Patents by Inventor Xiaohua Shen

Xiaohua Shen 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: 20240351623
    Abstract: Subway tunnel intelligent monitoring method and system relate to the field of track detection. The method includes: activating the inspection device to inspect the track section and detect foreign objects; when the inspection device detects the foreign object during foreign object detection, identifying and acquiring a volume of the foreign object, and according to a correspondence between a range interval to which the volume of the foreign object belongs and a processing scheme, determining the processing scheme for the foreign object with the corresponding volume; implementing the processing scheme for the foreign object with the corresponding volume.
    Type: Application
    Filed: July 3, 2024
    Publication date: October 24, 2024
    Inventors: Xiangsheng CHEN, Xiaohua BAO, Hongzhi CUI, Jun SHEN
  • Publication number: 20230360937
    Abstract: High bandwidth time-and-space resolved scatter phase transition microscopy systems configured to detect melt onset in a wafer being processed by laser annealing systems with ultra-short dwell times and spot size.
    Type: Application
    Filed: April 10, 2023
    Publication date: November 9, 2023
    Inventors: Matthew Earl Wallace Reed, Xiaohua Shen
  • Patent number: 9490128
    Abstract: Methods of annealing a thin semiconductor wafer are disclosed. The methods allow for high-temperature annealing of one side of a thin semiconductor wafer without damaging or overheating heat-sensitive electronic device features that are either on the other side of the wafer or embedded within the wafer. The annealing is performed at a temperature below the melting point of the wafer so that no significant dopant redistribution occurs during the annealing process. The methods can be applied to activating dopants or to forming ohmic contacts.
    Type: Grant
    Filed: August 27, 2012
    Date of Patent: November 8, 2016
    Assignee: Ultratech, Inc.
    Inventors: Yun Wang, Andrew M. Hawryluk, Xiaoru Wang, Xiaohua Shen
  • Patent number: 8906742
    Abstract: Systems and methods are disclosed for performing laser annealing in a manner that reduces or minimizes wafer surface temperature variations during the laser annealing process. The systems and methods include annealing the wafer surface with first and second laser beams that represent preheat and anneal laser beams having respective first and second intensities. The preheat laser beam brings the wafer surface temperate close to the annealing temperature and the anneal laser beam brings the wafer surface temperature up to the annealing temperature. The anneal laser beam can have a different wavelength, or the same wavelength but different orientation relative to the wafer surface. Reflectivity maps of the wafer surface at the preheat and anneal wavelengths are measured and used to select the first and second intensities that ensure good anneal temperature uniformity as a function of wafer position. The first and second intensities can also be selected to minimize edge damage or slip generation.
    Type: Grant
    Filed: August 29, 2013
    Date of Patent: December 9, 2014
    Assignee: Ultratech, Inc.
    Inventors: Xiaohua Shen, Yun Wang, Xiaoru Wang
  • Publication number: 20140057457
    Abstract: Methods of annealing a thin semiconductor wafer are disclosed. The methods allow for high-temperature annealing of one side of a thin semiconductor wafer without damaging or overheating heat-sensitive electronic device features that are either on the other side of the wafer or embedded within the wafer. The annealing is performed at a temperature below the melting point of the wafer so that no significant dopant redistribution occurs during the annealing process. The methods can be applied to activating dopants or to forming ohmic contacts.
    Type: Application
    Filed: August 27, 2012
    Publication date: February 27, 2014
    Inventors: Yun Wang, Andrew M. Hawryluk, Xiaoru Wang, Xiaohua Shen
  • Publication number: 20140004627
    Abstract: Systems and methods are disclosed for performing laser annealing in a manner that reduces or minimizes wafer surface temperature variations during the laser annealing process. The systems and methods include annealing the wafer surface with first and second laser beams that represent preheat and anneal laser beams having respective first and second intensities. The preheat laser beam brings the wafer surface temperate close to the annealing temperature and the anneal laser beam brings the wafer surface temperature up to the annealing temperature. The anneal laser beam can have a different wavelength, or the same wavelength but different orientation relative to the wafer surface. Reflectivity maps of the wafer surface at the preheat and anneal wavelengths are measured and used to select the first and second intensities that ensure good anneal temperature uniformity as a function of wafer position. The first and second intensities can also be selected to minimize edge damage or slip generation.
    Type: Application
    Filed: August 29, 2013
    Publication date: January 2, 2014
    Applicant: Ultratech
    Inventors: Xiaohua Shen, Yun Wang, Xiaoru Wang
  • Patent number: 8546805
    Abstract: Systems and methods are disclosed for performing laser annealing in a manner that reduces or minimizes wafer surface temperature variations during the laser annealing process. The systems and methods include annealing the wafer surface with first and second laser beams that represent preheat and anneal laser beams having respective first and second intensities. The preheat laser beam brings the wafer surface temperate close to the annealing temperature and the anneal laser beam brings the wafer surface temperature up to the annealing temperature. The anneal laser beam can have a different wavelength, or the same wavelength but different orientation relative to the wafer surface. Reflectivity maps of the wafer surface at the preheat and anneal wavelengths are measured and used to select first and second intensities that ensure good anneal temperature uniformity as a function of wafer position.
    Type: Grant
    Filed: January 27, 2012
    Date of Patent: October 1, 2013
    Assignee: Ultratech, Inc.
    Inventors: Xiaohua Shen, Yun Wang, Xiaoru Wang
  • Publication number: 20130196455
    Abstract: Systems and methods are disclosed for performing laser annealing in a manner that reduces or minimizes wafer surface temperature variations during the laser annealing process. The systems and methods include annealing the wafer surface with first and second laser beams that represent preheat and anneal laser beams having respective first and second intensities. The preheat laser beam brings the wafer surface temperate close to the annealing temperature and the anneal laser beam brings the wafer surface temperature up to the annealing temperature. The anneal laser beam can have a different wavelength, or the same wavelength but different orientation relative to the wafer surface. Reflectivity maps of the wafer surface at the preheat and anneal wavelengths are measured and used to select first and second intensities that ensure good anneal temperature uniformity as a function of wafer position.
    Type: Application
    Filed: January 27, 2012
    Publication date: August 1, 2013
    Inventors: Xiaohua Shen, Yun Wang, Xiaoru Wang
  • Patent number: 7354389
    Abstract: A detector for optical analysis of a biochip determines the focal position of a plurality of analytes on the biochip using one or more registration markers on the biochip, wherein the analytes and the registration marker are illuminated by different light sources. Therefore, contemplated configurations will significantly reduce overall focusing time and automate proper positioning of the biochip, while allowing to determine a focal position without photobleaching or other undesirable effects on optically labile compounds. Thus, automated analyses can be performed without manual user intervention.
    Type: Grant
    Filed: May 28, 2003
    Date of Patent: April 8, 2008
    Assignee: Autogenomics, Inc.
    Inventors: Fareed Kureshy, Vijay K. Mahant, Shailendra Singh, Xiaohua Shen
  • Publication number: 20050118640
    Abstract: A detector for optical analysis of a biochip determines the focal position of a plurality of analytes on the biochip using one or more registration markers on the biochip, wherein the analytes and the registration marker are illuminated by different light sources. Therefore, contemplated configurations will significantly reduce overall focusing time and automate proper positioning of the biochip, while allowing to determine a focal position without photobleaching or other undesirable effects on optically labile compounds. Thus, automated analyses can be performed without manual user intervention.
    Type: Application
    Filed: May 28, 2003
    Publication date: June 2, 2005
    Inventors: Fareed Kureshy, Vijay Mahant, Shailendra Singh, Xiaohua Shen