Classification and Characteristics of Optical Thin Films

Classification and Characteristics of Optical Thin Films

Optical thin films can be classified into reflective film, antireflective film/antireflective film, filter, polarizer/polarizer film, compensation film/phase difference plate, alignment film, diffusion film/film, brightening film/prism/concentrator, shading film/black-and-white adhesive, etc. The related derivatives include optical protective film, window film and so on.

The characteristics of optical thin films are as follows: smooth surface, geometric division of the interface between the film layers; the refractive index of the film can jump on the interface, but it is continuous in the film layer; it can be transparent medium or absorption medium; it can be normal uniform or normal inhomogeneous. The applied films are much more complex than the ideal ones. This is because: the optical and physical properties of the films deviate from the bulk materials, and the surface and interface are rough, which results in diffuse reflection of the light beam; the permeation between the film layers forms a diffusion interface; the anisotropy of the films is formed due to the growth, structure and stress of the film layers; and the time effect of the film is complex.

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