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.

*RISE2 node of NASA's Solar System Exploration Research Virtual Institute under NASA Cooperative Agreement 80NSSC19MO2015. Advanced Light Source, a DOE Office of Science User Facility under contract no. DE-AC02-05CH11231.
Director, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division, of the US Department of Energy under Contract No. DE-AC02-05-CH11231, within the sp2-Bonded Materials Program (KC2207).
BMBF under Grant Nos. 05K16ODA and 05K19ODB
Würzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter (ct.qmat)
TU Dresden graduate academy

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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