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

Author

Listed:
  • Ziheng Yao

    (Stony Brook University
    Lawrence Berkeley National Laboratory)

  • Xinzhong Chen

    (Stony Brook University)

  • Lukas Wehmeier

    (Technische Universität Dresden
    Technische Universität Dresden)

  • Suheng Xu

    (Stony Brook University
    Columbia University)

  • Yinming Shao

    (Columbia University)

  • Zimeng Zeng

    (Tsinghua University)

  • Fanwei Liu

    (Tsinghua University)

  • Alexander S. Mcleod

    (Columbia University)

  • Stephanie N. Gilbert Corder

    (Lawrence Berkeley National Laboratory)

  • Makoto Tsuneto

    (Stony Brook University)

  • Wu Shi

    (Lawrence Berkeley National Laboratory
    University of California
    Fudan University)

  • Zihang Wang

    (University of California)

  • Wenjun Zheng

    (Stony Brook University)

  • Hans A. Bechtel

    (Lawrence Berkeley National Laboratory)

  • G. L. Carr

    (Brookhaven National Laboratory)

  • Michael C. Martin

    (Lawrence Berkeley National Laboratory)

  • Alex Zettl

    (Lawrence Berkeley National Laboratory
    University of California)

  • D. N. Basov

    (Columbia University)

  • Xi Chen

    (Tsinghua University)

  • Lukas M. Eng

    (Technische Universität Dresden
    Technische Universität Dresden)

  • Susanne C. Kehr

    (Technische Universität Dresden)

  • Mengkun Liu

    (Stony Brook University
    Brookhaven National Laboratory)

Abstract

Infrared nano-spectroscopy based on scattering-type scanning near-field optical microscopy (s-SNOM) is commonly employed to probe the vibrational fingerprints of materials at the nanometer length scale. However, due to the elongated and axisymmetric tip shank, s-SNOM is less sensitive to the in-plane sample anisotropy in general. In this article, we report an easy-to-implement method to probe the in-plane dielectric responses of materials with the assistance of a metallic disk micro-antenna. As a proof-of-concept demonstration, we investigate here the in-plane phonon responses of two prototypical samples, i.e. in (100) sapphire and x-cut lithium niobate (LiNbO3). In particular, the sapphire in-plane vibrations between 350 cm−1 to 800 cm−1 that correspond to LO phonon modes along the crystal b- and c-axis are determined with a spatial resolution of

Suggested Citation

  • Ziheng Yao & Xinzhong Chen & Lukas Wehmeier & Suheng Xu & Yinming Shao & Zimeng Zeng & Fanwei Liu & Alexander S. Mcleod & Stephanie N. Gilbert Corder & Makoto Tsuneto & Wu Shi & Zihang Wang & Wenjun Z, 2021. "Probing subwavelength in-plane anisotropy with antenna-assisted infrared nano-spectroscopy," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-22844-3
    DOI: 10.1038/s41467-021-22844-3
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