Database of Optical Constants

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Comments

Optical constants or dielectric constants are not constant. They are a function of wavelength and physical states such as physical density, crystallinity, grain size and orientation, etc. The most obvious case is when you compare thin film with bulk materials. Therefore, it is critical to have your own materials measured under every condition to learn the true optical constants for the particular materials. The Database of Optical Constants (we also call it NK Database) established by us is only for your reference. It is a good idea to learn the general dispersion behaviors for materials, which in turn will help you develop optical models to study optical properties of the materials processed under your specific processing conditions. But if you directly apply these data to your design, you do it at your own risk. We recommend that you always measure optical properties by yourself. When you need help, we are here to provide Analytical Service with various Advanced Tools for such purpose.

In the near future, we'll update the measurement technique, dispersion expressions and principles here for a knowledge base. We hope this website become a starting point for most of the new comers in the ellipsometry field. If you have any comments or suggestions on our Database of Optical Constants, please feel free to let us know.