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High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings
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A sensitive near-field microscope for thermal radiation.

Yusuke Kajihara1, Keishi Kosaka, Susumu Komiyama

  • 1Department of Basic Science, The University of Tokyo, Komaba 3-8-1, Meguro-ku, Tokyo 153-8902, Japan.

The Review of Scientific Instruments
|April 8, 2010
PubMed
Summary

Researchers developed a new infrared microscope using a sensitive phototransistor detector. This tool images thermal radiation from surfaces with sub-300 nm resolution without external light.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Nanotechnology

Background:

  • Near-field optical microscopy offers high spatial resolution.
  • Long-wavelength infrared (LWIR) imaging is crucial for thermal analysis.
  • Developing sensitive detectors for LWIR microscopy remains a challenge.

Purpose of the Study:

  • To develop a scattering-type scanning near-field optical microscope (s-SNOM) operating in the LWIR region.
  • To demonstrate label-free thermal imaging of nanostructures using LWIR.
  • To achieve high spatial resolution in LWIR near-field microscopy.

Main Methods:

  • Utilized a charge-sensitive infrared phototransistor as an extremely sensitive detector.
  • Employed a tungsten probe on a quartz tuning fork controlled in shear-force mode.
  • Periodically scattered evanescent waves at the sample surface by modulating the probe normal to the surface.

Main Results:

  • Successfully demonstrated LWIR near-field microscopy of thermal radiation from room-temperature Au/GaAs gratings.
  • Achieved a spatial resolution better than 300 nm.
  • Operated the microscope without external illumination or excitation, enabling label-free imaging.

Conclusions:

  • The developed LWIR s-SNOM is a powerful tool for nanoscale thermal imaging.
  • The use of a highly sensitive phototransistor detector enables sensitive detection of thermal LWIR radiation.
  • This technique opens new avenues for studying thermal properties of materials at the nanoscale.