Studies on superprism effects in multilayer thin film stacks

The concept of "Superprism" which is used in photonic crystal will be introduced into optical thin film coatings, due to the fact that the group velocity of the light is different as the wavelength in certain special case for the multiplayer thin film coatings. In this paper, The "superprism" effect of multilayer thin film coatings will be presented both from theoretical analysis and experimental results, these researches will create an new application of the thin film coatings not only to be a spectral filter but also can acts as "thin film gratings".