Patents by Inventor Keiki Fukumoto

Keiki Fukumoto 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).

  • Time-resolved photoemission electron microscopy and method for imaging carrier dynamics using the technique
    Patent number: 10989679
    Abstract: A time-resolved photoemission electron microscopy including: a laser light source that outputs a pulse having less than or equal to a femtosecond level pulse width and variable repetition frequency; a pump light pulse generator configured to generate pump light pulse that excites photo-carriers of a sample by converting wavelength of light output from the laser light source; and a probe light pulse generator configured to generate probe light pulse that photo-emits photo-carriers excited by the pump light pulse from the sample by photoelectric effect by converting wavelength of light output from the laser light source. The energy of at least one of the pump light pulse and the probe light pulse is configured to continuously vary in a range not less than 0.1 eV and not more than 8 eV.
    Type: Grant
    Filed: February 9, 2018
    Date of Patent: April 27, 2021
    Assignees: TOKYO INSTITUTE OF TECHNOLOGY, INTER-UNIVERSITY RESEARCH INSTITUTE CORPORATION HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATION
    Inventors: Shinya Koshihara, Keiki Fukumoto
  • TIME-RESOLVED PHOTOEMISSION ELECTRON MICROSCOPY AND METHOD FOR IMAGING CARRIER DYNAMICS USING THE TECHNIQUE
    Publication number: 20200072771
    Abstract: A time-resolved photoemission electron microscopy including: a laser light source that outputs a pulse having less than or equal to a femtosecond level pulse width and variable repetition frequency; a pump light pulse generator configured to generate pump light pulse that excites photo-carriers of a sample by converting wavelength of light output from the laser light source; and a probe light pulse generator configured to generate probe light pulse that photo-emits photo-carriers excited by the pump light pulse from the sample by photoelectric effect by converting wavelength of light output from the laser light source. The energy of at least one of the pump light pulse and the probe light pulse is configured to continuously vary in a range not less than 0.1 eV and not more than 8 eV.
    Type: Application
    Filed: February 9, 2018
    Publication date: March 5, 2020
    Applicants: TOKYO INSTITUTE OF TECHNOLOGY, INTER-UNIVERSITY RESEARCH INSTITUTE CORPORATION HIGH ENERGY ACCELERATOR RESEARCH ORGANIZATION
    Inventors: Shinya Koshihara, Keiki Fukumoto