Patents by Inventor Sagi V. Mathai

Sagi V. Mathai 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: 20190173585
    Abstract: An apparatus includes a first and second VCSEL, each with an integrated lens. The VCSELs emit a first light beam having first optical modes at first wavelengths and a second light beam having second optical modes at second wavelengths. The apparatus also has an optical block with a first and second surface, a mirror coupled to the second surface, and a wavelength-selective filter coupled to the first surface. The first integrated lens mode matches the first beam to the optical block, and the second integrated lens mode matches the second beam to the optical block such that the first beam and second beam each have substantially a beam waist with a beam waist dimension at the first and second input region, respectively. An exit beam that includes light from the first beam and the second beam is output from the second surface of the optical block.
    Type: Application
    Filed: January 29, 2019
    Publication date: June 6, 2019
    Inventors: Wayne Sorin, Michael Renne Ty Tan, Sagi V. Mathai, Georgios Panotopoulos, Paul K. Rosenberg
  • Patent number: 10305248
    Abstract: A high contrast grating optoelectronic apparatus includes an optoelectronic device at a front surface of a substrate. The optoelectronic device is to one or both of emit light and detect light through a back surface of the substrate opposite the front surface. A high contrast grating (HCG) lens is adjacent to and spaced apart from the back surface of the substrate by a spacer. The spacer includes one or both of a wafer-bonded substrate and a cavity. The HCG lens is to focus the light.
    Type: Grant
    Filed: October 29, 2013
    Date of Patent: May 28, 2019
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Sagi V. Mathai, Michael Renne Ty Tan, David A. Fattal, Wayne V. Sorin
  • Patent number: 10290996
    Abstract: A bottom-emitting vertical-cavity surface-emitting laser (VCSEL) structure includes a first substrate permitting the passage of light therethrough, an n-doped distributed Bragg reflector (nDBR), a p-doped distributed Bragg reflector (pDBR), one or more active layers, at least one of a high contrast grating mirror and a dielectric-enhanced metal mirror, and a plurality of layers, where the VCSEL structure is configured to be flip chipped to a second substrate. The pDBR and the nDBR define a laser cavity extending vertically therebetween and containing the one or more active layers. The at least one of a high contrast grating mirror and a dielectric-enhanced metal mirror may be disposed over the pDBR. The plurality of layers may be disposed over the at least one of the high contrast grating mirror and the dielectric-enhanced metal mirror to optically and hermetically seal the laser cavity.
    Type: Grant
    Filed: April 25, 2018
    Date of Patent: May 14, 2019
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Sagi Varghese Mathai, Stanley Cheung, Wayne V. Sorin, Michael Renne Ty Tan
  • Patent number: 10243661
    Abstract: An apparatus includes a first and second VCSEL, each with an integrated lens. The VCSELs emit a first light beam having first optical modes at first wavelengths and a second light beam having second optical modes at second wavelengths. The apparatus also has an optical block with a first and second surface, a mirror coupled to the second surface, and a wavelength-selective filter coupled to the first surface. The first integrated lens mode matches the first beam to the optical block, and the second integrated lens mode matches the second beam to the optical block such that the first beam and second beam each have substantially a beam waist with a beam waist dimension at the first and second input region, respectively. An exit beam that includes light from the first beam and the second beam is output from the second surface of the optical block.
    Type: Grant
    Filed: August 15, 2014
    Date of Patent: March 26, 2019
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Wayne Sorin, Michael Renne Ty Tan, Sagi V Mathai, Georgios Panotopoulos, Paul K Rosenberg
  • Publication number: 20190013646
    Abstract: A vertical-cavity surface-emitting laser (VCSEL) includes a first reflector having a first reflectivity; a second reflector having a second reflectivity, where the second reflectivity is less than the first reflectivity; a gain region between the first and second reflectors; and a substrate having a first surface and a second surface, where the first surface is coupled to the second reflector, and where the second surface is formed into a lens to act upon light emitted by the VCSEL through the substrate. The VCSEL lases in a single transverse mode.
