Elimination of interference effects from photoinduced-transmission decay curves of thin silicon films

M. Kubinyi, Ric Allott, A. Grofcsik, W. Jeremy Jones

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The effects of interference on the photoinduced-absorption signals of thin absorbing films have been studied by recording the picosecond photoinduced-absorption decay curves of an amorphous and a polycrystalline silicon film and applying various probe-beam wavelengths and angles of incidence. The normalized decay curves measured at close to normal incidence have been found to depend strongly on the probe-beam wavelength. By contrast the decay curves obtained at the Brewster angle of incidence have shown a satisfactory coincidence. Theoretical calculations for the photoinduced changes of the transmittance of the film have been performed. These calculations prove that at normal incidence the contributions of the photoinduced changes of the absorption coefficient Δα and of the refractive index Δn to the change in the transmittance ΔT are comparable, whereas when the Brewster angle arrangement is employed, ΔT is proportional to Δα and the effect of the change in the refractive index is negligible.

Original languageEnglish
Pages (from-to)2949-2954
Number of pages6
JournalApplied Optics
Volume34
Issue number16
DOIs
Publication statusPublished - Jun 1 1995

Fingerprint

silicon films
elimination
incidence
interference
Silicon
Brewster angle
Refractive index
decay
curves
Wavelength
transmittance
refractivity
Polysilicon
probes
wavelengths
absorptivity
recording
thin films

Keywords

  • Amorphous silicon
  • Interference in thin films
  • Picosecond photoinduced absorption
  • Polycrystalline silicon

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Elimination of interference effects from photoinduced-transmission decay curves of thin silicon films. / Kubinyi, M.; Allott, Ric; Grofcsik, A.; Jeremy Jones, W.

In: Applied Optics, Vol. 34, No. 16, 01.06.1995, p. 2949-2954.

Research output: Contribution to journalArticle

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