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This interference is between light reflected from different surfaces of a thin film; thus, the effect is known as thin-film interference. Its effects and applications are everywhere: in incredibly precise optical devices, anti-forgery measures, and in cameras and projectors. As described below, Katharine Burr Blodgett's pioneering invention of ...
Examples. The type of interference that occurs when light is reflected from a thin film is dependent upon the wavelength and angle of the incident light, the thickness of the film, the refractive indices of the material on either side of the film, and the index of the film medium.
This interference is between light reflected from different surfaces of a thin film; thus, the effect is known as thin-film interference. As we noted before, interference effects are most prominent when light interacts with something having a size similar to its wavelength.
Let's put together a series of diagrams that reveal step-by-step what happens in thin film interference. There are several circumstances possible, but we will choose a film that has a thickness of three wavelengths of the light (as measured within that film), and assume the light is coming from a medium with a lower index of refraction, while ...
The fringes are essentially constant thickness contours of the film. They can be used to map the irregularities in the film thickness and/or determine the film thickness. The Michelson Interferometer and the Fabry-Perot Interferometer are good examples of devices operating on this principle.
The phenomenon of thin-film interference occurs when a light wave is reflected off two surfaces at a distance equal to its wavelength. We witness varied coloured patterns as light waves reflecting off the top and bottom surfaces interfere with one another.
What causes thin film interference? Figure 2 shows how light reflected from the top and bottom surfaces of a film can interfere. Incident light is only partially reflected from the top surface of the film (ray 1). The remainder enters the film and is itself partially reflected from the bottom surface.
