Thermal-expansion effects in near-field optical microscopy fiber probes induced by laser light absorption

Year: 1999

Authors: Gucciardi P. G., Colocci M., Labardi M., Allegrini M.

Autors Affiliation: Ist Nazl Fis Mat, Dipartimento Fis & LENS, I-50125 Florence, Italy Ist Nazl Fis Mat, Dipartimento Fis, I-56127 Pisa, Italy

Abstract: We present a study on thermal-expansion effects induced by laser light coupling into metal-coated probes for near-field scanning optical microscopy. An expansion of the probe edge of 170 nm per mW of coupled power has been observed as an effect of the temperature raise due to light absorption in the metal coating. The phenomenon has been studied in both time and frequency domains by modulating the coupled laser power, in order to measure the typical time constants related to heat exchange processes, that turned out to be of the order of a few milliseconds. An analytical model, taking into account both the heat conduction through the coating and the convection losses, provides scales for the system parameters and fits the experimental data remarkably well. (C) 1999 American Institute of Physics.

Journal/Review: APPLIED PHYSICS LETTERS

Volume: 75 (21)      Pages from: 3408  to: 3410

KeyWords: tips; force;
DOI: 10.1063/1.125309

Citations: 28
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