Open AccessScanning optical near-field resolution analyzed in terms of communication modes
Author(s) -
Per-Gunnar Martinsson,
Hanna Lajunen,
Ari T. Friberg
Publication year - 2006
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.14.011392
Subject(s) - optics , near field scanning optical microscope , aperture (computer memory) , resolution (logic) , near and far field , physics , optical microscope , scanning electron microscope , computer science , acoustics , artificial intelligence
We present an analysis of scanning near-field optical microscopy in terms of the so-called communication modes using scalar wave theory. We show that the number of connected modes increases when the scanning distance is decreased, but the number of modes decreases when the size of the scanning aperture is decreased. In the limit of small detector aperture the best-connected mode reduces effectively to the Green function, evaluated at the center of the scanning aperture. We also suggest that the resolution of a scanning optical near-field imaging system is essentially given by the width of the lowest-order communication mode.