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Assembly, Tuning and Use of an Apertureless Near Field Infrared Microscope for Protein Imaging
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Published on: November 25, 2009

Submicrometer infrared surface imaging using a scanning-probe microscope and an optical parametric oscillator laser.

Graeme A Hill1, James H Rice, Stephen R Meech

  • 1School of Chemical Science and Pharmacy, University of East Anglia, Norwich NR4 7TJ, UK.

Optics Letters
|April 18, 2009
PubMed
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Researchers developed submicrometer infrared (IR) surface imaging using an atomic force microscope (AFM) and a laser. This novel top-down approach achieves high-resolution imaging for potential new applications.

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Area of Science:

  • Spectroscopy and Microscopy
  • Nanotechnology
  • Materials Science

Background:

  • Infrared (IR) spectroscopy is crucial for chemical analysis.
  • Atomic Force Microscopy (AFM) provides high-resolution surface topography.
  • Overcoming the diffraction limit in IR imaging is a significant challenge.

Purpose of the Study:

  • To develop a submicrometer IR surface imaging technique.
  • To achieve imaging resolution beyond the diffraction limit.
  • To demonstrate a novel application of AFM for IR detection.

Main Methods:

  • Utilized an infrared optical parametric oscillator laser source.
  • Integrated the laser with a commercial atomic force microscope (AFM).
  • Employed induced resonant oscillations in an AFM cantilever as the detection mechanism.

Main Results:

  • Achieved submicrometer IR surface imaging with resolution better than the diffraction limit.
  • Demonstrated top-down illumination and a benchtop IR source for IR-AFM.
  • Simultaneously recorded IR absorption and AFM topography images of polystyrene beads.
  • Obtained an image resolution of 200 nm.

Conclusions:

  • The developed technique offers a new method for high-resolution IR surface imaging.
  • Top-down illumination and benchtop IR source enhance the technique's applicability.
  • This advancement extends the potential applications of IR-AFM for nanoscale chemical analysis.