    Type: Application
    Filed: August 28, 2018
    Publication date: January 10, 2019
    Inventors: Michael Renne Ty Tan, Wayne V. Sorin, Sagi V. Mathai
  • Patent number: 10079474
    Abstract: A vertical-cavity surface-emitting laser (VCSEL) includes first reflector having a first reflectivity; a second reflector having a second reflectivity, where the second reflectivity is less than the first reflectivity; a gain region between the first and second reflectors; and a substrate having a first surface and a second surface, where the first surface is coupled to the second reflector, and where the second surface is formed into a lens to act upon light emitted the VCSEL through the substrate. The VCSEL lases in a single transverse mode.
    Type: Grant
    Filed: September 22, 2014
    Date of Patent: September 18, 2018
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Michael Renne Ty Tan, Wayne V Sorin, Sagi V Mathai
  • Patent number: 9921377
    Abstract: A substrate comprises multiple interposers. Each interposer includes interposer elements, where an optical device is coupled to at least some of the interposer elements; two passages formed through the interposer, where each passage is registered with respect to the interposer elements; two blind holes formed in a surface of the interposer, where each blind hole is concentric with a different passage; two annular troughs formed in the surface, each concentric with a different passage, and an annular area separates the annular troughs from an outer diameter of the corresponding concentric passage; and two spherical registration elements, where each registration element is positioned on uncured adhesive on one of the annular areas, where the passages enable a vacuum to be drawn through such that the registration elements are pulled toward the surface of the interposer to self-align to the inner diameter of the blind holes.
    Type: Grant
    Filed: July 31, 2014
    Date of Patent: March 20, 2018
    Assignee: Hewlett Packard Enterprise Department LP
    Inventors: Paul K Rosenberg, Sagi V Mathai, Michael Renne Ty Tan
  • Publication number: 20170230116
    Abstract: An apparatus includes a first and second VCSEL, each with an integrated lens. The VCSELs emit a first light beam having first optical modes at first wavelengths and a second light beam having second optical modes at second wavelengths. The apparatus also has an optical block with a first and second surface, a mirror coupled to the second surface, and a wavelength-selective filter coupled to the first surface. The first integrated lens mode matches the first beam to the optical block, and the second integrated lens mode matches the second beam to the optical block such that the first beam and second beam each have substantially a beam waist with a beam waist dimension at the first and second input region, respectively. An exit beam that includes light from the first beam and the second beam is output from the second surface of the optical block.
    Type: Application
    Filed: August 15, 2014
    Publication date: August 10, 2017
    Inventors: Wayne SORIN, Michael Renne Ty TAN, Sagi V MATHAI, Sr., Georgios PANOTOPOULOS, Paul K ROSENBERG
  • Publication number: 20170214218
    Abstract: A vertical-cavity surface-emitting laser (VCSEL) includes first reflector having a first reflectivity; a second reflector having a second reflectivity, where the second reflectivity is less than the first reflectivity; a gain region between the first and second reflectors; and a substrate having a first surface and a second surface, where the first surface is coupled to the second reflector, and where the second surface is formed into a lens to act upon light emitted the VCSEL through the substrate. The VCSEL lases in a single transverse mode.
    Type: Application
    Filed: September 22, 2014
    Publication date: July 27, 2017
    Inventors: Michael Renne Ty TAN, Wayne V. SORIN, Sagi V. MATHAI
  • Publication number: 20170168251
    Abstract: A substrate comprises multiple interposers. Each interposer includes interposer elements, where an optical device is coupled to at least some of the interposer elements; two passages formed through the interposer, where each passage is registered with respect to the interposer elements; two blind holes formed in a surface of the interposer, where each blind hole is concentric with a different passage; two annular troughs formed in the surface, each concentric with a different passage, and an annular area separates the annular troughs from an outer diameter of the corresponding concentric passage; and two spherical registration elements, where each registration element is positioned on uncured adhesive on one of the annular areas, where the passages enable a vacuum to be drawn through such that the registration elements are pulled toward the surface of the interposer to self-align to the inner diameter of the blind holes.
    Type: Application
    Filed: July 31, 2014
    Publication date: June 15, 2017
    Inventors: Paul K ROSENBERG, Sagi V MATHAI, Michael Renne Ty TAN
  • Publication number: 20160301188
    Abstract: A high contrast grating optoelectronic apparatus includes an optoelectronic device at a front surface of a substrate. The optoelectronic device is to one or both of emit light and detect light through a back surface of the substrate opposite the front surface. A high contrast grating (HCG) lens is adjacent to and spaced apart from the back surface of the substrate by a spacer. The spacer includes one or both of a wafer-bonded substrate and a cavity. The HCG lens is to focus the light.
