Special Section on Nanostructured Thin Films: Latest Developments in Theory and Practice

Angle-independent structural colors of silicon

[+] Author Affiliations
Emil Højlund-Nielsen

Technical University of Denmark, DTU Nanotech, Ørsteds Plads, Building 345E, DK-2800 Kgs. Lyngby, Denmark

Johannes Weirich

DFM A/S, Matematiktorvet 307, DK-2800 Kgs. Lyngby, Denmark

Jesper Nørregaard

NIL Technology ApS, Diplomvej 381, DK-2800 Kgs. Lyngby, Denmark

Joergen Garnaes

DFM A/S, Matematiktorvet 307, DK-2800 Kgs. Lyngby, Denmark

N. Asger Mortensen

Technical University of Denmark, DTU Fotonik, Ørsteds Plads, Building 343, DK-2800 Kgs. Lyngby, Denmark

Anders Kristensen

Technical University of Denmark, DTU Nanotech, Ørsteds Plads, Building 345E, DK-2800 Kgs. Lyngby, Denmark

J. Nanophoton. 8(1), 083988 (May 13, 2014). doi:10.1117/1.JNP.8.083988
History: Received December 1, 2013; Revised April 2, 2014; Accepted April 2, 2014
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Abstract.  Structural colors are optical phenomena of physical origin, where microscale and nanoscale structures determine the reflected spectrum of light. Artificial structural colors have been realized within recent years. However, multilayer structures require substantial fabrication. Instead we considered one-layer surface textures of silicon. We explored four patterns of square structures in a square lattice with periods of 500, 400, 300, and 200 nm. The reflectivity and daylight-colors were measured and compared with simulations based on rigorously coupled-wave analysis with excellent agreement. Based on the 200-nm periodic pattern, it was found that angle-independent specular colors up to 60 deg of incidence may be provided. The underlying mechanisms include (1) the suppression of diffraction and (2) a strong coupling of light to localized surface states. The strong coupling yields absorption anomalies in the visual spectrum, causing robust colors to be defined for a large angular interval. The result is a manifestation of a uniformly defined color, similar to pigment-based colors. These mechanisms hold potential for color engineering and can be used to explain and predict the structural-color appearance of silicon-based textures for a wide range of structural parameters.

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© 2014 Society of Photo-Optical Instrumentation Engineers

Citation

Emil Højlund-Nielsen ; Johannes Weirich ; Jesper Nørregaard ; Joergen Garnaes ; N. Asger Mortensen, et al.
"Angle-independent structural colors of silicon", J. Nanophoton. 8(1), 083988 (May 13, 2014). ; http://dx.doi.org/10.1117/1.JNP.8.083988


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