Journal
LASER & PHOTONICS REVIEWS
Volume 17, Issue 10, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/lpor.202300186
Keywords
circular dichroism; Mie surface lattice resonances; optical chirality; planar metasurfaces
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This study proposes and demonstrates chiral all-dielectric metasurfaces based on Mie surface lattice resonances (SLRs) with high quality factors and strong chirality. The high-Q and strong chirality are achieved by perturbing the lattice and tilting the incidence angle. These findings provide a new direction for realizing high-performance chiral metasurfaces and have great potential in biochemical sensing, emission or lasing, and nonlinear optics.
Planar chiral metasurfaces have emerged as a versatile platform for manipulating chiral light-matter interactions in diverse applications. However, it remains challenging to achieve high quality factors together with strong chirality. Here, chiral all-dielectric metasurfaces with a high Q factor of 1220 and relatively large planar chirality of circular dichroism -0.37 under normal incidence, or with a high Q factor of 872 and large extrinsic 3D chirality of circular dichroism 0.7, based on Mie surface lattice resonances (SLRs) are proposed and experimentally demonstrated. Both SLR-induced planar chirality under normal incidence and SLR-assisted extrinsic 3D chirality under oblique incidence are achieved by perturbing the square lattice and by slightly tilting the incidence angle, respectively. It shows that the high-Q and strong chirality arises from the different excitation efficiencies of Mie SLRs under the incidences of left- and right-handed circularly polarized light. With these findings, this study provides a new direction for realizing high-performance chiral metasurfaces and holds great promise for chiral nanophotonic applications in biochemical sensing, emission or lasing, and nonlinear optics.
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