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

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.

An improved perfectly matched layer for the eigenmode expansion technique

“…For example, it has been used to determine mode profiles and threshold gain in Vertical-Cavity Surface-Emitting Lasers , to calculate transfer functions of the fiber tip of a scanning near-field optical microscope (Gregersen et al 2006), to calculate quality factors of micro pillars (Gregersen et al 2007) and to compute far field radiation patterns of nanowire-based single-photon sources (Gregersen et al 2008).…”

Polarization-dependent extraction properties of bare fiber probes

“…Recent studies have shown that bare fiber probes are mostly sensitive to the optical electric field, with little or no sensitivity to the optical magnetic field [3][4][5]. Although subwavelength-scale optics immediately implies strong local variations in the vector light orientation, only a few studies have been devoted to the coupling between vector electric fields and uncoated fiber probes.…”