Validity of Swanepoel's Method for Calculating the Optical Constants of Thick Films
E.R. Shaaban; E. G. El-Metwally; Prof. Dr. Ibrahim Hussein (I.S. Yahia);
Abstract
Optical constants, dispersion and oscillator parameters of di erent thicknesses of amorphous Ge25Cd5Se70
lms have been deposited onto glass substrates using thermal evaporation technique. The optical constants
have been investigated by optical spectrophotometry measurements. The straight forward analysis proposed by
Swanepoel, which is based on the use of the extremes of the interference fringes has been used in order to derive
the refractive index and the lm thickness in m range. The refractive index could be extrapolated by the Cauchy
dispersion relationship over the whole spectral range, which extended from 400 to 2500 nm. It is observed that,
refractive index n increases with the lm thickness. The possible optical transition is found to be allowed indirect
transition with energy gap increase from 1.915 to 1.975 eV with increasing lm thickness. The dispersion of the
refractive index is discussed in terms of the Wemple DiDomenico single oscillator model. The interband oscillator
wavelength, the average oscillator strength, and the optical conductivity were estimated for di erent thicknesses
of amorphous Ge25Cd5Se70 lms.
lms have been deposited onto glass substrates using thermal evaporation technique. The optical constants
have been investigated by optical spectrophotometry measurements. The straight forward analysis proposed by
Swanepoel, which is based on the use of the extremes of the interference fringes has been used in order to derive
the refractive index and the lm thickness in m range. The refractive index could be extrapolated by the Cauchy
dispersion relationship over the whole spectral range, which extended from 400 to 2500 nm. It is observed that,
refractive index n increases with the lm thickness. The possible optical transition is found to be allowed indirect
transition with energy gap increase from 1.915 to 1.975 eV with increasing lm thickness. The dispersion of the
refractive index is discussed in terms of the Wemple DiDomenico single oscillator model. The interband oscillator
wavelength, the average oscillator strength, and the optical conductivity were estimated for di erent thicknesses
of amorphous Ge25Cd5Se70 lms.
Other data
Title | Validity of Swanepoel's Method for Calculating the Optical Constants of Thick Films | Authors | E.R. Shaaban; E. G. El-Metwally ; Prof. Dr. Ibrahim Hussein (I.S. Yahia) | Issue Date | 2012 | Journal | Acta Physica Polonica A | Volume | 121 | Start page | 628 | End page | 635 | ISSN | 0587-4246 1898-794X |
DOI | 10.12693/APhysPolA.121.628 |
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