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Probing subwavelength in-plane anisotropy with antenna-assisted infrared nano-spectroscopy

ORAL

Abstract

Infrared nano-spectroscopy based on s-SNOM has been employed to probe the vibrational fingerprints at the nanometer scale. However, s-SNOM is less sensitive to the in-plane anisotropy in general. We report a method to probe the in-plane dielectric responses of materials with the help of a metallic disk. As a demonstration, in-plane phonon responses of m-sapphire along b and c axis are identified. The LO phonon frequencies between 350 cm-1 to 800 cm-1 are determined down to a length scale of at least λ/10 without fitting parameters. Our method can be implemented to determine the in-plane anisotropy with high sensitivity, which is difficult for conventional far-field techniques.

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Presenters

  • Ziheng Yao

    Department of Physics and Astronomy, State Univ of NY - Stony Brook

Authors

  • Ziheng Yao

    Department of Physics and Astronomy, State Univ of NY - Stony Brook

  • Xinzhong Chen

    Department of Physics and Astronomy, State Univ of NY - Stony Brook, Department of Physics, Stony Brook University

  • Lukas Wehmeier

    Institute of Applied Physics, Technische Universität Dresden

  • Yinming Shao

    Department of Physics, Columbia University, Columbia Univ, Columbia University

  • Zimeng Zeng

    State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University

  • Fanwei Liu

    State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University

  • Alexander S McLeod

    Columbia University, Department of Physics, Columbia University, Columbia Univ

  • Stephanie Gilbert Corder

    The Advanced Light Source, Lawrence Berkeley National Laboratory

  • Makoto Tsuneto

    Department of Physics and Astronomy, State Univ of NY - Stony Brook

  • Suheng Xu

    Department of Physics and Astronomy, State Univ of NY - Stony Brook

  • Wu Shi

    Materials Sciences Division, Lawrence Berkeley National Laboratory

  • Zihang Wang

    University of California, Berkeley, Department of Physics

  • Wenjun Zheng

    Department of Physics and Astronomy, State Univ of NY - Stony Brook

  • Hans A Bechtel

    The Advanced Light Source, Lawrence Berkeley National Laboratory, Advanced Light Source, Lawrence Berkeley National Lab

  • G Lawrence Carr

    National Synchrotron Light Source II, Brookhaven National Laboratory

  • Michael Martin

    The Advanced Light Source, Lawrence Berkeley National Laboratory

  • Alex K Zettl

    Physics Department, University of California, Berkeley, Department of Physics, University of California, Materials Sciences Division, Lawrence Berkeley National Laboratory, Department of Physics, University of California, Berkeley

  • Dmitri Basov

    Columbia University, Department of Physics, Columbia University, Physics, Columbia University, Columbia Univ

  • Xi Chen

    State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University

  • Lukas Eng

    Institute of Applied Physics, Technische Universität Dresden, TU Dresden

  • Susanne C Kehr

    Institute of Applied Physics, Technische Universität Dresden

  • Mengkun Liu

    Stony Brook University, Department of Physics and Astronomy, State Univ of NY - Stony Brook, Department of Physics, Stony Brook University, Department of Physics and Astronomy, Stony Brook University