Eur. Phys. J. Appl. Phys.
Volume 26, Number 1, April 2004
|Page(s)||45 - 52|
|Section||Imaging, Microscopy and Spectroscopy|
|Published online||22 March 2004|
Definition of a simple resolution criterion in an Apertureless Scanning Near-Field Optical Microscope (A-SNOM): contribution of the tip vibration and lock-in detection
Laboratoire de Nanotechnologie et d'Instrumentation
Optique, Université de Technologie de Troyes, 12 rue Marie Curie,
BP 2060, 10010 Troyes Cedex, France
Corresponding author: firstname.lastname@example.org
Revised: 8 January 2004
Accepted: 23 January 2004
Published online: 22 March 2004
A realistic near-field calculation on metallic hole samples in illumination transmission conditions predicts certain light confinements around the holes. The purpose of this paper is to explain theoretically how an A-SNOM (Apertureless Scanning Near-field Optical Microscope) is able to detect the light confinement around the holes, and how it is possible, by defining a criterion of separation between two holes in near-field, to analyse the resolution as a function of the experimental parameters. The modulation of the probe height in A-SNOM is used for both distance control and separation of the near-field from the background scattered light. A realistic model of lock-in detection is used to calculate the images of test samples. Constant height mode images are presented at different amplitudes of probe modulation and average heights of the tip. We also discuss the detection at different demodulation harmonics.
PACS: 07.79.Fc – Near-field scanning optical microscopes / 68.37.Uv – Near-field scanning microscopy and spectroscopy
© EDP Sciences, 2004
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