Patents by Inventor Todd H. Stievater
Todd H. Stievater 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).
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Publication number: 20240036259Abstract: An apparatus includes a polarization rotator or a polarization splitter. The polarization rotator and the polarization splitter each includes a first optical waveguide. The polarization rotator further includes a movable symmetry-breaking micro-electro-mechanical systems (“MEMS”) dielectric perturber separated from the first optical waveguide by a gap. The first optical waveguide and the MEMS dielectric perturber define a gap therebetween. The polarization rotator also includes a MEMS actuator moving the MEMS dielectric perturber so as to control the gap, thereby controlling polarization rotation within the first optical waveguide. The polarization splitter includes a second optical waveguide separated from the first optical waveguide by a gap. The polarization splitter also includes a MEMS actuator moving the first optical waveguide and/or the second optical waveguide so as to control the gap, thereby controlling polarization splitting between the optical waveguides.Type: ApplicationFiled: July 14, 2023Publication date: February 1, 2024Inventors: Marcel W. Pruessner, Todd H. Stievater, Nathan F. Tyndall
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Publication number: 20230417988Abstract: Method and apparatuses for photonic filtering using n-stage nonuniform lattice filters are provided. The n-stage nonuniform lattice filters includes a plurality of directional coupler-differential delay devices connected in series and an end-stage directional coupler. Each of the directional coupler-differential delay devices includes a directional coupler section and a differential delay section. Each directional coupler section has a corresponding coupling constant. Each differential delay section has a corresponding differential delay. A first of the plurality of directional coupler-differential delay devices is constructed to receive a pump and a signal. The end-stage directional coupler is connected in series to a last of the plurality of directional coupler-differential delay devices and includes an input port, a through port, and a cross port.Type: ApplicationFiled: June 22, 2023Publication date: December 28, 2023Inventors: Todd H. Stievater, Nathan Tyndall
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Patent number: 11754785Abstract: Methods and apparatuses for mode conversion. An apparatus that includes a substrate, a first waveguide, a second waveguide, a micro-electro-mechanical systems (MEMS) perturber, and a controller is provided. The first waveguide is formed on the substrate includes: (i) an input section, (ii) a bend section, and (iii) an output section. The second waveguide is also formed on the substrate and is disposed adjacent to a portion of the input section of the first waveguide. A portion of the second waveguide is separated from the input section of the first waveguide by a coupling gap. The perturber is disposed above the first waveguide and configured to move between a first position that is distal from a surface of the input section of the first waveguide and a second position that is closer to the surface of the input section of the first waveguide than the second position. The controller is configured to control a movement of the perturber between the first position and the second position.Type: GrantFiled: August 20, 2021Date of Patent: September 12, 2023Assignee: The Government of the United States of America, as represented by the Secretary of the NavyInventors: Marcel W. Pruessner, Dmitry A. Kozak, Todd H. Stievater, Brian J. Roxworthy
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Patent number: 11692982Abstract: Presented herein is a new concept of uniformly spin coating a flat surface with a stationary phase and creating a gas chromatography column by pressing a grooved lid, with micro-stamped ridges, down onto the coated substrate. The lids are molded out of commercially available rigid materials including epoxies so that when pressed onto a flat surface it will create an air tight seal. The epoxy material is rendered inert by a thin layer of gold.Type: GrantFiled: May 8, 2020Date of Patent: July 4, 2023Assignee: The Government of the United States of America, as represented by the Secretary of the NavyInventors: Robert Furstenberg, Christopher Breshike, Todd H. Stievater, Dmitry Kozak, R. Andrew McGill
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Publication number: 20230184623Abstract: A method and system for obtaining photonic parameters. The system includes a computer, an optical source, a first and second optical fiber, a Mach-Zehnder Interferometer (MZI) structure, and a detector. The computer includes a processor and memory. The optical source is constructed to emit light of a first optical mode and a second optical mode in response to an instruction by the computer. The first optical fiber receives the first or second optical mode. The MZI structure includes first and second pluralities MZIs and receives the first or second optical mode from the optical fiber. The second optical fiber receives light from the MZI structure. The detector is configured to receive light that propagated through the second optical fiber, generate image data and provide the image data to the computer. The computer obtains a plurality of photonic parameters based on the image data and initial guesses for the plurality of photonic parameters.Type: ApplicationFiled: December 14, 2022Publication date: June 15, 2023Inventors: Todd H. Stievater, Nathan Tyndall, Marcel W. Pruessner
