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Proceedings Paper

Imprinted and injection-molded nano-structured optical surfaces
Author(s): Alexander B. Christiansen; Emil Højlund-Nielsen; Jeppe Clausen; Gideon P. Caringal; N. Asger Mortensen; Anders Kristensen
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Paper Abstract

Inspired by nature, nano-textured surfaces have attracted much attention as a method to realize optical surface functionality. The moth-eye antireflective structure and the structural colors of Morpho butterflies are well- known examples used for inspiration for such biomimetic research. In this paper, nanostructured polymer surfaces suitable for up-scalable polymer replication methods, such as imprinting/embossing and injection-molding, are discussed. The limiting case of injection-moulding compatible designs is investigated. Anti-reflective polymer surfaces are realized by replication of Black Silicon (BSi) random nanostructure surfaces. The optical transmission at normal incidence is measured for wavelengths from 400 nm to 900 nm. For samples with optimized nanostructures, the reflectance is reduced by 50 % compared to samples with planar surfaces. The specular and diffusive reflection of light from polymer surfaces and their implication for creating structural colors is discussed. In the case of injection-moulding compatible designs, the maximum reflection of nano-scale textured surfaces cannot exceed the Fresnel reflection of a corresponding flat polymer surface, which is approx. 4 % for normal incidence. Diffraction gratings provide strong color reflection defined by the diffraction orders. However, the apperance varies strongly with viewing angles. Three different methods to address the strong angular-dependence of diffraction grating based structural color are discussed.

Paper Details

Date Published: 19 September 2013
PDF: 12 pages
Proc. SPIE 8818, Nanostructured Thin Films VI, 881803 (19 September 2013); doi: 10.1117/12.2025133
Show Author Affiliations
Alexander B. Christiansen, Technical Univ. of Denmark (Denmark)
Emil Højlund-Nielsen, Technical Univ. of Denmark (Denmark)
Jeppe Clausen, Technical Univ. of Denmark (Denmark)
Gideon P. Caringal, Technical Univ. of Denmark (Denmark)
N. Asger Mortensen, Technical Univ. of Denmark (Denmark)
Anders Kristensen, Technical Univ. of Denmark (Denmark)


Published in SPIE Proceedings Vol. 8818:
Nanostructured Thin Films VI
Tom G. Mackay; Akhlesh Lakhtakia; Yi-Jun Jen; Motofumi Suzuki, Editor(s)

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