Patents by Inventor Seshadri Jagannathan

Seshadri Jagannathan 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).

  • Patent number: 5452123
    Abstract: Methods for making a nonlinear optical device and related devices are dissed. The method includes creating an ordered dispersion of charged particles in a surrounding medium. The charged particles and the surrounding medium are chosen such that they initially have identical refractive indices. In accordance with one aspect of the invention, cadmium sulfide inclusions are added to at least one of (a) the particles or (b) the medium. The cadmium sulfide inclusions have a highly nonlinear refractive index. The inclusions are optically nonlinear and upon high intensity radiation the refractive index of the particles change. This change in the refractive index occurs on the order of nanoseconds. In accordance with another aspect of the invention, a nonfluorescent dye is incorporated into at least one of (a) the particles or (b) the medium. The dye is photoabsorptive. Upon being impinged with high intensity radiation, the dye absorbs photons and heats the surrounding particles.
    Type: Grant
    Filed: December 30, 1992
    Date of Patent: September 19, 1995
    Assignee: University of Pittsburgh of the Commonwealth System of Higher Education
    Inventors: Sanford A. Asher, Song-Yuan Chang, Seshadri Jagannathan, Rasu Kesavamoorthy, Guisheng Pan