Open AccessDescription of near– and far–field light emitted from a metal–coated tapered fiber tip
Author(s) -
Tomasz J. Antosiewicz,
Tomasz Szoplik
Publication year - 2007
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.15.007845
Subject(s) - optics , finite difference time domain method , near and far field , dipole , electric field , cartesian coordinate system , physics , fiber , charge density , materials science , radiation , geometry , mathematics , quantum mechanics , composite material
We present an analytical calculation of near- and far-field radiation emitted from a metal-coated tapered fiber probe. From FDTD simulations made in Cartesian coordinates we find that charge distribution on a tip is rim localized and its density is a bipolar periodic and continuous function. Similar angular charge density distributions may result from random irregularities of tip surfaces created in the fabrication process. Thus forward emission from a tip can be described as emission of quasi-dipoles and multi-quasi-dipoles. Analytically calculated characteristics are in agreement with our FDTD simulations and previous measurements of Obermüller and Karrai.