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Wideband antireflection coatings by combining interference multilayers with structured top layers

: Schulz, U.

Postprint (695 KByte; PDF; )

Optics Express 17 (2009), Nr.11, S.8704-8708
ISSN: 1094-4087
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IOF ()
surface; performance; reflectance; design; film

The residual reflectance obtained for a broad wavelength range depends mainly on the refractive index of the last layer. Using interference layer stacks composed of naturally available low- and high-index materials, the residual reflection for a broad range cannot be adjusted below a certain limit. However, nanostructured (gradient) and porous layers are effective media with a refractive index lower than that of natural materials. Results demonstrate that an interference layer stack combined with a structured layer as the last layer yields better antireflection properties owing to the low effective index of the structure.