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Publication number: 20230055779Abstract: Methods and apparatuses for mode conversion. An apparatus that includes a substrate, a first waveguide, a second waveguide, a micro-electro-mechanical systems (MEMS) perturber, and a controller is provided. The first waveguide is formed on the substrate includes: (i) an input section, (ii) a bend section, and (iii) an output section. The second waveguide is also formed on the substrate and is disposed adjacent to a portion of the input section of the first waveguide. A portion of the second waveguide is separated from the input section of the first waveguide by a coupling gap. The perturber is disposed above the first waveguide and configured to move between a first position that is distal from a surface of the input section of the first waveguide and a second position that is closer to the surface of the input section of the first waveguide than the second position. The controller is configured to control a movement of the perturber between the first position and the second position.Type: ApplicationFiled: August 20, 2021Publication date: February 23, 2023Inventors: Marcel W. Pruessner, Dmitry A. Kozak, Todd H. Stievater, Brian J. Roxworthy
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Publication number: 20200355652Abstract: Presented herein is a new concept of uniformly spin coating a flat surface with a stationary phase and creating a gas chromatography column by pressing a grooved lid, with micro-stamped ridges, down onto the coated substrate. The lids are molded out of commercially available rigid materials including epoxies so that when pressed onto a flat surface it will create an air tight seal. The epoxy material is rendered inert by a thin layer of gold.Type: ApplicationFiled: May 8, 2020Publication date: November 12, 2020Inventors: Robert Furstenberg, Christopher Breshike, Todd H. Stievater, Dmitry Kozak, R. Andrew McGill
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Patent number: 10302601Abstract: A chemical detector for rapid, simultaneous detection of multiple chemicals including chemical warfare agents, toxic industrial chemicals, and explosives having one or more gas chromatography columns each with a chemosorbent or a chemo-reactive stationary phase and an infrared-transparent base, a bright infrared light source, a mechanism to direct the light source to any point along any of the columns, and an infrared sensor. Another disclosed detector has one or more gas chromatography columns each on the surface of a substrate having at least one infrared-transparent waveguide pattern, a bright infrared light source, and at least one ring resonator for each column, where each ring resonator is coated with a chemosorbent or a chemo-reactive stationary phase, and where each ring resonator spectroscopically probes the stationary phase. Also disclosed are the related methods for chemical detection.Type: GrantFiled: March 21, 2017Date of Patent: May 28, 2019Assignee: The United States of America, as represented by the Secretary of the NavyInventors: R. Andrew McGill, Robert Furstenberg, Viet K. Nguyen, Chris Kendziora, Michael Papantonakis, Todd H. Stievater
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Patent number: 10054546Abstract: A system and method for detecting an analyte includes a waveguide configured to receive a narrow-band laser signal; and a sorbent material covering an analyte detection region of the waveguide, wherein the sorbent material is configured to sorb the analyte and bring the analyte to an evanescent field of the waveguide, and wherein Raman scattering is produced by an interaction of the evanescent field and the analyte sorbed in the sorbent material along the analyte detection region of the waveguide, and the waveguide is further configured to collect the Raman scattering along the analyte detection region of the waveguide, wherein the collected Raman scattering indicates a type of the analyte.Type: GrantFiled: October 14, 2016Date of Patent: August 21, 2018Assignee: The United States of America, as represented by the Secretary of the NavyInventors: Todd H. Stievater, Jacob B. Khurgin, Dmitry A. Kozak, Scott A. Holmstrom, R. Andrew McGill
