Also called AR coatings. Probably the most common type of coating, an anti-reflection
coating reduces the reflection (increases the transmission) of the surface
on which it is applied. AR coatings may be designed for any part of the
spectrum. It is possible to create high efficiency AR coatings (which reduce
the reflectance very close to zero for a narrow band of wavelengths), broadband AR
coatings, multiband AR coatings, etc.
The graphic below shows the performance of a 4-layer design that reduces the reflectance of glass from its usual value of about 4% down to less than 0.1%.
Here is another example of an AR coating:
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