Patents by Inventor Alexei Koshelev

Alexei Koshelev 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).

  • Tunable terahertz radiation source
    Patent number: 8633472
    Abstract: Terahertz radiation source and method of producing terahertz radiation, said source comprising a junction stack, said junction stack comprising a crystalline material comprising a plurality of self-synchronized intrinsic Josephson junctions; an electrically conductive material in contact with two opposing sides of said crystalline material; and a substrate layer disposed upon at least a portion of both the crystalline material and the electrically-conductive material, wherein the crystalline material has a c-axis which is parallel to the substrate layer, and wherein the source emits at least 1 mW of power.
    Type: Grant
    Filed: September 14, 2009
    Date of Patent: January 21, 2014
    Assignee: Los Alamos National Security, LLC
    Inventors: Lev Boulaevskii, David M. Feldmann, Quanxi Jia, Alexei Koshelev, Nathan A. Moody
  • TUNABLE TERAHERTZ RADIATION SOURCE
    Publication number: 20110062423
    Abstract: Terahertz radiation source and method of producing terahertz radiation, said source comprising a junction stack, said junction stack comprising a crystalline material comprising a plurality of self-synchronized intrinsic Josephson junctions; an electrically conductive material in contact with two opposing sides of said crystalline material; and a substrate layer disposed upon at least a portion of both the crystalline material and the electrically-conductive material, wherein the crystalline material has a c-axis which is parallel to the substrate layer, and wherein the source emits at least 1 mW of power.
    Type: Application
    Filed: September 14, 2009
    Publication date: March 17, 2011
    Applicant: LOS ALAMOS NATIONAL SECURITY, LLC
    Inventors: Lev Boulaevskii, David M. Feldmann, Quanxi Jia, Alexei Koshelev, Nathan A. Moody
  • Tunable, superconducting, surface-emitting teraherz source
    Publication number: 20070244012
    Abstract: A compact, solid-state THz source based on the driven Josephson vortex lattice in a highly anisotropic superconductor such as Bi2Sr2CaCu2O8 that allows cw emission at tunable frequency. A second order metallic Bragg grating is used to achieve impedance matching and to induce surface emission of THz-radiation from a Bi2Sr2CaCu2O8 sample. Steering of the emitted THz beam is accomplished by tuning the Josephson vortex spacing around the grating period using a superimposed magnetic control field.
    Type: Application
    Filed: March 27, 2007
    Publication date: October 18, 2007
    Inventors: Ulrich Welp, Alexei Koshelev, Kenneth Gray, Wai-Kwong Kwok, Vitalii Vlasko-Vlasov