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Publication number: 20170284976Abstract: A chemical detector for rapid, simultaneous detection of multiple chemicals including chemical warfare agents, toxic industrial chemicals, and explosives having one or more gas chromatography columns each with a chemosorbent or a chemo-reactive stationary phase and an infrared-transparent base, a bright infrared light source, a mechanism to direct the light source to any point along any of the columns, and an infrared sensor. Another disclosed detector has one or more gas chromatography columns each on the surface of a substrate having at least one infrared-transparent waveguide pattern, a bright infrared light source, and at least one ring resonator for each column, where each ring resonator is coated with a chemosorbent or a chemo-reactive stationary phase, and where each ring resonator spectroscopically probes the stationary phase. Also disclosed are the related methods for chemical detection.Type: ApplicationFiled: March 21, 2017Publication date: October 5, 2017Inventors: R. Andrew McGill, Robert Furstenberg, Viet K. Nguyen, Chris Kendziora, Michael Papantonakis, Todd H. Stievater
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Patent number: 9759552Abstract: A method and system described for sensing a displacement by receiving and propagating a laser light signal with an etched waveguide that is configured to enable an evanescent optical field above the waveguide surface. A movable perturber can be positioned so the perturber interacts with the evanescent optical field above the waveguide surface. An optical phase shift can be induced in the waveguide when the movable perturber is displaced in the evanescent optical field, and the optical phase shift can be measured with an optical readout circuit.Type: GrantFiled: May 31, 2016Date of Patent: September 12, 2017Assignee: The United States of America, as represented by the Secretary of the NavyInventors: Marcel W. Pruessner, Todd H. Stievater, William S. Rabinovich
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Publication number: 20170108439Abstract: A system and method for detecting an analyte includes a waveguide configured to receive a narrow-band laser signal; and a sorbent material covering an analyte detection region of the waveguide, wherein the sorbent material is configured to sorb the analyte and bring the analyte to an evanescent field of the waveguide, and wherein Raman scattering is produced by an interaction of the evanescent field and the analyte sorbed in the sorbent material along the analyte detection region of the waveguide, and the waveguide is further configured to collect the Raman scattering along the analyte detection region of the waveguide, wherein the collected Raman scattering indicates a type of the analyte.Type: ApplicationFiled: October 14, 2016Publication date: April 20, 2017Inventors: Todd H. Stievater, Jacob B. Khurgin, Dmitry A. Kozak, Scott A. Holmstrom, R. Andrew McGill
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Patent number: 9599567Abstract: A chemical detector for rapid, simultaneous detection of multiple chemicals including chemical warfare agents, toxic industrial chemicals, and explosives having one or more gas chromatography columns each with a chemosorbent or a chemo-reactive stationary phase and an infrared-transparent base, a bright infrared light source, a mechanism to direct the light source to any point along any of the columns, and an infrared sensor. Another disclosed detector has one or more gas chromatography columns each on the surface of a substrate having at least one infrared-transparent waveguide pattern, a bright infrared light source, and at least one ring resonator for each column, where each ring resonator is coated with a chemosorbent or a chemo-reactive stationary phase, and where each ring resonator spectroscopically probes the stationary phase. Also disclosed are the related methods for chemical detection.Type: GrantFiled: March 13, 2014Date of Patent: March 21, 2017Assignee: The United States of America as represented by the Secretary of the NavyInventors: R. Andrew McGill, Robert Furstenberg, Viet K. Nguyen, Chris Kendziora, Michael Papantonakis, Todd H. Stievater
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Publication number: 20160273912Abstract: A method and system described for sensing a displacement by receiving and propagating a laser light signal with an etched waveguide that is configured to enable an evanescent optical field above the waveguide surface. A movable perturber can be positioned so the perturber interacts with the evanescent optical field above the waveguide surface. An optical phase shift can be induced in the waveguide when the movable perturber is displaced in the evanescent optical field, and the optical phase shift can be measured with an optical readout circuit.Type: ApplicationFiled: May 31, 2016Publication date: September 22, 2016Inventors: Marcel W. Pruessner, Todd H. Stievater, William S. Rabinovich
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Patent number: 9395177Abstract: A method and system described for sensing a displacement by receiving and propagating a laser light signal with an etched waveguide that is configured to enable an evanescent optical field above the waveguide surface. A movable perturber can be positioned so the perturber interacts with the evanescent optical field above the waveguide surface. An optical phase shift can be induced in the waveguide when the movable perturber is displaced in the evanescent optical field, and the optical phase shift can be measured with an optical readout circuit.Type: GrantFiled: November 12, 2014Date of Patent: July 19, 2016Assignee: The United States of America, as represented by the Secretary of the NavyInventors: Marcel W. Pruessner, Todd H. Stievater, William S. Rabinovich
