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Chief Scientist Laboratories Metamaterials Laboratory

Chief Scientist: Takuo Tanaka (D.Eng.)

Research Summary

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 Fields

  • Engineering

Related Research Fields

  • Interdisciplinary Science & Engineering
  • Optical engineering, Photon science
  • Nanomaterials engineering


  • Metamaterials
  • Nanophotonics
  • Plasmonics
  • Applied Optics

Selected Publications

  • 1.Yokota, Y., Ueno, K., Misawa, H., and Tanaka T.:
    "Spectroscopic Properties of Gold Curvilinear Nanorod Arrays,"
    Photonics 3, 18 (2016).
  • 2.Abumazwed, A., Kubo, W., Shen, C., Tanaka, T., and Kirk A. G.:
    "Projection method for improving signal to noise ratio of localized surface plasmon resonance biosensors"
    Biomedical Optics Express 8, 1, pp. 446-459 (2016).
  • 3.Ishikawa, A., and Tanaka, T.:
    "Metamaterial Absorbers for Infrared Detection of Molecular Self-Assembled Monolayers"
    Scientific Reports 5, 12570 (2015).
  • 4.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).
  • 5.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)
  • 6.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)
  • 7.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)
  • 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)

Annual research report

Related Links

Lab Members

Principal investigator

Takuo Tanaka
Chief Scientist

Core members

Daiki Kawasaki
Special Postdoctoral Researcher
Yuki Takeuchi
JSPS PD Researcher
Kentaro Ito
Student Trainee
Asuka Otani
Student Trainee
Keishi Kitamura
Student Trainee
Koki Takahashi
Student Trainee
Takaaki Yano
Senior Visiting Scientist
Tamotsu Zako
Senior Visiting Scientist
Nobuyuki Takeyasu
Visiting Scientist
Ryo Kato
Visiting Scientist
Noriho Kamiya
Visiting Scientist
Shunsuke Tomita
Visiting Scientist
Che-Chin Chen
Visiting Scientist
Renilkumar Mudachathi
Visiting Scientist

Contact Information

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

Email: t-tanaka [at] riken.jp