Patents by Inventor Sumith V. Bandara

Sumith V. Bandara 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).

  • Multi-directional radiation coupling in quantum-well infrared photodetectors
    Patent number: 6423980
    Abstract: Techniques for coupling radiation into a quantum-well detector by using a two-dimensional array of grating cells to form at least three different grating directions to provide efficient coupling.
    Type: Grant
    Filed: June 26, 2000
    Date of Patent: July 23, 2002
    Assignee: California Institute of Technology
    Inventors: Daniel W. Wilson, John K. Liu, Sumith V. Bandara, Sarath D. Gunapala
  • Multi-quantum-well detector for low-background applications
    Publication number: 20020074542
    Abstract: Device designs and techniques for reducing the dark current in quantum-well detectors.
    Type: Application
    Filed: September 26, 2001
    Publication date: June 20, 2002
    Inventors: Sarath D. Gunapala, Sumith V. Bandara, John K. Liu, Sir B. Rafol, David Z. Ting, Jason M. Mumolo
  • Slotted quantum well sensor
    Publication number: 20020008232
    Abstract: Quantum-well sensors having an array of spatially separated quantum-well columns formed on a substrate. A grating can be formed increase the coupling efficiency.
    Type: Application
    Filed: August 7, 2001
    Publication date: January 24, 2002
    Applicant: California Institute of Technology
    Inventors: Sarath D. Gunapala, Sumith V. Bandara, John K. Liu, Daniel W. Wilson
  • Slotted quantum well sensor
    Patent number: 6271537
    Abstract: Quantum-well sensors having an array of spatially separated quantum-well columns formed on a substrate. A grating can be formed increase the coupling efficiency.
    Type: Grant
    Filed: November 19, 1999
    Date of Patent: August 7, 2001
    Assignee: California Institute of Technology
    Inventors: Sarath D. Gunapala, Sumith V. Bandara, John K. Liu, Daniel W. Wilson
  • Dual-band quantum-well infrared sensing array having commonly biased contact layers
    Patent number: 6184538
    Abstract: Quantum-well sensing arrays for detecting radiation with two or more wavelengths. Each pixel includes at least two different quantum-well sensing stacks that are biased at a common voltage.
    Type: Grant
    Filed: October 16, 1998
    Date of Patent: February 6, 2001
    Assignee: California Institute of Technology
    Inventors: Sumith V. Bandara, Sarath D. Gunapala, John K. Liu