Multifunctional resonant wavefront-shaping meta-optics based on multilayer and multi-perturbation nonlocal metasurfaces  

作　　者：STEPHANIE CMALEK ADAM COVERVIG ANDREA ALÙ NANFANG YU 

机构地区：[1]Department of Applied Physics and Applied Mathematics,Columbia University,New York,NY 10027,USA [2]Photonics Initiative,Advanced Science Research Center,City University of New York,New York,NY 10031,USA [3]Physics Program,Graduate Center,City University of New York,New York,NY 10016,USA

出　　处：《Light(Science & Applications)》2022年第9期2194-2206,共13页光（科学与应用)（英文版）

基　　金：supported by the Nationall Science Foundation(grant no.QI-TAQ5-1936359 and no.ECCS-2004685)and the Air Force fice of Scientifc Research(grant no.FA9550-14-1-0389 and no,FA9550-16-03221.S.C.M.acknowledges support from the NSF Graduate Research Fellowship Program(grant no.DGE-1644869).ACO.acknowledges support from the NSF IGERT program(grant no.DGE-1069240).Device fabrication was carried out at the Columbia Nano lnitiative dleanoom,and at the Advanced Science Research Center NanoFabrication Facility at the Gradute Center of the City University of New York.

摘　　要：Photonic devices rarely provide both elaborate spatial control and sharp spectral control over an incoming wavefront.In optical metasurfaces,for example,the localized modes of individual meta-units govern the wavefront shape over a broad bandwidth,while nonlocal lattice modes extended over many unit cells support high quality-factor resonances.Here,we experimentally demonstrate nonlocal dielectric metasurfaces in the near-infrared that offer both spatial and spectral control of light,realizing metalenses focusing light exclusively over a narrowband resonance while leaving off-resonant frequencies unaffected.Our devices attain this functionality by supporting a quasi-bound state in the continuum encoded with a spatially varying geometric phase.We leverage this capability to experimentally realize a versatile platform for multispectral wavefront shaping where a stack of metasurfaces,each supporting multiple independently controlled quasi-bound states in the continuum,molds the optical wavefront distinctively at multiple wavelengths and yet stay transparent over the rest of the spectrum.Such a platform is scalable to the visible for applications in augmented reality and transparent displays.

关 键 词：spectrum RESONANT supporting 

分 类 号：O17[理学—数学]