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Patent number: 9335271Abstract: A mass sensor system including multiple Fabry-Perot microcavities connected in parallel by multiple waveguides. Each of the mass sensors includes a microbridge having a fundamental resonance frequency, and a movable reflective mirror etched into the microbridge; a fixed reflective mirror etched in a substrate, the fixed reflective mirror being fixed to the substrate in a region spaced apart from the movable reflective mirror; and an optical waveguide etched in the substrate that connects the movable mirror and the fixed mirror forming the Fabry-Perot microcavity interferometer. The system includes a tunable continuous-wave laser operative to optically interrogate the Fabry-Perot microcavity of each of the plurality of mass sensors, and a receiver operative to receive sensor signals from each of the plurality of mass sensors, the sensor signals comprising reflective signals and transmitted signals.Type: GrantFiled: August 22, 2014Date of Patent: May 10, 2016Assignee: The Government of the United States of America, as represented by the Secretary of the NavyInventors: Marcel W. Pruessner, Todd H. Stievater, William S. Rabinovich
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Publication number: 20150323466Abstract: A mass sensor system including multiple Fabry-Perot microcavities connected in parallel by multiple waveguides. Each of the mass sensors includes a microbridge having a fundamental resonance frequency, and a movable reflective mirror etched into the microbridge; a fixed reflective mirror etched in a substrate, the fixed reflective mirror being fixed to the substrate in a region spaced apart from the movable reflective mirror; and an optical waveguide etched in the substrate that connects the movable mirror and the fixed mirror forming the Fabry-Perot microcavity interferometer. The system includes a tunable continuous-wave laser operative to optically interrogate the Fabry-Perot microcavity of each of the plurality of mass sensors, and a receiver operative to receive sensor signals from each of the plurality of mass sensors, the sensor signals comprising reflective signals and transmitted signals.Type: ApplicationFiled: August 22, 2014Publication date: November 12, 2015Applicant: The Government of the United States of America, as represented by the Secretary of the NavyInventors: Marcel W. Pruessner, Todd H. Stievater, William S. Rabinovich
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Patent number: 9057891Abstract: A waveguide device for frequency mixing or conversion through birefringent phase matching, having a horizontal waveguide suspended above a substrate. The waveguide is formed of a zinc blend type III-V semiconductor material with a high nonlinear susceptibility.Type: GrantFiled: April 22, 2013Date of Patent: June 16, 2015Assignee: The United States of America, as represented by the Secretary of the NavyInventors: Todd H. Stievater, Jacob B. Khurgin, Doewon Park, Marcel W. Pruessner, William S. Rabinovich, Rita Mahon
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Publication number: 20150131106Abstract: A method and system described for sensing a displacement by receiving and propagating a laser light signal with an etched waveguide that is configured to enable an evanescent optical field above the waveguide surface. A movable perturber can be positioned so the perturber interacts with the evanescent optical field above the waveguide surface. An optical phase shift can be induced in the waveguide when the movable perturber is displaced in the evanescent optical field, and the optical phase shift can be measured with an optical readout circuit.Type: ApplicationFiled: November 12, 2014Publication date: May 14, 2015Applicant: The Government of the United States of America, as represented by the Secretary of the NavyInventors: Marcel W. Pruessner, Todd H. Stievater, William S. Rabinovich
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Patent number: 8848197Abstract: A mass sensor system including multiple Fabry-Perot microcavities connected in parallel by multiple waveguides. Each of the mass sensors includes a microbridge having a fundamental resonance frequency, and a movable reflective mirror etched into the microbridge; a fixed reflective mirror etched in a substrate, the fixed reflective mirror being fixed to the substrate in a region spaced apart from the movable reflective mirror; and an optical waveguide etched in the substrate that connects the movable mirror and the fixed mirror forming the Fabry-Perot microcavity interferometer. The system includes a tunable continuous-wave laser operative to optically interrogate the Fabry-Perot microcavity of each of the plurality of mass sensors, and a receiver operative to receive sensor signals from each of the plurality of mass sensors, the sensor signals comprising reflective signals and transmitted signals.Type: GrantFiled: July 18, 2013Date of Patent: September 30, 2014Assignee: The United States of America, as represented by the Secretary of the NavyInventors: Marcel W. Pruessner, Todd H. Stievater, William S. Rabinovich