Centers & Labs

Associate Chief Scientist Laboratories

Metamaterials Laboratory

Associate Chief Scientist: Takuo Tanaka (D.Eng.)
Takuo  Tanaka(D.Eng.)

In the past, it has been believed that the electro-magnetic properties of materials are determined by the intrinsic property of the materials itself and no one can alter them. In this research laboratory, we are intensively investigating the breakthrough science and technologies that can artificially control the optical properties of the materials by using metal nano-structures. This technology can create unprecedented optical materials such that it can interact directly with the magnetic components of the light, in which the refractive index can be zero, negative or tremendously giant values. We collectively call these kinds of artificial materials - "metamaterials". We will also extend the application of metamaterials to develop novel and functional optical devices that will open a door for new photonic technologies.

Main Research Field

Engineering

Related Research Fields

Physics / Chemistry / Materials Sciences / Multidisciplinary

Research Subjects

  • Creation of optical metamaterials that work at visible light frequency region.
  • Application of plasmonic metamaterial technology to the optical functional devices.
  • Development of three-dimensional nano-scale metal fabrication techniques for 3D metamaterials.

Selected Publications

  1. Ishikawa, A., and Tanaka, T.:
    "Metamaterial Absorbers for Infrared Detection of Molecular Self-Assembled Monolayers"
    Scientific Reports 5, 12570 (2015).
  2. Amemiya, T., Ishikawa, A., Kanazawa, T., Kang, J., Nishiyama, N., Miyamoto, Y., Tanaka, T., and Arai, S.:
    "Permeability-controlled optical modulator with Tri-gate metamaterial: control of permeability on InP-based photonic integration platform"
    Scientific Reports 5, 8985 (2015).
  3. Tomioka, T., Kubo, S., Nakagawa, M., Hoga, M., and Tanaka, T.:
    "Split-Ring Resonators Interacting with a Magnetic Field at Visible Frequencies"
    Appl. Phys. Lett. 103, 71104 (2013)
  4. W-Tamaki, R., Ishikawa, A., Tanaka, T., Zako, T., and Maeda, M.:
    "DNA-Templating Mass Production of Gold Trimer Rings for Optical Metamaterials"
    The Journal of Physical Chemistry C 116, pp. 15028-15033 (2012)
  5. Kanna, A., Kentaro, F., and Takuo, T.:
    "Magnetic assembly of gold core-shell necklace resonators"
    Applied Physics Letters 100, 181106 (2012)
  6. Cao, Y., Takeyasu, N., Tanaka, T., Duan, X-M., and Kawata, S.:
    "3D Metallic Nano-Structure Fabrication By Surfactant-Assisted Multi-Photon-Induced Reduction"
    Small 5, pp. 1144-1148 (2009)
  7. Ishikawa, A., Tanaka, T., and Kawata, S.:
    "Magnetic Excitation of Magnetic Resonance in Metamaterials at Far-Infrared Frequencies"
    Appl. Phys. Lett. 91, 113118 (2007)
  8. Tanaka, T., Ishikawa, A., and Kawata, S.:
    "Unattenuated light transmission through the interface between two materials with different indices of refraction using magnetic metamaterials"
    Phys. Rev. B 73, 125423 (2006)
  9. Tanaka, T., Ishikawa, A., and Kawata, S.:
    "Two-photon-induced reduction of metal ions for fabricating three-dimensional electrically conductive metallic microstructure"
    Appl. Phys. Lett. 88, 81107 (2006)
  10. Ishikawa, A., Tanaka, T., and Kawata, S.:
    "Negative Magnetic Permeability in the Visible Light Region"
    Phys. Rev. Lett. 95, 237401 (2005)

Lab Members

Principal Investigator

Takuo Tanaka
Associate Chief Scientist

Core Members

Yukie Mino-Yokota
Special Postdoctoral Researcher
Renilkumar Mudachathi
Foreign Postdoctoral Researcher
Atsushi Ishikawa
Visiting Scientist
Tomohiro Amemiya
Visiting Scientist
Nobuyuki Takeyasu
Visiting Scientist
Wakana Kubo
Visiting Scientist

Contact information

2-1 Hirosawa, Wako, Saitama 351-0198, Japan

Email: t-tanaka [at] riken.jp

Related links

Recent research results

October 24, 2014: Press Release
Three-dimensional metamaterials with a natural bent

Annual research report