Spiegel6 Spiegel2 Spiegel14
OptiLayer:  Your Partner in Design and Post-Production Characterization of Optical Coatings

 

 Bulk Inhomogeneity

Bulk Inhomogeneity model allows you to find the dependence of optical parameters on the thickness of a thin film. The study of the bulk inhomogeneity in the first, so-called Schroeder's approximation, allows the determination of the degree of inhomogeneity of a thin film. More exact approximations allow investigating the refractive index profile of a thin film. See more in our publications.

film inhomogeneity

inhomogeneous film Reflectance maxima (red) are shifted upwards from the bare substrate reflectance (black). It is known from the theory that such shifts are typical for thin films featuring bulk inhomogeneity.

inhomogeneous film

Intermediate fitting, obtained after application of Cauchy model, is not good, especially in the regions of reflectance maxima. There is nothing strange,  because the bulk inhomogeneity was not taken into account.

thin film inhomogeneity

Final fitting, obtained after application of thin film model with bulk inhomogeneity. The degree of inhomogeneity is 1.6%.

References

  1. A. V. Tikhonravov, M.K. Trubetskov, G. Clarke, B. T. Sullivan, J. A. Dobrowolski, Ellipsometric study of optical properties and small inhomogeneities of Nb2O5 films, Proc. SPIE. 3738, Advances in Optical Interference Coatings 183 (1999)
  2. A. V. Tikhonravov, M. K. Trubetskov, and A. V. Krasilnikova, "Spectroscopic ellipsometry of slightly inhomogeneous nonabsorbing thin films with arbitrary refractive-index profiles: theoretical study ," Appl. Opt. 37, 5902-5911 (1998)
  3. A. V. Tikhonravov, M. K. Trubetskov, B. T. Sullivan, and J. A. Dobrowolski, "Influence of small inhomogeneities on the spectral characteristics of single thin films ," Appl. Opt. 36, 7188-9198 (1997)

Easy to start

Icons 100x100 1OptiLayer provides user-friendly interface and a variety of examples allowing even a beginner to effectively start to design and characterize optical coatings.        Read more...

Docs / Support

Icons 100x100 2Comprehensive manual in PDF format and e-mail support help you at each step of your work with OptiLayer.

 

Advanced

Icons 100x100 3If you are already an experienced user, OptiLayer gives your almost unlimited opportunities in solving all problems arising in design-production chain. Visit our publications page and challenge page.

 

Go to top