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Unlocking the out-of-plane dimension for photonic bound states in the continuum to achieve maximum optical chirality 被引量:3
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作者 Lucca Kühner Fedja J.Wendisch +7 位作者 Alexander A.Antonov Johannes Bürger Ludwig Hüttenhofer Leonardo de S.Menezes Stefan A.Maier maxim v.gorkunov Yuri Kivshar Andreas Tittl 《Light(Science & Applications)》 SCIE EI CSCD 2023年第11期2423-2433,共11页
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 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 threedimensional 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. 展开更多
关键词 dielectric SYMMETRY realization
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