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Abstract
We show that cheap large area color filters, based on surface scattering, can be fabricated in dielectric materials by replication of random structures in silicon. The specular transmittance of three different types of structures, corresponding to three different colors, have been characterized. The angle resolved scattering has been measured and compared to predictions based on the measured surface topography and by the use of non-paraxial scalar diffraction theory. From this it is shown that the color of the transmitted light can be predicted from the topography of the randomly textured surfaces.
Highlights
Nature has demonstrated optical effects such as antireflection and colors based on micro and nanostructures
We show that cheap large area color filters, based on surface scattering, can be fabricated in dielectric materials by replication of random structures in silicon
The angle resolved scattering has been measured and compared to predictions based on the measured surface topography and by the use of non-paraxial scalar diffraction theory
Summary
Nature has demonstrated optical effects such as antireflection and colors based on micro and nanostructures. Such devices have been proposed that are based on either sub-wavelength one dimensional gratings [4,5,6,7] or nano-holes in metal surfaces that rely on plasmon enhanced propagation [8, 9]. These filters are all multi-material devices, and require several process steps to fabricate. The replication process can be done by the use of an electroplated mold followed by hot embossing [12] or by casting a soft elastomeric mold from the master and subsequently use it for hot embossing or UV-nano imprint lithograpy (UV-NIL) [13, 14]
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