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Passive near-field imaging via grating-based spectroscopy.

R Sakuma1, K-T Lin2, S Kim3

  • 1Department of Precision Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8654, Japan.

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Summary
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We developed a new passive infrared spectroscopy technique for analyzing surface waves. This method allows detailed spectral analysis of nanoscale thermal phenomena without external heating, enhancing surface analysis capabilities.

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Area of Science:

  • Physics
  • Materials Science
  • Nanotechnology

Background:

  • Passive scattering-type scanning near-field optical microscopy (s-SNOM) studies long-wavelength infrared (LWIR) waves, imaging nanoscale thermal effects like hot-electron energy dissipation and Joule heating.
  • Current passive LWIR s-SNOM lacks wavelength selection, hindering detailed analysis of surface-localized waves.

Purpose of the Study:

  • To develop a novel passive scanning near-field optical spectroscopy system for LWIR waves.
  • To enable spectral analysis of thermally excited evanescent waves with high spatial resolution.
  • To overcome limitations of existing methods for analyzing nanoscale thermal phenomena.

Main Methods:

  • Development of a passive scanning near-field optical spectroscopy system incorporating a diffraction grating.
  • Design of spectroscopic optics for high signal efficiency and mechanical stability at liquid helium temperatures (4.2 K).
  • Detection and spectral analysis of thermally excited evanescent waves on a SiC/Au micropatterned sample.

Main Results:

  • Successful detection of thermally excited evanescent waves at room temperature with 200 nm spatial resolution and 500 nm wavelength resolution in the 14-15 µm range.
  • Obtained spectra align with electromagnetic local density of states calculations based on the fluctuation-dissipation theorem.
  • Demonstrated direct spectral information acquisition of evanescent waves, unaffected by environmental heat.

Conclusions:

  • The developed passive LWIR near-field spectroscopy is a high-performance tool for spectral analysis of ultrasmall surface-localized waves.
  • This technique provides new capabilities for studying nanoscale thermal dissipation and energy transport.
  • Enables detailed characterization of materials and devices at the nanoscale using infrared spectroscopy.