Refractive index and extinction coefficient determination of an absorbing thin film by using the continuous wavelet transform method


APPLIED OPTICS, vol.47, no.27, pp.4888-4894, 2008 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 47 Issue: 27
  • Publication Date: 2008
  • Doi Number: 10.1364/ao.47.004888
  • Journal Name: APPLIED OPTICS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.4888-4894
  • Çanakkale Onsekiz Mart University Affiliated: Yes


We present the continuous wavelet transform (CWT) method for determining the dispersion curves of the refractive index and extinction coefficient of absorbing thin films by using the transmittance spectrum in the visible and near infrared regions at room temperature. The CWT method is performed on the transmittance spectrum of an a - Si1-xCx:H film, and the refractive index and extinction coefficient of the film are continuously determined and compared with the results of the envelope and fringe counting methods. Also the noise filter property of the method is depicted on a theoretically generated noisy signal. Finally, the error analyses of the CWT, envelope, and fringe counting methods are performed. (C) 2008 Optical Society of America