Patents by Inventor Allan S. Bracker

Allan S. Bracker 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).

  • Strain tuning individual quantum dot emission frequencies with local phase transitions
    Patent number: 11150495
    Abstract: A technique is described to deterministically tune the emission frequency of individual semiconductor photon sources, for example quantum dots. A focused laser is directed at a film of material that changes form when heated (for example, a phase change material that undergoes change between crystal and amorphous forms) overlaid on a photonic membrane that includes the photon sources. The laser causes a localized change in form in the film, resulting in a change in emission frequency of a photon source.
    Type: Grant
    Filed: May 24, 2019
    Date of Patent: October 19, 2021
    Assignee: The Government of the United States of America, as represented by the Secretary of the Navy
    Inventors: Joel Q. Grim, Allan S. Bracker, Samuel Carter, Daniel Gammon
  • Deterministic frequency tuning of quantum dots in photonic crystal membranes using micro-laser processing
    Patent number: 10921519
    Abstract: Emission frequency of quantum dots in a photonic crystal membrane can be tuned by laser light treatment. For example, a focused laser can heat InAs quantum dots embedded within a <200 nm photonic crystal GaAs membrane. At temperatures above about 600° C., indium atoms from the quantum dots and gallium atoms from the membrane interdiffuse, alloying the quantum dots with the surrounding membrane. This causes the quantum dots to become more gallium rich, which shifts the emission to higher frequencies.
    Type: Grant
    Filed: September 11, 2018
    Date of Patent: February 16, 2021
    Assignee: The Government of the United States of America, as represented by the Secretary of the Navy
    Inventors: Joel Q. Grim, Samuel Carter, Allan S. Bracker, Daniel Gammon
  • Strain Tuning Individual Quantum Dot Emission Frequencies with Local Phase Transitions
    Publication number: 20190369420
    Abstract: A technique is described to deterministically tune the emission frequency of individual semiconductor photon sources, for example quantum dots. A focused laser is directed at a film of material that changes form when heated (for example, a phase change material that undergoes change between crystal and amorphous forms) overlaid on a photonic membrane that includes the photon sources. The laser causes a localized change in form in the film, resulting in a change in emission frequency of a photon source.
    Type: Application
    Filed: May 24, 2019
    Publication date: December 5, 2019
    Inventors: Joel Q. Grim, Allan S. Bracker, Samuel Carter, Daniel Gammon
  • Deterministic Frequency Tuning of Quantum Dots in Photonic Crystal Membranes Using Micro-Laser Processing
    Publication number: 20190079245
    Abstract: Emission frequency of quantum dots in a photonic crystal membrane can be tuned by laser light treatment. For example, a focused laser can heat InAs quantum dots embedded within a <200 nm photonic crystal GaAs membrane. At temperatures above about 600° C., indium atoms from the quantum dots and gallium atoms from the membrane interdiffuse, alloying the quantum dots with the surrounding membrane. This causes the quantum dots to become more gallium rich, which shifts the emission to higher frequencies.
    Type: Application
    Filed: September 11, 2018
    Publication date: March 14, 2019
    Inventors: Joel Q. Grim, Samuel Carter, Allan S. Bracker, Daniel Gammon
  • Method for generating a single photon for quantum information processing
    Patent number: 9671672
    Abstract: A solid-state device for generating a single photon for quantum information processing, the device including: a quantum dot molecule including: a first singly-charged quantum dot; and a second singly-charged quantum dot; wherein the first singly-charged quantum dot is adjacent to the second singly-charged quantum dot; and a tunnel barrier that separates the first singly-charged quantum dot from the second singly-charged quantum dot.
    Type: Grant
    Filed: March 20, 2017
    Date of Patent: June 6, 2017
    Assignee: The United States of America, as represented by the Secretary of the Navy
    Inventors: Daniel Gammon, Samuel Carter, Allan S. Bracker, Patrick Vora
  • Single photon source based on a quantum dot molecule in an optical cavity
    Patent number: 9619754
    Abstract: A solid-state device for generating a single photon for quantum information processing, the device including: a quantum dot molecule including: a first singly-charged quantum dot; and a second singly-charged quantum dot; wherein the first singly-charged quantum dot is adjacent to the second singly-charged quantum dot; and a tunnel barrier that separates the first singly-charged quantum dot from the second singly-charged quantum dot.
    Type: Grant
    Filed: August 10, 2015
    Date of Patent: April 11, 2017
    Assignee: The United States of America, as represented by the Secretary of the Navy
    Inventors: Daniel Gammon, Samuel Carter, Allan S. Bracker, Patrick Vora
  • Single photon source based on a quantum dot molecule in an optical cavity
    Publication number: 20160048769
    Abstract: A solid-state device for generating a single photon for quantum information processing, the device including: a quantum dot molecule including: a first singly-charged quantum dot; and a second singly-charged quantum dot; wherein the first singly-charged quantum dot is adjacent to the second singly-charged quantum dot; and a tunnel barrier that separates the first singly-charged quantum dot from the second singly-charged quantum dot.
    Type: Application
    Filed: August 10, 2015
    Publication date: February 18, 2016
    Applicant: The Government of the United States of America, as represented by the Secretary of the Navy
    Inventors: Daniel Gammon, Samuel Carter, Allan S. Bracker, Patrick Vora