Hi Everyone, I am trying to find the real and imaginary dielectric constants for TiO2 (rutile) as a function of wavelength. Could anyone suggest a good place to find something like this? Palik has a nice book but it is incomplete, so I'm not sure if there is something newer. Also, could someone help me sort out the difference between those dielectric constants and the single values that you sometimes find. (Like in the CRC) When is it appropriate to use one or the other? Also, I found a cool website that will calculate the ordinary and extraordinary ray- is this related or is it a different concept? Thanks for your help! PS- Also, I notice in Palik that they give values of n and k both parallel and perpendicular. For a FDTD calculation for trying to determine coupling with a metal nanoparticle, for example, what is more appropriate to use?