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Time-resolved Ellipsometry to Study Extreme Non-equilibrium Electron Dynamics in Nanostructured Semiconductors

Published online by Cambridge University Press:  11 July 2012

T. W. Roger  and
A. Kaplan
T. W. Roger
Affiliation:
Nanoscale Physics Research Laboratory, University of Birmingham, Edgbaston Park Road, Birmingham, B15 2TT
A. Kaplan
Affiliation:
Nanoscale Physics Research Laboratory, University of Birmingham, Edgbaston Park Road, Birmingham, B15 2TT
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Abstract

We present a femtosecond pump-probe ellipsometer operating over a spectral range of 1.4 – 1.7 eV with a ∼50fs time resolution. The calibration and preliminary findings of the setup are discussed. We tested the apparatus on bulk crystalline silicon (not shown here) and on silicon nanocrystals embedded in an amorphous silicon phase. The ellipsometric angles (ψ, Δ) were determined as a function of time and wavelength. The results suggest that a simple Drude model of free carrier absorption is not sufficient to explain the findings.

Keywords

nanoscaleSithin film

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