4.8 Article

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

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NATURE COMMUNICATIONS
卷 12, 期 1, 页码 -

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NATURE RESEARCH
DOI: 10.1038/s41467-021-22844-3

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资金

  1. RISE2 node of NASA's Solar System Exploration Research Virtual Institute under NASA [80NSSC19MO2015]
  2. U.S. Department of Energy, Office of Science, National Quantum Information Science Research Centers, Co-design Center for Quantum Advantage (C2QA) [DE-SC0012704]
  3. Advanced Light Source, a DOE Office of Science User Facility [DE-AC02-05CH11231]
  4. Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division, of the US Department of Energy within the sp2-Bonded Materials Program [DE-AC02-05-CH11231, KC2207]
  5. ALS Doctoral Fellowship in Residence Program
  6. BMBF [05K16ODA, 05K19ODB]
  7. Wurzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter (ct.qmat)
  8. TU Dresden graduate academy

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s-SNOM is a powerful tool commonly used for infrared nano-spectroscopy, but it lacks sensitivity to in-plane sample anisotropy. Authors introduce a method involving a metallic microdisk antenna to improve sensitivity by probing in-plane phonon responses.
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 350cm(-1) to 800cm(-1) that correspond to LO phonon modes along the crystal b- and c-axis are determined with a spatial resolution of

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