Calculation of the temperature and thermal expansion of a STM tip heated by a short laser pulse |
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Authors: | PI Geshev S Klein K Dickmann |
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Institution: | (1) Institute of Thermophysics of the Russian Academy of Sciences, Lavrentyev Ave. 1, 630090 Novosibirsk, Russia, RU;(2) FH Münster, FB Physikalische Technik, Laserzentrum, Stegerwaldstr. 39, 48565 Steinfurt, Germany, DE |
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Abstract: | A mathematical model for the calculation of the temperature field in a scanning tunneling microscope (STM) tip under laser
illumination is developed. The duration of the laser pulse is a few nanoseconds or shorter. A Gaussian distribution of the
laser light intensity in time and space is assumed. Two different mechanisms of tip heating are taken into account: 1. due
to an enhanced electric field on the tip; 2. due to heating of the side surface of the tip by the focused spot of laser light.
An average tip temperature is calculated using the heat conductivity equation. The enhanced electric field on the tip is calculated
by the method of boundary integral equations.
Received: 20 August 2002 / Revised version: 4 December 2002 / Published online: 19 March 2003
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ID="*"Corresponding author. Fax: +49-2551/962-490, E-mail: sklein@fh-muenster.de |
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Keywords: | PACS: 02 42 25 Fx 44 10 +i |
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