Effect of composition on optical constants of Pb: GeSbTe chalcogenide thin films

J. Kumar, P. Kumar, N. Suri, M. Ahmad, R. Thangaraj, T. Stephen Sathiaraj

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Abstract

Optical properties of Pb doped ternary Ge-Sb-Te chalcognide films prepared by thermal evaporation have been studied in the visible and near-infrared spectral regions. The straightforward analysis proposed by Swanepoel has been successfully employed and it has allowed us to accurately determine the refractive index and extinction coefficient of the films. The refractive index has been determined from the upper and lower envelopes of the transmission spectra. The absorption coefficient and extinction coefficient have been determined from the transmission spectra in the strong-absorption region. The dispersion of the refractive index is discussed in terms of the Wemple-DiDomenico single oscillator model.

Original languageEnglish
Pages (from-to)635-639
Number of pages5
JournalOptoelectronics and Advanced Materials, Rapid Communications
Volume2
Issue number10
Publication statusPublished - Oct 1 2008

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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