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Symmetrical periods for antireflection coating of plastic optics

: Schulz, U.; Schallenberg, U.B.; Kaiser, N.


Applied optics 42 (2003), No.7, pp.1346-1351
ISSN: 0003-6935
ISSN: 1539-4522
ISSN: 1559-128X
Journal Article
Fraunhofer IOF ()
antireflection; deposition; fabrication

Plastic optical parts require antireflective as well as hard coatings. A novel design concept for coating plastics combines both functions. Symmetrical three-layer periods with a phase thickness of 3 /2 π are arranged in a multilayer to achieve a step-down refractive-index profile. It is shown mathematically that the equivalent index of symmetrical periods can be lower than the lowest refractive index of a material used in the design, if the phase thickness of the symmetrical period is set equal to 3 /2 π instead of the usual /2. The straightforward application of the concept to the design of antireflection coatings in general is demonstrated by example.