Patents by Inventor Romuald Houdre

Romuald Houdre 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).

  • Optoelectronic Semiconductor Chip
    Publication number: 20110297982
    Abstract: A semiconductor chip is specified, comprising an active layer provided for emitting an electromagnetic radiation, and a two-dimensional arrangement of structural units, which is disposed downstream of the active layer in a main emission direction of the semiconductor chip. The structural units are arranged in an arbitrary statistical distribution. Such an arrangement of structural units makes it possible to realize a semiconductor chip having a directional emission characteristic.
    Type: Application
    Filed: July 23, 2009
    Publication date: December 8, 2011
    Inventors: Norbert Linder, Ralph Wirth, Christopher Wiesmann, Ross Stanley, Romuald Houdre
  • Semiconductor laser having a structure of photonic bandgap material
    Patent number: 5684817
    Abstract: Disclosed is a semiconductor laser that is constituted by at least one active layer sandwiched between two confinement layers with P and N type doping to constitute a PN junction. In at least one of the confinement layers and/or the active layer, holes are designed on each side of the cavity so as to form structures of photonic bandgap material along the lateral walls of the cavity and the ends of the cavity.
    Type: Grant
    Filed: May 1, 1996
    Date of Patent: November 4, 1997
    Assignee: Thomson-CSF
    Inventors: Romuald Houdre, Claude Weisbuch, Vincent Berger