Picosecond transient thermoreflectance: A new probe of two-dimensional and quasi-two-dimensional structures

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Abstract

A nondestructive type of measurement, picosecond transient thermoreflectance, is proposed to determine cluster sizes, surface coverage, or the fractal dimension of light absorbing species of submonolayer coverage on surfaces and interfaces. The idea is to use a high-repetition-rate pump-and-probe technique of high dynamic range to excite the molecules on the surface selectively and to monitor the transient change of temperature through the change of reflectivity. It is shown that the range of transient reflectivity measurements is not limited by the wavelength of the probe beam, but the relaxation time of the species, and it may be in the nanometer range. An expression for the determination of the dimension of fractal structures is derived.

Original languageEnglish
Pages (from-to)2567-2570
Number of pages4
JournalJournal of Applied Physics
Volume67
Issue number5
DOIs
Publication statusPublished - Dec 1 1990

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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