Unlocking the out-of-plane dimension for photonic bound states in the continuum to achieve maximum optical chirality  

作　　者：Lucca Kühner Fedja J.Wendisch Alexander A.Antonov Johannes Bürger Ludwig Hüttenhofer Leonardo de S.Menezes Stefan A.Maier Maxim V.Gorkunov Yuri Kivshar Andreas Tittl 

机构地区：[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 SW72AZ,UK [6]Nonlinear Physics Centre,Research School of Physics,Australian National University,Canberra,ACT 2601,Australia

出　　处：《Light(Science & Applications)》2023年第11期2423-2433,共11页光（科学与应用)（英文版）

基　　金：This work was funded by the Deutsche Forschungsgemeinschaft(DFG,German Research Foundation)under grant numbers EXC 2089/1-390776260(Germany’s Excellence Strategy)and TI 1063/1(Emmy Noether Program);the Bavarian program Solar Energies Go Hybrid(SolTech),and the Center for NanoScience(CeNS).S.A.Maier additionally acknowledges the EPSRC(EP/W017075/1);the Australian Research Council,and the Lee-Lucas Chair in Physics.The work of M.V.G.and A.A.A.was performed within the State assignment of FSRC“Crystallography and Photonics”RAS.Y.K.acknowledges a support from the Australian Research Council(grant DP210101292);as well as the International Technology Center Indo-Pacific(ITC IPAC)and Army Research Office under Contract No.FA520923C0023;Funded by the European Union(ERC,METANEXT,101078018).Views and opinions expressed are however those of the author(s)only and do not necessarily reflect those of the European Union or the European Research Council Executive Agency.Neither the European Union nor the granting authority can be held responsible for them.

摘　　要：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.

关 键 词：dielectric SYMMETRY realization 

分 类 号：O43[机械工程—光学工程]