9/18/2023 0 Comments Multilayer reflection calculator![]() Few layer pairs are sufficient in some cases, whereas more than 100 layers are required in other cases. The number of thin-film layers required depends very much on the required function and on the refractive index difference between the coating materials. tailored chromatic dispersion properties (see the article on dispersive mirrors).long-pass filters, high-pass filters, band-pass filters special polarization properties (for non-normal incidence): thin-film polarizers, polarizing and non-polarizing beam splitters.a combination of desirable reflectance values in different wavelength ranges.More complicated multilayer structure designs can be used to obtain certain functions, such as for example The higher the refractive index contrast of the used layer materials, the smaller is the number of layer pairs required for a high reflectance, and the higher will be the reflection bandwidth. It is also possible to design dichroic mirrors with controlled properties for different wavelengths. ![]() That design leads to the highest possible reflectance for a given number of layer pairs and given materials (assuming normal incidence). The simplest and most common design is that of a Bragg mirror, where all optical layer thickness values are just one-quarter of the design wavelength. ![]() Even if the Fresnel reflection coefficient from a single interface between two materials is small (due to a small difference in refractive indices), the reflections from many interfaces can (in a certain wavelength range) constructively interfere to result in a very high overall reflectance ( reflectivity) of the device. How to cite the article suggest additional literatureĪ dielectric mirror is a mirror based on multiple thin layers of (usually two) different transparent dielectric optical materials (→ dielectric coatings, thin-film coatings, interference coatings). More specific terms: Bragg mirrors, quarter-wave mirrors, dichroic mirrors, dispersive mirrors, chirped mirrors, cold mirrors, hot mirrors, supermirrors Definition: mirrors consisting of multiple thin layers of different transparent optical materials ![]()
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