    Type: Application
    Filed: October 29, 2013
    Publication date: October 13, 2016
    Applicant: HEWLETT PACKARD ENTERPRISE DEVELOPMENT LP
    Inventors: Sagi V. Mathai, Michael Renne Ty Tan, David A. Fattal, Wayne V. Sorin
  • Patent number: 8755656
    Abstract: A blade includes a circuit board to insert into a slot of a chassis, an optoelectronic device on the circuit board, an optical media that is flexible, coupled to the optoelectronic device, and able to guide a plurality of optical signals, a first connector optically coupled to the optical media, and a standoff on which the first connector is mounted. The first connector includes first alignment features shaped to mate with second alignment features of a second connector. The standoff provides the first connector with sufficient freedom of motion to permit the first alignment features to shift the first connector relative to the second connector and into a seated position as the first connector and the second connector move toward each other.
    Type: Grant
    Filed: August 7, 2013
    Date of Patent: June 17, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Michael Renne Ty Tan, Paul K Rosenberg, Sagi V Mathai, Moray McLaren, Shih-Yuan Wang
  • Patent number: 8711484
    Abstract: A method for fabricating a pellicle beam splitter includes etching an aperture in a support substrate; bonding a beam splitter substrate to an upper surface of the support substrate so that the beam splitter substrate covers the aperture; and depositing at least one optical coating on the beam splitter substrate. A pellicle beam splitter includes a support substrate, an aperture created in the support substrate using a semiconductor fabrication processes and a beam-splitting coating covering the aperture.
    Type: Grant
    Filed: May 6, 2008
    Date of Patent: April 29, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Jong-Souk Yeo, Sagi V. Mathai, Michael Renne Ty Tan
  • Publication number: 20130322830
    Abstract: A blade includes a circuit board to insert into a slot of a chassis, an optoelectronic device on the circuit board, an optical media that is flexible, coupled to the optoelectronic device, and able to guide a plurality of optical signals, a first connector optically coupled to the optical media, and a standoff on which the first connector is mounted. The first connector includes first alignment features shaped to mate with second alignment features of a second connector. The standoff provides the first connector with sufficient freedom of motion to permit the first alignment features to shift the first connector relative to the second connector and into a seated position as the first connector and the second connector move toward each other.
    Type: Application
    Filed: August 7, 2013
    Publication date: December 5, 2013
    Applicant: Hewlett-Packard Development Company, L.P.
    Inventors: MICHAEL RENNE TY TAN, PAUL K. ROSENBERG, SAGI V. MATHAI, MORAY McLAREN, SHIH-YUAN WANG
  • Patent number: 8571366
    Abstract: A system employs a flexible optical media, two connectors, and a mechanism such as a magnet that brings the connector together when the connectors are close to each other. The optical media is able to guide optical signals, and one connector is attached to an end of the optical media. Each connector also has alignment features and provides paths for the optical signals. The alignment features of each connector are shaped to mate with the alignment features of the other connector and to shift the connectors relative to each other as the mechanism pushes the connector together. The alignment features further have seated positions at which the paths in one connector are aligned with the paths in the other connector and separated by a free space gap.
    Type: Grant
    Filed: May 9, 2008
    Date of Patent: October 29, 2013
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Michael R. T. Tan, Paul K. Rosenberg, Sagi V. Mathai, Moray McLaren, Shih-Yuan Wang
  • Patent number: 8369665
    Abstract: A hybrid guided-mode resonance (GMR) grating, an optical filter and a method of optical filtering employ distributed Bragg reflection. The hybrid GMR grating includes a waveguide layer that supports a GMR having a GMR resonant frequency. The hybrid GMR grating further includes a diffraction grating that couples a portion of a signal incident on the hybrid GMR grating into the waveguide layer; and a distributed Bragg reflector (DBR) that reflects another portion of the incident signal. The coupled portion of the incident signal has a frequency corresponding to the GMR resonant frequency. The reflected portion has a frequency away from the GMR resonant frequency. The optical filter includes the hybrid GMR grating and a coupler. The method includes coupling an optical signal into the hybrid GMR grating and further coupling a reflected signal out of the hybrid GMR grating.
