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Overview of Microscopy Techniques01:22

Overview of Microscopy Techniques

The early pioneers of microscopy opened a window into the invisible world of microorganisms. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes that leveraged nonvisible light, such as fluorescence microscopy that uses an ultraviolet light source and electron microscopy that uses short-wavelength electron beams. These advances significantly improved magnification, image resolution, and contrast. By comparison, the...
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Assembly, Tuning and Use of an Apertureless Near Field Infrared Microscope for Protein Imaging
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Instrumentation for dual-probe scanning near-field optical microscopy.

A Kaneta1, R Fujimoto, T Hashimoto

  • 1Department of Electronic Science and Engineering, Kyoto University, Kyoto 615-8510, Japan.

The Review of Scientific Instruments
|September 4, 2012
PubMed
Summary

We developed a dual-probe scanning near-field optical microscope (SNOM) to study carrier motion. This novel instrument precisely controls probe distances, enabling detailed observation of carrier dynamics in InGaN quantum wells.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optics

Background:

  • Understanding local carrier motions is crucial for advanced semiconductor device performance.
  • Existing techniques often lack the spatial resolution and control to probe nanoscale carrier dynamics effectively.

Purpose of the Study:

  • To develop and demonstrate a dual-probe scanning near-field optical microscope (SNOM) for investigating local carrier motions.
  • To achieve precise control over probe-sample and inter-probe distances for enhanced optical measurements.

Main Methods:

  • Designed a dual-fiber probe SNOM system for simultaneous photoexcitation and light collection.
  • Utilized finite-difference time-domain (FDTD) method for optimizing probe design and efficiency.
  • Implemented dual-band modulation and real-time probe tip oscillation detection for precise distance control.

Main Results:

  • Successfully developed a dual-probe SNOM capable of precise distance regulation.
  • Demonstrated the ability to scan the collection probe around the illumination probe without tip damage.
  • Observed carrier motions in an Indium Gallium Nitride (InGaN) quantum well using photoluminescence spectroscopy.

Conclusions:

  • The developed dual-probe SNOM is a powerful tool for studying nanoscale carrier dynamics.
  • The precise distance control mechanism allows for unprecedented investigation of local optical properties.
  • This technique opens new avenues for characterizing semiconductor nanostructures and optimizing optoelectronic devices.