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True Tapping Mode Scanning Near-Field Optical Microscopy with Bent Glass Fiber Probes.

A Smirnov1, V M Yasinskii2, D S Filimonenko2

  • 1Laboratoire de Physique de la Matière Vivante, IPHYS, Ecole Polytechnique Fédérale de Lausanne, BSP-408, 1015 Lausanne, Switzerland.

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Summary
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This study explores using bent fiber probes for tapping mode scanning near-field optical microscopy. Careful probe design is crucial for achieving the desired tapping feedback, enhancing imaging capabilities.

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Area of Science:

  • Physics
  • Materials Science
  • Nanotechnology

Background:

  • Scanning near-field optical microscopy (SNOM) commonly uses shear force feedback with quartz tuning fork (TF) probes.
  • Tapping mode feedback offers potential advantages for SNOM but requires specific probe designs.

Purpose of the Study:

  • To investigate the feasibility and requirements for realizing tapping mode feedback using bent fiber probes in SNOM.
  • To analyze the vibration modes of bent fiber probes and identify parameters for achieving true tapping mode dithering.

Main Methods:

  • Detailed analysis of fiber vibration modes in bent fiber probes.
  • Fabrication of bent fiber probes using CW CO2 laser irradiation of tapered etched glass fibers.
  • Attachment of probes to quartz tuning forks (TF) under double resonance conditions.

Main Results:

  • Achieving true tapping mode requires careful control over probe geometry, including small bending radius (approx. 0.3 mm) and short tip length, especially when using the second resonance mode.
  • Probes with specific characteristics were fabricated and demonstrated high quality factors (4000-6000) when attached to TF in double resonance.
  • For non-resonant excitation, a short freestanding probe beam length (not exceeding 3 mm) is necessary for tapping character.

Conclusions:

  • Realizing tapping mode feedback in SNOM with bent fiber probes demands precise engineering of probe geometry and excitation conditions.
  • The study provides guidelines for designing and utilizing bent fiber probes for effective tapping mode operation in SNOM.