Focus on: Color Sensitivity
For broadband coatings in the visible part of the spectrum (wavelengths 380
to 780 nm), the color of reflected and/or transmitted light may be important.
As an example, consider anti-reflection coatings for eye glasses, which usually
have a green reflection. A four-layer coating can reduce the luminous reflectance
to 0.1% and have a reflected color of x=0.3, y=0.4. However, as the plot
below shows, if we have even a small manufacturing error, the color of the
reflected light varies considerably.|
In this type of coating, the reflected color is often more important than the reflectance. Hence, we may be able to tradeoff reflectance for more color stability. By using TFCalc's capability of optimizing sensitivity, the color sensitivity can be controlled, as shown below.
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