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Giant chiro-optical responses in multipolar-resonances-based single-layer dielectric metasurfaces

Photonics Research 2021年第9期9卷 1667-1674页

作者： HAFIZ SAAD KHALIQ INKI KIM aima zahid JOOHOON KIM TAEJUN LEE TREVON BADLOE YESEUL KIM MUHAMMAD ZUBAIR KASHIF RIAZ MUHAMMAD QASIM MEHMOOD JUNSUK RHO NanoTech Lab Department of Electrical EngineeringInformation Technology University(ITU)of the PunjabLahore 54600Pakistan Department of Mechanical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea POSCO-POSTECH-RIST Convergence Research Center for Flat Optics and Metaphotonics Pohang 37673Republic of Korea National Institute of Nanomaterials Technology(NINT) Pohang 37673Republic of Korea

Chiro-optical effects offer a wide range of potential applications in nanophotonics,such as advanced imaging and molecular sensing and *** single-layer metasurfaces composed of subwavelength meta-atoms have gained significant attention due to their exceptional characteristics in light–matter *** metasurface-based devices have manipulated electromagnetic waves,the compact on-chip realization of giant chiro-optical effects remains a challenge at optical *** this work,we experimentally and numerically demonstrate an all-dielectric metasurface to realize large chiro-optical effects in the visible ***,the proposed strategy of utilizing achiral nanofins instead of conventional chiral structures provides an extra degree of design *** mutual coupling between carefully engineered nanofins produces constructive and destructive interference,leading to the asymmetric transmission of 70%and average circular dichroism exceeding 60%.We investigate the underlying mechanism behind the chiro-optical effects using the theory of multipolar *** proposed design mechanism maximizes the chiro-optical response through a single-layer metasurface with potential applications in high-efficiency integrated ultrathin polarization rotators and shapers,chiral polarizers for optical displays,chiral beam splitters,and chiral sensors.

关键词： chiral dielectric polar

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