University, Wellington Rd, Clayton, VIC 3800, Australia
5.The Blackett Laboratory, Department of Physics, Imperial College London, London SW7 2AZ, UK
6.Nonlinear Physics Centre, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia
Yuri Kivshar (yuri.kivshar@anu.edu.au)
Andreas Tittl (andreas.tittl@physik.uni-muenchen.de)
Published:30 November 2023,
Published Online:12 October 2023,
Received:17 July 2023,
Revised:21 September 2023,
Accepted:22 September 2023
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Kühner, L. et al. Unlocking the out-of-plane dimension for photonic bound states in the continuum to achieve maximum optical chirality. Light: Science & Applications, 12, 2423-2433 (2023).
Kühner, L. et al. Unlocking the out-of-plane dimension for photonic bound states in the continuum to achieve maximum optical chirality. Light: Science & Applications, 12, 2423-2433 (2023). DOI: 10.1038/s41377-023-01295-z.
The realization of lossless metasurfaces with true chirality crucially requires the fabrication of three-dimensional structures
constraining experimental feasibility and hampering practical implementations. Even though the three-dimensional assembly of metallic nanostructures has been demonstrated previously
the resulting plasmonic resonances suffer from high intrinsic and radiative losses. The concept of photonic bound states in the continuum (BICs) is instrumental for tailoring radiative losses in diverse geometries
especially when implemented using lossless dielectrics
but applications have so far been limited to planar structures. Here
we introduce a novel nanofabrication approach to unlock the height of individual resonators within all-dielectric metasurfaces as an accessible parameter for the efficient control of resonance features and nanophotonic functionalities. In particular
we realize out-of-plane symmetry breaking in quasi-BIC metasurfaces and leverage this design degree of freedom to demonstrate an optical all-dielectric quasi-BIC metasurface with maximum intrinsic chirality that responds selectively to light of a particular circular polarization depending on the structural handedness. Our experimental results not only open a new paradigm for all-dielectric BICs and chiral nanophotonics
but also promise advances in the realization of efficient generation of optical angular momentum
holographic metasurfaces
and parity-time symmetry-broken optical systems.
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