Patents by Inventor Francesca Cavallo

Francesca Cavallo 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).

  • Publication number: 20210099142
    Abstract: Traveling-wave tube amplifiers for high-frequency signals, including terahertz signals, and methods for making a slow-wave structure for the traveling-wave tube amplifiers are provided. The slow-wave structures include helical conductors that are self-assembled via the release and relaxation of strained films from a sacrificial growth substrate.
    Type: Application
    Filed: October 1, 2019
    Publication date: April 1, 2021
    Inventors: Max G. Lagally, Matthew McLean Dwyer, Francesca Cavallo, Daniel Warren van der Weide, Abhishek Bhat
  • Patent number: 10930490
    Abstract: Methods for fabricating thin, high-aspect-ratio Ge nanostructures from high-quality, single-crystalline Ge substrates are provided. Also provided are grating structures made using the methods. The methods utilize a thin layer of graphene between a surface of a Ge substrate, and an overlying resist layer. The graphene passivates the surface, preventing the formation of water-soluble native Ge oxides that can result in the lift-off of the resist during the development of the resist.
    Type: Grant
    Filed: December 26, 2019
    Date of Patent: February 23, 2021
    Assignees: Wisconsin Alumni Research Foundation, The Regents of the University of New Mexico
    Inventors: Max G. Lagally, Francesca Cavallo, Vijay Saradhi Mangu
  • Patent number: 10903035
    Abstract: A self-assembling element fabricated using integrated circuit techniques may provide a small diameter helical conductor surrounding an electron beam for the construction of a vacuum electronic device such as a traveling-wave tube for terahertz scale signal.
    Type: Grant
    Filed: March 12, 2018
    Date of Patent: January 26, 2021
    Assignee: Wisconsin Alumni Research Foundation
    Inventors: Daniel W. van der Weide, Max Lagally, Francesca Cavallo
  • Patent number: 10680129
    Abstract: A solar cell for collecting solar radiation can include a barrier layer such as a dielectric barrier layer and a heterostructure including a first light absorbing layer and at least a second light absorbing layer. A method for forming the solar cell can include forming a sacrificial layer on a support substrate and forming the barrier layer on the sacrificial layer. The barrier layer is formed to have a strain gradient through its thickness. The heterostructure is attached to the barrier layer and the sacrificial layer is removed, thereby separating the barrier layer and the heterostructure from the support substrate. During the removal of the sacrificial layer, the strain gradient causes the barrier layer and heterostructure, to roll, curl, or spiral, thereby resulting in a radially stacked heterostructure that provides a light concentrating optical cavity having multiple light absorbing layers with different band gaps.
    Type: Grant
    Filed: October 5, 2018
    Date of Patent: June 9, 2020
    Assignee: STC.UNM
    Inventors: Francesca Cavallo, Vijay Saradhi Mangu
  • Publication number: 20190279834
    Abstract: A self-assembling element fabricated using integrated circuit techniques may provide a small diameter helical conductor surrounding an electron beam for the construction of a vacuum electronic device such as a traveling-wave tube for terahertz scale signal.
    Type: Application
    Filed: March 12, 2018
    Publication date: September 12, 2019
    Inventors: Daniel W. van der Weide, Max Lagally, Francesca Cavallo
  • Publication number: 20190145926
    Abstract: A detector or sensor including a transistor having a sensor element that generates a current when exposed to a stimulus such as light or a chemical, in one implementation, the sensor element is positioned between a transistor gate and a transistor channel. When the sensor element is not being exposed to the stimulus, the transistor outputs a first voltage on a transistor drain contact when the transistor inverts. When the sensor element is being exposed to the stimulus, the transistor outputs a second voltage on the transistor drain contact when the transistor inverts, where the second voltage is higher than the first voltage.
    Type: Application
    Filed: March 21, 2017
    Publication date: May 16, 2019
    Inventors: Sanjay KRISHNA, Payman ZARKESH-HA, David A. RAMIREZ, Brianna KLEIN, Francesca CAVALLO, Seyedeh Marziyeh ZAMIRI, Alireza KAZEMI, Clark KADLEC
  • Patent number: 10141469
    Abstract: A solar cell for collecting solar radiation can include a barrier layer such as a dielectric barrier layer and a heterostructure including a first light absorbing layer and at least a second light absorbing layer. A method for forming the solar cell can include forming a sacrificial layer on a support substrate and forming the barrier layer on the sacrificial layer. The barrier layer is formed to have a strain gradient through its thickness. The heterostructure is attached to the barrier layer and the sacrificial layer is removed, thereby separating the barrier layer and the heterostructure from the support substrate. During the removal of the sacrificial layer, the strain gradient causes the barrier layer and heterostructure, to roll, curl, or spiral, thereby resulting in a radially stacked heterostructure that provides a light concentrating optical cavity having multiple light absorbing layers with different band gaps.
