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Abrasion resistant antireflection coating for plastics

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


Fulton, M.L. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Optical and Infrared Thin Films
Bellingham/Wash.: SPIE, 2000 (SPIE Proceedings Series 4094)
ISBN: 0-8194-3739-5
Conference Optical and Infrared Thin Films <2000, San Diego/Calif.>
Conference Paper
Fraunhofer IOF ()

Coating of plastics for optical applications is mostly intended to improve their mechanically durability and to provide a desired optical function. A potential layer system to realize an antireflection function and to improve the mechanical properties simultaneously in a combination of hard coating SiO2 with classical 4-layer antireflection system consisting of SiO2 and Ta2O5. Plasma-Ion Assisted Deposition (Plasma-IAD) at room temperature has been applied for coating experiments on PMMA and Polycarbonate. The temperature on a polymer substrate can reach a critical value in respect to its low thermal stability, if thick layers Ta2O5 have to be deposited. The increase of temperature is mainly determined by the radiation heat of electron beam evaporator. With needle optimization, an alternative coating design has been developed. The design is characterized by low thickness of high refractive index layers, which add up to less than about 5% of the to tal multilayer thickness. The high refractive index layers are almost evenly distributed over the whole stack. The total thickness of this kind of coating is adjustable between 800 nm and about 2600 nm. The mechanical properties of the coating deposited on plastics corresponds to that of a single SiO2 laser of the same thickness.