Patents by Inventor Matsafumi Nakada

Matsafumi Nakada 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).

  • Optical element for enhanced transmission of light and suppressed increase in temperature
    Patent number: 7154820
    Abstract: An optical element structure allowing an increased power density of aperture-transmitted light while suppressing increase in temperature is disclosed. A conductive film has a sub-wavelength aperture formed therein and a periodic surface topography formed thereon. A lens focuses light onto the periodic surface topography with a predetermined diameter. The predetermined diameter of incident light on the conductive film and a period of the periodic surface topography are determined so that a power ratio of aperture-transmitted light to the light beam is greater than that of aperture-transmitted light which would be obtained if no periodic surface topography is provided in the conductive film.
    Type: Grant
    Filed: January 6, 2003
    Date of Patent: December 26, 2006
    Assignee: NEC Corporation
    Inventors: Matsafumi Nakada, Tineke Thio