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Related Experiment Videos

Imaging tip formation in single-mode optical fibres.

B A Puygranier1, S Montgomery, J Ashe

  • 1School of Maths and Physics, Queen's University of Belfast, UK.

Ultramicroscopy
|February 24, 2001
PubMed
Summary

Chemically etching single-mode optical fibers creates precise probe tips for scanning probe microscopy (SPM). Atomic force microscopy (AFM) confirms the tip structure and validates a predictive model for tip geometry.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optical Engineering

Background:

  • Scanning probe microscopy (SPM) relies on precisely fabricated probe tips.
  • Chemical etching is a common method for producing SPM probe tips.
  • Understanding tip formation is crucial for optimizing SPM performance.

Purpose of the Study:

  • To develop and characterize probe tips for optical SPM using chemical etching of single-mode optical fibers.
  • To investigate the tip evolution and resulting topography using atomic force microscopy (AFM).
  • To validate a predictive model for tip geometry based on etch rates and fiber dimensions.

Main Methods:

  • Single-mode optical fibers were chemically etched using hydrofluoric (HF) acid buffered with ammonium fluoride at variable temperatures.

Related Experiment Videos

  • Tip formation was monitored by interrupting the etching process at various stages.
  • Atomic force microscopy (AFM) was used to image the tip end-structure and measure cone angles.

    • Main Results:

    • AFM imaging revealed a distinct ring structure in the cladding and a core tip with a central depression for visible-regime fibers.
    • The chemical etching process effectively translated compositional variations into three-dimensional topography.
    • For standard single-mode fibers, measured tip cone angles aligned with model predictions across various etch conditions.

    Conclusions:

    • Chemical etching is an effective method for fabricating high-quality probe tips for optical SPM from single-mode optical fibers.
    • The developed model accurately predicts tip geometry for single-mode fibers, utilizing core/cladding etch rates and core diameter.
    • This study demonstrates the utility of AFM for in-situ monitoring and characterization of SPM probe tip formation.