    Type: Grant
    Filed: August 31, 2017
    Date of Patent: November 27, 2018
    Assignee: STC.UNM
    Inventors: Francesca Cavallo, Vijay Saradhi Mangu
  • Publication number: 20180337082
    Abstract: A method for forming a semiconductor structure, includes: providing a host substrate; forming at least one sacrificial layer having two or more group-V species over the host substrate; forming at least one semiconductor layer over the at least one sacrificial layer; and transferring at least a portion of the at least one semiconductor layer from the host substrate onto an alternate substrate.
    Type: Application
    Filed: August 30, 2016
    Publication date: November 22, 2018
    Inventors: Sanjay KRISHNA, Brianna KLEIN, Francesca CAVALLO, Seyedeh Marziyeh ZAMIRI
  • Patent number: 9324804
    Abstract: Electrically conductive material structures, analog electronic devices incorporating the structures and methods for making the structures are provided. The structures include a layer of graphene on a semiconductor substrate. The graphene layer and the substrate are separated by an interfacial region that promotes transfer of charge carriers from the surface of the substrate to the graphene.
    Type: Grant
    Filed: March 21, 2014
    Date of Patent: April 26, 2016
    Assignee: Wisconsin Alumni Research Foundation
    Inventors: Max G. Lagally, Francesca Cavallo, Richard Rojas-Delgado
  • Publication number: 20150270350
    Abstract: Electrically conductive material structures, analog electronic devices incorporating the structures and methods for making the structures are provided. The structures include a layer of graphene on a semiconductor substrate. The graphene layer and the substrate are separated by an interfacial region that promotes transfer of charge carriers from the surface of the substrate to the graphene.
    Type: Application
    Filed: March 21, 2014
    Publication date: September 24, 2015
    Inventors: Max G. Lagally, Francesca Cavallo, Richard Rojas-Delgado
  • Patent number: 9059335
    Abstract: Electronic devices for the generation of electromagnetic radiation are provided. Also provided are methods for using the devices to generate electromagnetic radiation. The radiation sources include an anisotropic electrically conducting thin film that is characterized by a periodically varying charge carrier mobility in the plane of the film. The periodic variation in carrier mobility gives rise to a spatially varying electric field, which produces electromagnetic radiation as charged particles pass through the film.
    Type: Grant
    Filed: February 27, 2013
    Date of Patent: June 16, 2015
    Assignee: Wisconsin Alumni Research Foundation
    Inventors: Francesca Cavallo, Max G. Lagally, Richard Rojas-Delgado
  • Publication number: 20140239201
    Abstract: Electronic devices for the generation of electromagnetic radiation are provided. Also provided are methods for using the devices to generate electromagnetic radiation. The radiation sources include an anisotropic electrically conducting thin film that is characterized by a periodically varying charge carrier mobility in the plane of the film. The periodic variation in carrier mobility gives rise to a spatially varying electric field, which produces electromagnetic radiation as charged particles pass through the film.
    Type: Application
    Filed: February 27, 2013
    Publication date: August 28, 2014
    Applicant: Wisconsin Alumni Research Foundation
    Inventors: Francesca Cavallo, Max G. Lagally, Richard Rojas-Delgado
  • Patent number: 7598109
    Abstract: Thin films, which are deposited on a sacrificial film on a substrate, are released and bonded back on a substrate surface. This technology provides open and closed 2D confined micro-/nano-channels and channel networks on a substrate surface. The geometry, size and complexity of the channels and channel networks can be modified by the film and substrate properties as well as the treatment techniques of the sacrificial layer etching. A method to fabricate such structures with position- and pattern-controllability is provided.
    Type: Grant
    Filed: January 29, 2007
    Date of Patent: October 6, 2009
    Assignee: Max-Plank-Gesellschaft zur Forderung der Wissenschaften E.V.
    Inventors: Oliver G. Schmidt, Yongfeng Mei, Dominic Thurmer, Francesca Cavallo
  • Publication number: 20070178655
    Abstract: Thin films, which are deposited on a sacrificial film on a substrate, are released and bonded back on a substrate surface. This technology provides open and closed 2D confined micro-/nano-channels and channel networks on a substrate surface. The geometry, size and complexity of the channels and channel networks can be modified by the film and substrate properties as well as the treatment techniques of the sacrificial layer etching. A method to fabricate such structures with position- and pattern-controllability is provided.
    Type: Application
    Filed: January 29, 2007
    Publication date: August 2, 2007
    Inventors: Oliver G. Schmidt, Yongfeng Mei, Dominic Thurmer, Francesca Cavallo