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Biometamaterials: Black Ultrathin Gold Film Fabricated on Lotus Leaf.

Ebihara Y, Ota R, Noriki T, Shimojo M, Kajikawa K - Sci Rep (2015)

Bottom Line: 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.

View Article: PubMed Central - PubMed

Affiliation: Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Nagatsuta, Yokohama 226-8502, Japan.

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.

No MeSH data available.


(a) A flower and (b) leaves of lotus. (c) A model of surface nanostructure of a lotus leaf.
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f1: (a) A flower and (b) leaves of lotus. (c) A model of surface nanostructure of a lotus leaf.

Mentions: Lotus is an aquatic plant and its photographic images are shown in Fig. 1(a,b). The surface of a lotus leaf is highly water-repellent. This repellency derives from primary microscopic protuberances with nanoscale secondary roughness composed of wax crystalloids123. Many researches have focused on the fabrication of artificial super-hydrophobic and self-cleaning surfaces by mimicking the surface structure of lotus leaves45678910.


Biometamaterials: Black Ultrathin Gold Film Fabricated on Lotus Leaf.

Ebihara Y, Ota R, Noriki T, Shimojo M, Kajikawa K - Sci Rep (2015)

(a) A flower and (b) leaves of lotus. (c) A model of surface nanostructure of a lotus leaf.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4632130&req=5

f1: (a) A flower and (b) leaves of lotus. (c) A model of surface nanostructure of a lotus leaf.
Mentions: Lotus is an aquatic plant and its photographic images are shown in Fig. 1(a,b). The surface of a lotus leaf is highly water-repellent. This repellency derives from primary microscopic protuberances with nanoscale secondary roughness composed of wax crystalloids123. Many researches have focused on the fabrication of artificial super-hydrophobic and self-cleaning surfaces by mimicking the surface structure of lotus leaves45678910.

Bottom Line: 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.

View Article: PubMed Central - PubMed

Affiliation: Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Nagatsuta, Yokohama 226-8502, Japan.

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.

No MeSH data available.