Angle-independent structural colors of silicon

Research output: Contribution to journalJournal article – Annual report year: 2014Researchpeer-review

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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 coupledwave 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.
Original languageEnglish
JournalJournal of Nanophotonics
Issue number1
Pages (from-to)083988
Number of pages9
Publication statusPublished - 2014
CitationsWeb of Science® Times Cited: No match on DOI

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