GHz-THz near-field imaging of extreme subwavelength metal structures

ORAL

Abstract

Modern scattering-type scanning near-field optical microscopy (s-SNOM) has become an indispensable tool in material research. In this talk we present a home-built GHz-THz s-SNOM using Schottky diodes as both light source and detector, achieving unprecedented spatial resolution at long wavelength (~2 mm). We systematically investigated a series of extreme subwavelength metallic nanostructures at the micrometer scale. The near-field material contrast is found to be greatly impacted by the lateral size and connectivity of the nanostructures, which is drastically different from the cases at shorter wavelengths (e.g. IR s-SNOM). The observed phenomena can be explained by a quasi-static analysis and full-wave electromagnetic simulations. Our results reveal that s-SNOM with long wavelength excitation is an ideal candidate for investigating the electrostatic behavior of metallic devices.

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Presenters

  • Xinzhong Chen

    • Stonybrook University
    • State Univ of NY - Stony Brook

Authors

  • Xinzhong Chen

    • Stonybrook University
    • State Univ of NY - Stony Brook

  • Xiao Liu

    • University of Shanghai for Science and Technology

  • Xiangdong Guo

    • National Center for Nanoscience and Technology

  • Shu Chen

    • CIC nanoGUNE

  • Hai Hu

    • National Center for Nanoscience and Technology
    • Nanophotonics Research Division, National Center for Nanoscience and Technology

  • Elizaveta Nikulina

    • CIC nanoGUNE

  • Ziheng Yao

    • Stonybrook University
    • State Univ of NY - Stony Brook

  • Hans Bechtel

    • Advanced Light Source Division, Lawrence Berkeley National Lab
    • Lawrence Berkeley National Lab
    • Lawrence Berkeley National Laboratory

  • Michael Martin

    • Advanced Light Source Division, Lawrence Berkeley National Lab
    • Lawrence Berkeley National Laboratory

  • G Carr

    • National Synchrotron Light Source II, Brookhaven National Lab
    • Brookhaven National Lab
    • Brookhaven National Laboratory

  • Qing Dai

    • National Center for Nanoscience and Technology
    • Nanophotonics Research Division, National Center for Nanoscience and Technology

  • Songlin Zhuang

    • University of Shanghai for Science and Technology

  • Qing Hu

    • Massachusetts Institute of Technology

  • Yiming Zhu

    • University of Shanghai for Science and Technology

  • Rainer Hillenbrand

    • CIC nanoGUNE
    • nanoGUNE and Ikerbasque

  • Mengkun Liu

    • Stonybrook University
    • State Univ of NY - Stony Brook

  • Guanjun You

    • University of Shanghai for Science and Technology