Invited Article: Plasmonic growth of patterned metamaterials with fractal geometry

Nobuyuki Takeyasu, Natsuo Taguchi, Naoki Nishimura, Bo Han Cheng, Satoshi Kawata

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Large-scale metallic three-dimensional (3D) structures composed of sub-wavelength fine details, called metamaterials, have attracted optical scientists and materials scientists because of their unconventional and extraordinary optical properties that are not seen in nature. However, existing nano-fabrication technologies including two-photon fabrication, e-beam, focused ion-beam, and probe microscopy are not necessarily suitable for fabricating such large-scale 3D metallic nanostructures. In this article, we propose a different method of fabricating metamaterials, which is based on a bottom-up approach. We mimicked the generation of wood forest under the sunlight and rain in nature. In our method, a silver nano-forest is grown from the silver seeds (nanoparticles) placed on the glass substrate in silver-ion solution. The metallic nano-forest is formed only in the area where ultraviolet light is illuminated. The local temperature increases at nano-seeds and tips of nano-trees and their branches due to the plasmonic heating as a result of UV light excitation of localized mode of surface plasmon polaritons. We have made experiments of growth of metallic nano-forest patterned by the light distribution. The experimental results show a beautiful nano-forest made of silver with self-similarity. Fractal dimension and spectral response of the grown structure are discussed. The structures exhibit a broad spectral response from ultraviolet to infrared, which was used for surface-enhanced Raman detection of molecules.

Original languageEnglish
Article number050801
JournalAPL Photonics
Volume1
Issue number5
DOIs
Publication statusPublished - Aug 1 2016
Externally publishedYes

Fingerprint

Metamaterials
Fractals
fractals
Silver
silver
Geometry
geometry
Seed
spectral sensitivity
seeds
Focused ion beams
ion probes
Fractal dimension
Nanotechnology
Ultraviolet radiation
nanofabrication
Rain
rain
Nanostructures
sunlight

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Atomic and Molecular Physics, and Optics

Cite this

Invited Article : Plasmonic growth of patterned metamaterials with fractal geometry. / Takeyasu, Nobuyuki; Taguchi, Natsuo; Nishimura, Naoki; Cheng, Bo Han; Kawata, Satoshi.

In: APL Photonics, Vol. 1, No. 5, 050801, 01.08.2016.

Research output: Contribution to journalArticle

Takeyasu, Nobuyuki ; Taguchi, Natsuo ; Nishimura, Naoki ; Cheng, Bo Han ; Kawata, Satoshi. / Invited Article : Plasmonic growth of patterned metamaterials with fractal geometry. In: APL Photonics. 2016 ; Vol. 1, No. 5.
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