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    Tunable Chiral Optics in All-Solid-Phase Reconfigurable Dielectric Nanostructures
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    • Jingang Li
      Jingang Li
      Materials Science and Engineering Program, Texas Materials Institute, and Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
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      Orcidhttp://orcid.org/0000-0003-0827-9758
    • Mingsong Wang
      Mingsong Wang
      Materials Science and Engineering Program, Texas Materials Institute, and Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
      Photonics Initiative, Advanced Science Research Center and Graduate Center, City University of New York, New York, New York 10075, United States
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      Orcidhttp://orcid.org/0000-0001-9071-5517
    • Zilong Wu
      Zilong Wu
      Materials Science and Engineering Program, Texas Materials Institute, and Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
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    • Huanan Li
      Huanan Li
      Photonics Initiative, Advanced Science Research Center and Graduate Center, City University of New York, New York, New York 10075, United States
      More by Huanan Li
    • Guangwei Hu
      Guangwei Hu
      Photonics Initiative, Advanced Science Research Center and Graduate Center, City University of New York, New York, New York 10075, United States
      Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore
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      Orcidhttp://orcid.org/0000-0002-3023-9632
    • Taizhi Jiang
      Taizhi Jiang
      McKetta Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
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      Orcidhttp://orcid.org/0000-0003-1995-6187
    • Jianhe Guo
      Jianhe Guo
      Materials Science and Engineering Program, Texas Materials Institute, and Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
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    • Yaoran Liu
      Yaoran Liu
      Materials Science and Engineering Program, Texas Materials Institute, and Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
      Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
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    • Kan Yao
      Kan Yao
      Materials Science and Engineering Program, Texas Materials Institute, and Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
      More by Kan Yao
      Orcidhttp://orcid.org/0000-0002-9144-2618
    • Zhihan Chen
      Zhihan Chen
      Materials Science and Engineering Program, Texas Materials Institute, and Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
      More by Zhihan Chen
    • Jie Fang
      Jie Fang
      Materials Science and Engineering Program, Texas Materials Institute, and Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
      More by Jie Fang
    • Donglei Fan
      Donglei Fan
      Materials Science and Engineering Program, Texas Materials Institute, and Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
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      Orcidhttp://orcid.org/0000-0002-4724-2483
    • Brian A. Korgel
      Brian A. Korgel
      McKetta Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
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      Orcidhttp://orcid.org/0000-0001-6242-7526
    • Andrea Alù*
      Andrea Alù
      Photonics Initiative, Advanced Science Research Center and Graduate Center, City University of New York, New York, New York 10075, United States
      *E-mail: [email protected] (A.A.).
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    • Yuebing Zheng*
      Yuebing Zheng
      Materials Science and Engineering Program, Texas Materials Institute, and Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
      Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
      *E-mail: [email protected] (Y.Z.).
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      Orcidhttp://orcid.org/0000-0002-9168-9477
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    Nano Letters

    Cite this: Nano Lett. 2021, 21, 2, 973–979
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    https://doi.org/10.1021/acs.nanolett.0c03957
    Published December 29, 2020
    Copyright © 2020 American Chemical Society
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    Abstract

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    Subwavelength nanostructures with tunable compositions and geometries show favorable optical functionalities for the implementation of nanophotonic systems. Precise and versatile control of structural configurations on solid substrates is essential for their applications in on-chip devices. Here, we report all-solid-phase reconfigurable chiral nanostructures with silicon nanoparticles and nanowires as the building blocks in which the configuration and chiroptical response can be tailored on-demand by dynamic manipulation of the silicon nanoparticle. We reveal that the optical chirality originates from the handedness-dependent coupling between optical resonances of the silicon nanoparticle and the silicon nanowire via numerical simulations and coupled-mode theory analysis. Furthermore, the coexisting electric and magnetic resonances support strong enhancement of optical near-field chirality, which enables label-free enantiodiscrimination of biomolecules in single nanostructures. Our results not only provide insight into the design of functional high-index materials but also bring new strategies to develop adaptive devices for photonic and electronic applications.

    Copyright © 2020 American Chemical Society

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    • Experimental section including sample preparation, synthesis of SiNPs and SiNWs, setup and measurement, and simulation details; supporting Notes on Mie theory and multipole decomposition, and coupled mode theory analysis; supporting Figures S1–S20 on supporting data and analysis (PDF)

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    Nano Letters

    Cite this: Nano Lett. 2021, 21, 2, 973–979
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.nanolett.0c03957
    Published December 29, 2020
    Copyright © 2020 American Chemical Society
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