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David Nečas, Ivan Ohlídal, Daniel Franta

Variable-angle spectroscopic ellipsometry of considerably non-uniform thin films

Journal of Optics 13 (2011) 085705

A theoretical approach for including considerable thickness non-uniformity of thin films into the formulae employed within variable-angle spectroscopic ellipsometry is presented. It is based on a combination of the efficient formulae derived for the thickness distribution density corresponding to a wedge-shaped non-uniformity with dependences of the mean thickness and root mean square (rms) of thickness differences on the angle of incidence that take into account the real non-uniformity of the shape. These dependences are derived using momentum expansion of the thickness distribution density. The derived formulae are tested by means of numerical analysis. An application of this approach is illustrated using the optical characterization of a selected sample of non-uniform SiOxCyHz thin films using phase-modulated ellipsometry.

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DOI: 10.1088/2040-8978/13/8/085705

You can also contact one of the authors: yeti@physics.muni.cz, ohlidal@physics.muni.cz, franta@physics.muni.cz

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Cited Articles

  1. Nečas D., Franta D., Buršíková V., Ohlídal I.,
    Ellipsometric characterisation of thin films non-uniform in thickness,
    Thin Solid Films 519 (2011) 2715-2717
  2. Ohlídal I., Ohlídal M., Nečas D., Franta D., Buršíková V.,
    Optical characterisation of SiOxCyHz thin films non-uniform in thickness using spectroscopic ellipsometry, spectroscopic reflectometry and spectroscopic imaging reflectometry,
    Thin Solid Films 519 (2011) 2874-2876
  3. Ohlídal I., Nečas D., Franta D., Buršíková V.,
    Characterization of non-uniform diamond-like carbon films by spectroscopic ellipsometry,
    Diamond and Related Materials 18 (2009) 364–367
  4. Nečas D., Ohlídal I., Franta D.,
    The reflectance of non-uniform thin films,
    Journal of Optics A: Pure and Applied Optics 11 (2009) 045202
  5. Franta D., Nečas D., Zajíčková L.,
    Models of dielectric response in disordered solids,
    Optics Express 15 (2007) 16230–16244