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

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 

机构地区：[1]NanoTech Lab,Department of Electrical Engineering,Information Technology University(ITU)of the Punjab,Lahore 54600,Pakistan [2]Department of Mechanical Engineering,Pohang University of Science and Technology(POSTECH),Pohang 37673,Republic of Korea [3]Department of Chemical Engineering,Pohang University of Science and Technology(POSTECH),Pohang 37673,Republic of Korea [4]POSCO-POSTECH-RIST Convergence Research Center for Flat Optics and Metaphotonics,Pohang 37673,Republic of Korea [5]National Institute of Nanomaterials Technology(NINT),Pohang 37673,Republic of Korea

出　　处：《Photonics Research》2021年第9期1667-1674,共8页光子学研究（英文版）

基　　金：POSCO(POSCO-POSTECH-RIST Convergence Research Center program);National Research Foundation of Korea(CAMM-2019M3A6B3030637,NRF-2019R1A2C3003129,NRF-2019R1A5A8080290);Higher Education Commision,Pakistan(10177/Punjab/NRPU/RD/HEC/2017);H.S.K.acknowledges the Ph.D.fellowship grant(PhDEE 17003)by ITU Lahore;Pakistan.I.K.acknowledges the NRF Sejong Science fellowship(NRF-2021R1C1C2004291)funded by the Ministry of Science;ICT of the Korean government.T.L.acknowledges the NRF Global Ph.D.fellowship(NRF-2019H1 A2A 1076295)funded by the Ministry of Education of the Korean government.Y.K.acknowledges the Hyundai Motor Chung Mong-Koo fellowship and the POSTECHIAN fellowship.J.K.acknowledges the POSTECH Alchemist fellowship.M.Q.M.,M.Z.,and K.R.acknowledge an internal research grant by ITU Lahore,Pakistan.

摘　　要：Chiro-optical effects offer a wide range of potential applications in nanophotonics,such as advanced imaging and molecular sensing and separation.Flat single-layer metasurfaces composed of subwavelength meta-atoms have gained significant attention due to their exceptional characteristics in light–matter interactions.Although metasurface-based devices have manipulated electromagnetic waves,the compact on-chip realization of giant chiro-optical effects remains a challenge at optical frequencies.In this work,we experimentally and numerically demonstrate an all-dielectric metasurface to realize large chiro-optical effects in the visible regime.Notably,the proposed strategy of utilizing achiral nanofins instead of conventional chiral structures provides an extra degree of design freedom.The 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 decomposition.The 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 

分 类 号：O43[机械工程—光学工程] TB34[理学—光学]