Patents by Inventor Alessandro Busacca

Alessandro Busacca 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).

  • Electric field poling of ferroelectric materials
    Patent number: 6952307
    Abstract: A method of inducing a periodic variation of nonlinearity in a sample of ferroelectric material, comprises applying an electrically insulting mask to surface of the sample, applying an electric field across the sample to produce domain inversion in the sample, and removing the electric field when non-inverted regions of the sample remain only in the vicinity of the surface of the sample beneath parts of the surface covered by the mask. This method can be used to engineer accurate domain periods of submicron dimensions or larger which are confined to a surface region of the ferroelectric material, so that the poled material can be used to fabricate planar waveguide devices for nonlinear optical applications. In particular, the submicron periods can be exploited in the fabrication of one and two-dimensional photonic band gap devices.
    Type: Grant
    Filed: June 26, 2002
    Date of Patent: October 4, 2005
    Assignee: University of Southampton
    Inventors: Vasilis Apostolopoulos, Alessandro Busacca, Sakellaris Mailis, Robert Eason
  • Electric field poling of ferroelectric materials
    Publication number: 20040207903
    Abstract: A method of inducing a periodic variation of nonlinearity in a sample of ferroelectric material, comprises applying an electrically insulting mask to surface of the sample, applying an electric field across the sample to produce domain inversion in the sample, and removing the electric field when non-inverted regions of the sample remain only in the vicinity of the surface of the sample beneath parts of the surface covered by the mask. This method can be used to engineer accurate domain periods of submicron dimensions or larger which are confined to a surface region of the ferroelectric material, so that the poled material can be used to fabricate planar waveguide devices for nonlinear optical applications. In particular, the submicron periods can be exploited in the fabrication of one and two-dimensional photonic band gap devices.
    Type: Application
    Filed: May 26, 2004
    Publication date: October 21, 2004
    Inventors: Vasilis Apostolopoulos, Alessandro Busacca, Sakellaris Maillis, Robert Eason