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Angstrom-scale flatness using selective nanoscale etching.

Takashi Yatsui1, Hiroshi Saito1, Katsuyuki Nobusada2

  • 1School of Engineering, University of Tokyo, Bunkyo-ku, Tokyo, 113-8656 Japan.

Beilstein Journal of Nanotechnology
|November 9, 2017
PubMed
Summary

A novel near-field etching technique achieves angstrom-scale surface flattening by using optical near-fields (ONFs) to selectively remove nanoscale protrusions. This method enhances device performance by minimizing carrier scattering.

Keywords:
Angstrom-scale flatnessoptical near-fieldwet etching

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Science

Background:

  • Achieving angstrom-scale surface flatness is crucial for advanced devices to prevent carrier (electron/photon) scattering and associated losses.
  • Existing methods may struggle with the precision required for ultra-flat surfaces.

Purpose of the Study:

  • To develop and validate a new surface flattening method utilizing near-field etching.
  • To demonstrate the selective removal of nanoscale protrusions using optical near-fields (ONFs).

Main Methods:

  • Developed a near-field etching technique employing ONFs to selectively dissociate molecules at surface protrusions.
  • Compared near-field etching using gas molecules and ions in liquid phase.
  • Utilized two-dimensional Fourier analysis to evaluate etching precision.

Main Results:

  • Near-field etching effectively etches nanoscale structures (<10 nm) in both wet and dry conditions.
  • Selective etching of protrusions was confirmed through comparative analysis.
  • Near-field dry etching shows promise for structures with large mean free paths.

Conclusions:

  • Near-field etching is a viable technique for achieving angstrom-scale surface flatness.
  • The method offers precise control for nanoscale surface modification.
  • Further investigation into near-field dry etching for specific applications is warranted.