    Type: Grant
    Filed: July 14, 2008
    Date of Patent: February 5, 2013
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: David A. Fattal, Qianfan Xu, Sagi V. Mathai, Michael R. Tan
  • Publication number: 20120039562
    Abstract: A system employs a flexible optical media, two connectors, and a mechanism such as a magnet that brings the connector together when the connectors are close to each other. The optical media is able to guide optical signals, and one connector is attached to an end of the optical media. Each connector also has alignment features and provides paths for the optical signals. The alignment features of each connector are shaped to mate with the alignment features of the other connector and to shift the connectors relative to each other as the mechanism pushes the connector together. The alignment features further have seated positions at which the paths in one connector are aligned with the paths in the other connector and separated by a free space gap.
    Type: Application
    Filed: May 9, 2008
    Publication date: February 16, 2012
    Inventors: Michael T. Tan, Paul K. Rosenberg, Sagi V. Mathai, Moray Mclaren, Shih-Yuan Wang
  • Publication number: 20110272014
    Abstract: A photovoltaic structure of a photovoltaic cell and a method of fabricating a photovoltaic structure, employ a nanowire having a base connected to a stub and an electrical isolation layer surrounding the stub. The stub is a constituent of a substrate surface. The nanowire extends away from the substrate surface and is wider than the stub. The nanowire base overlies a part of the isolation layer that is adjacent to the stub. A semiconductor junction comprises the nanowire. The method includes forming the stub; growing the nanowire from the stub; and conformally coating the nanowire. A nanoparticle is applied to the substrate surface. The isolation layer is created on and embedded in the substrate surface using the nanoparticle as a mask. A portion of the substrate surface underlying the nanoparticle forms the stub. The nanoparticle catalyzes nanowire growth on the stub. The stub is narrower than the nanoparticle.
    Type: Application
    Filed: December 19, 2008
    Publication date: November 10, 2011
    Inventors: Sagi V. Mathai, Nobuhiko P. Kobayashi, Shih-Yuan Wang
  • Publication number: 20110220171
    Abstract: A photovoltaic structure (100), a solar cell (100, 200) and a method (300) of fabricating a solar cell (100, 200) employ a hidden electrode (122, 222, 422) on a formed (320) mesa (120, 220, 420) and a bramble (130, 230, 430) of grown (330) nanowires. The mesa includes an insulator island (121, 221, 421) adjacent to a surface of the substrate (110, 210, 410) and the hidden electrode buried under a seed layer on the insulator island. One end of some of the nanowires (134, 234) is anchored to the seed layer (124, 224, 424) of the mesa. One end of others of the nanowires (132, 232) is anchored to a seed layer (114, 214, 414) formed (310) on the substrate adjacent to the mesa. The seed layers independently are an extrinsic semiconductor. A semiconductor junction includes the seed layers and some of the nanowires of the bramble.
    Type: Application
    Filed: January 30, 2009
    Publication date: September 15, 2011
    Inventors: Sagi V. Mathai, Shih-Yuan Wang
  • Publication number: 20110188807
    Abstract: A hybrid guided-mode resonance (GMR) grating, an optical filter and a method of optical filtering employ distributed Bragg reflection. The hybrid GMR grating includes a waveguide layer that supports a GMR having a GMR resonant frequency. The hybrid GMR grating further includes a diffraction grating that couples a portion of a signal incident on the hybrid GMR grating into the waveguide layer; and a distributed Bragg reflector (DBR) that reflects another portion of the incident signal. The coupled portion of the incident signal has a frequency corresponding to the GMR resonant frequency. The reflected portion has a frequency away from the GMR resonant frequency. The optical filter includes the hybrid GMR grating and a coupler. The method includes coupling an optical signal into the hybrid GMR grating and further coupling a reflected signal out of the hybrid GMR grating.
    Type: Application
    Filed: July 14, 2008
    Publication date: August 4, 2011
    Inventors: David A. Fattal, Qianfan Xu, Sagi V. Mathai, Michael R. Tan