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Colour neutral antireflection coatings for strongly curved lenses using organic nanostructures as low-n template

: Munzert, P.; Knopf, H.; Rickelt, F.; Schulz, U.


Lequime, Michel (Ed.) ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Advances in Optical Thin Films VI : 14-17 May 2018, Frankfurt, Germany
Bellingham, WA: SPIE, 2018 (Proceedings of SPIE 10691)
ISBN: 978-1-5106-1919-7
ISBN: 978-1-5106-1920-3
Paper 106910Z, 6 pp.
Conference "Advances in Optical Thin Films" <6, 2018, Frankfurt>
Conference Paper
Fraunhofer IOF ()

To effectively improve color neutrality of antireflection (AR) coatings, a layer with a very low refractive index (n < 1,3) must be used as the top layer. However, solid materials with such a low refractive index (n) does not exist. The deposition of low molecule weight organic materials as compact films, and a subsequent plasma etching procedure on these films, offered the possibility to produce a nanostructured layer with a very low refractive index as top layer for an antireflection coating. Strongly curved aspheric lenses were coated with such a super-broadband AR design (ARplas2) and the antireflection performance was measured at different locations on the lens. An average reflection < 0,25 % over the full visible wavelength range was measured even in the outermost region of the curvature.