Vectorial modeling of near-field imaging with uncoated fiber probes: transfer function and resolving power

Appl Opt. 2006 Dec 1;45(34):8739-47. doi: 10.1364/ao.45.008739.

Abstract

Using exact 3D vectorial simulations of radiation coupling into uncoated dielectric fiber probes, we calculate amplitude transfer functions for conical single-mode fiber tips at the light wavelength of 633 nm. The coupling efficiency of glass fiber tips is determined in a wide range of spatial frequencies of the incident radiation for opening angles varying from 30 degrees to 120 degrees . The resolution in near-field imaging with these tips is considered for field distributions limited in both direct and spatial-frequency space. The characteristics of the transfer functions describing the relation between probed optical fields and near-field images are analyzed in detail. The importance of utilizing a perfectly sharp tip is also examined.

MeSH terms

  • Computer Simulation
  • Computer-Aided Design*
  • Equipment Design
  • Equipment Failure Analysis
  • Fiber Optic Technology / instrumentation*
  • Image Enhancement / instrumentation*
  • Image Enhancement / methods
  • Image Interpretation, Computer-Assisted / instrumentation*
  • Image Interpretation, Computer-Assisted / methods
  • Microscopy / instrumentation*
  • Microscopy / methods*
  • Models, Theoretical*
  • Reproducibility of Results
  • Sensitivity and Specificity