Patents by Inventor Katsumi Furuya

Katsumi Furuya has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Photonic crystal coupling defect waveguide
    Patent number: 7440658
    Abstract: A photonic crystal directional coupler composed of at least two linear defect waveguides introduced into a photonic crystal. The medium constant and the lattice constant of the photonic crystal at the photonic crystal directional coupling part, the sizes and shapes of the elements constituting the periodical structure of the photonic crystal are varied. Thereby the difference in propagation constant between the even and odd modes of the photonic crystal directional coupling part is increased, thus shortening the coupling length of the photonic crystal directional coupler.
    Type: Grant
    Filed: March 1, 2005
    Date of Patent: October 21, 2008
    Assignees: Japan Science and Technology Agency, National Institute of Advanced Industrial Science and Technology
    Inventors: Katsumi Furuya, Kazuhiro Komori, Noritsugu Yamamoto, Yoshinori Watanabe
  • Photonic Crystal Coupling Defect Waveguide and Photonic Crystal
    Publication number: 20070280592
    Abstract: A photonic crystal directional coupler composed of at least two linear defect waveguides introduced into a photonic crystal. The medium constant and the lattice constant of the photonic crystal at the photonic crystal directional coupling part, the sizes and shapes of the elements constituting the periodical structure of the photonic crystal are varied. Thereby the difference in propagation constant between the even and odd modes of the photonic crystal directional coupling part is increased, thus shortening the coupling length of the photonic crystal directional coupler.
    Type: Application
    Filed: March 1, 2005
    Publication date: December 6, 2007
    Applicants: NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCI & TECH, Japan Science and Technology Agency
    Inventors: Katsumi Furuya, Kazuhiro Komori, Noritsugu Yamamoto, Yoshinori Watanabe