title: Biometamaterials: Black Ultrathin Gold Film Fabricated on Lotus Leaf.
abstract: We report on a black metamaterial of gold fabricated on a lotus leaf that was used as a template. In spite of the extremely thin gold coating (10-nm thick) on the lotus leaf, the surface shows reflectivity below 0.01 over the entire visible spectral range. Finite-difference time-domain (FDTD) calculations suggest that the low reflectivity stems from the secondary structures on the lotus leaf, where randomly oriented nanorods are distributed.
authors.affiliation: Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Nagatsuta, Yokohama 226-8502, Japan.
authors.forename: Yuusuke
authors.initials: Y
authors.lastname: Ebihara
authors.affiliation: Department of Materials Science and Engineering, Shibaura Institute of Technology, Koto, Tokyo 135-8548, Japan.
authors.forename: Ryoichi
authors.initials: R
authors.lastname: Ota
authors.affiliation: Department of Materials Science and Engineering, Shibaura Institute of Technology, Koto, Tokyo 135-8548, Japan.
authors.forename: Takahiro
authors.initials: T
authors.lastname: Noriki
authors.affiliation: Department of Materials Science and Engineering, Shibaura Institute of Technology, Koto, Tokyo 135-8548, Japan.
authors.forename: Masayuki
authors.initials: M
authors.lastname: Shimojo
authors.affiliation: Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Nagatsuta, Yokohama 226-8502, Japan.
authors.forename: Kotaro
authors.initials: K
authors.lastname: Kajikawa
mesh_terms: D006046:Gold / Q000737:chemistry*; D000070116:Lotus; D008855:Microscopy, Electron, Scanning; D043942:Nanotubes / Q000737:chemistry*; D010710:Phosphates / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry*; D013499:Surface Properties
chemical_list: C121848:Black-Gold; D010710:Phosphates; D006046:Gold