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    Jalkanen, Tero Salonen, Jarno Torres-Costa, Vicente Fukami, Kazuhiro Sakka, Tetsuo and Ogata, Yukio H. 2011. Structural considerations on multistopband mesoporous silicon rugate filters prepared for gas sensing purposes. Optics Express, Vol. 19, Issue. 14, p. 13291.

    Kompan, M. E. Salonen, J. and Shabanov, I. Yu. 2000. Anomalous birefringence of light in free-standing samples of porous silicon. Journal of Experimental and Theoretical Physics, Vol. 90, Issue. 2, p. 324.

    Salonen, J. Lehto, V-P. and Laine, E. 1999. Photo-oxidation studies of porous silicon using a microcalorimetric method. Journal of Applied Physics, Vol. 86, Issue. 10, p. 5888.


Dispersive Fourier Transform Spectroscopy Of Free-Standing Porous Silicon Films

  • J. Salonen (a1), K. Saarinen (a1), J. Peura (a1), J. Vilnikanoja (a1), I. Salomaa (a1), E. Laine (a1) and J Kauppinen (a1)
  • DOI:
  • Published online: 01 February 2011

We have investigated optical constants of free-standing porous silicon films by dispersive Fourier transform spectroscopy (DFTS) in the NIR-VIS range. This allows the spectral variation of both the absorption coefficient and the refractive index of a material to be determined from the measurements of the attenuation and phase shift imposed on an electromagnetic wave by its interaction with a specimen. Using these optical constants, we have studied the complex dielectric function and the complex conductivity. To avoid the additive error in the absorption spectra arising from the pseudocoherence, we measured the transmission spectra by conventional Fourier transform spectroscopy (FTS). Using the refraction spectrum derived from the DFTS measurements, we have corrected for reflection losses in calculation of the absorption spectrum from the FTS transmission spectrum. The changes in the absorption coefficient and the refractive index due to oxidation, which is the most common aging phenomenon in porous silicon, have been studied using samples with different types of oxidization.

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