title: Pyrolytic carbon coated black silicon.
abstract: Carbon is the most well-known black material in the history of man. Throughout the centuries, carbon has been used as a black material for paintings, camouflage, and optics. Although, the techniques to make other black surfaces have evolved and become more sophisticated with time, carbon still remains one of the best black materials. Another well-known black surface is black silicon, reflecting less than 0.5% of incident light in visible spectral range but becomes a highly reflecting surface in wavelengths above 1000 nm. On the other hand, carbon absorbs at those and longer wavelengths. Thus, it is possible to combine black silicon with carbon to create an artificial material with very low reflectivity over a wide spectral range. Here we report our results on coating conformally black silicon substrate with amorphous pyrolytic carbon. We present a superior black surface with reflectance of light less than 0.5% in the spectral range of 350 nm to 2000 nm.
authors.affiliation: Department of Micro and Nanosciences, Aalto University, Espoo, P.O. Box 13500, FI-00076, Finland.
authors.forename: Ali
authors.initials: A
authors.lastname: Shah
authors.affiliation: Institute of Photonics, University of Eastern Finland, Joensuu, P.O. Box 111, FI-80101, Finland.
authors.forename: Petri
authors.initials: P
authors.lastname: Stenberg
authors.affiliation: Department of Micro and Nanosciences, Aalto University, Espoo, P.O. Box 13500, FI-00076, Finland.
authors.forename: Lasse
authors.initials: L
authors.lastname: Karvonen
authors.affiliation: Institute of Photonics, University of Eastern Finland, Joensuu, P.O. Box 111, FI-80101, Finland.
authors.forename: Rizwan
authors.initials: R
authors.lastname: Ali
authors.affiliation: Institute of Photonics, University of Eastern Finland, Joensuu, P.O. Box 111, FI-80101, Finland.
authors.forename: Seppo
authors.initials: S
authors.lastname: Honkanen
authors.affiliation: Department of Micro and Nanosciences, Aalto University, Espoo, P.O. Box 13500, FI-00076, Finland.
authors.forename: Harri
authors.initials: H
authors.lastname: Lipsanen
authors.affiliation: Department of Micro and Nanosciences, Aalto University, Espoo, P.O. Box 13500, FI-00076, Finland.|Institute of Photonics, University of Eastern Finland, Joensuu, P.O. Box 111, FI-80101, Finland.|College of Optical Sciences, University of Arizona, 1630 E. University Blvd, Tucson, AZ 85721, USA.
authors.forename: N
authors.initials: N
authors.lastname: Peyghambarian
authors.affiliation: Institute of Photonics, University of Eastern Finland, Joensuu, P.O. Box 111, FI-80101, Finland.
authors.forename: Markku
authors.initials: M
authors.lastname: Kuittinen
authors.affiliation: Institute of Photonics, University of Eastern Finland, Joensuu, P.O. Box 111, FI-80101, Finland.
authors.forename: Yuri
authors.initials: Y
authors.lastname: Svirko
authors.affiliation: Institute of Photonics, University of Eastern Finland, Joensuu, P.O. Box 111, FI-80101, Finland.
authors.forename: Tommi
authors.initials: T
authors.lastname: Kaplas