Thermal-expansion effects in near-field optical microscopy fiber probes induced by laser light absorption
Anno: 1999
Autori: Gucciardi P. G., Colocci M., Labardi M., Allegrini M.
Affiliazione autori: 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.
Giornale/Rivista: APPLIED PHYSICS LETTERS
Volume: 75 (21) Da Pagina: 3408 A: 3410
Parole chiavi: tips; force; DOI: 10.1063/1.125309Citazioni: 28dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-05-12Riferimenti tratti da Isi Web of Knowledge: (solo abbonati) Link per visualizzare la scheda su IsiWeb: Clicca quiLink per visualizzare la citazioni su IsiWeb: Clicca qui