Patents by Inventor Hengky Chandrahalim
Hengky Chandrahalim 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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Patent number: 11650370Abstract: The present invention relates to evanescently coupling whispering gallery mode optical resonators having a liquid coupling as well as methods of making and using same. The aforementioned evanescently coupling whispering gallery mode optical resonators having a liquid couplings provide increased tunability and sensing selectivity over current same. The aforementioned. Applicants' method of making evanescent-wave coupled optical resonators can be achieved while having coupling gap dimensions that can be fabricated using standard photolithography. Thus economic, rapid, and mass production of coupled WGM resonators-based lasers, sensors, and signal processors for a broad range of applications can be realized.Type: GrantFiled: October 21, 2021Date of Patent: May 16, 2023Assignee: United States of America as represented by the Secretary of the Air ForceInventors: Hengky Chandrahalim, Kyle T Bodily
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Publication number: 20230131116Abstract: The present invention relates to evanescently coupling whispering gallery mode optical resonators having a liquid coupling as well as methods of making and using same. The aforementioned evanescently coupling whispering gallery mode optical resonators having a liquid couplings provide increased tunability and sensing selectivity over current same. The aforementioned. Applicants' method of making evanescent-wave coupled optical resonators can be achieved while having coupling gap dimensions that can be fabricated using standard photolithography. Thus economic, rapid, and mass production of coupled WGM resonators-based lasers, sensors, and signal processors for a broad range of applications can be realized.Type: ApplicationFiled: October 21, 2021Publication date: April 27, 2023Inventors: Hengky Chandrahalim, Kyle T. Bodily
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Patent number: 11635315Abstract: A passive microscopic flow sensor includes a three-dimensional microscopic optical structure formed on a cleaved tip of an optical fiber. The three-dimensional microscopic optical structure includes a post attached off-center to and extending longitudinally from the cleaved tip of the optical fiber. A rotor of the three-dimensional microscopic optical structure is received for rotation on the post. The rotor has more than one blade. Each blade has a reflective undersurface that reflects a light signal back through the optical fiber when center aligned with the optical fiber, the blades of the rotor shaped to rotate at a rate related to a flow rate.Type: GrantFiled: April 30, 2021Date of Patent: April 25, 2023Assignee: United States of America as represented by the Secretary of the Air ForceInventors: Jeremiah C Williams, Hengky Chandrahalim
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Patent number: 11366054Abstract: An optoacoustic sensor includes a liquid crystal (LC) cell formed between top and bottom plates of transparent material. A transverse grating formed across the LC cell that forms an optical transmission bandgap. A CL is aligned to form a spring-like, tunable Bragg grating that is naturally responsive to external agitations providing a spectral transition regime, or edge, in the optical transmission bandgap of the transverse grating that respond to broadband acoustic waves. The optoacoustic sensor includes a narrowband light source that is oriented to transmit light through the top plate, the LC cell, and the bottom plate. The optoacoustic sensor includes an optoacoustic spectrometer that is oriented below the bottom plate to receive the transmitted light and to record a time-domain modulation of transmission intensity at a selected one of a falling and rising edge of the transmission bandgap for detecting analog acoustic vibration.Type: GrantFiled: February 5, 2020Date of Patent: June 21, 2022Assignee: United States of America as represented by the Secretary of the Air ForceInventors: Hengky Chandrahalim, Michael Dela Cruz
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Patent number: 11326970Abstract: A passive microscopic Fabry-Pérot Interferometer (FPI) pressure sensor includes an optical fiber and a three-dimensional microscopic optical enclosure. The three-dimensional microscopic optical enclosure includes tubular side walls having lateral pleated corrugations and attached to a cleaved tip of the optical fiber to receive a light signal. An optically reflecting end wall is distally engaged to the tubular side walls to enclose a trapped quantity of gas that longitudinally positions the optically reflecting end wall in relation to ambient air pressure, changing a distance traveled by a light signal reflected back through the optical fiber.Type: GrantFiled: April 14, 2021Date of Patent: May 10, 2022Assignee: United States of America as represented by the Secretary of the Air ForceInventors: Jeremiah C Williams, Hengky Chandrahalim
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Patent number: 11320596Abstract: A passive microscopic Fabry-Pérot Interferometer (FPI) sensor includes a three-dimensional microscopic optical structure formed on a cleaved tip of the optical fighter using a two-photon polymerization process on a photosensitive polymer by a three-dimensional micromachining device. The three-dimensional microscopic optical structure having a hinged optical layer pivotally connected to a distal portion of a suspended structure. A reflective layer is deposited on a mirror surface of the hinged optical layer while in an open position. The hinged optical layer is subsequently positioned in the closed position to align the mirror surface to at least partially reflect a light signal back through the optical fiber.Type: GrantFiled: April 22, 2021Date of Patent: May 3, 2022Assignee: United States of America as represented by the Secretary of the Air ForceInventors: Jeremiah Williams, Hengky Chandrahalim
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Patent number: 11287575Abstract: A method is provided for fabricating a passive optical sensor on a tip of an optical fiber. The method includes perpendicularly cleaving a tip of an optical fiber and mounting the tip of the optical fiber in a specimen holder of a photosensitive polymer three-dimensional micromachining machine. The method includes forming a three-dimensional microscopic optical structure within the photosensitive polymer that comprises a two cavity Fabry-Perot Interferometer (FPI) having a hinged optical layer that is pivotally coupled to a suspended structure. The method includes removing an uncured portion of the photosensitive polymer using a solvent. The method includes depositing a reflective layer on a mirror surface of the hinged optical layer. The method includes positioning the pivotally hinged optical layer to a closed position with the suspended structure, aligning the mirror surface with the cleaved tip of the optical fiber.Type: GrantFiled: April 21, 2021Date of Patent: March 29, 2022Assignee: United States of America as represented by the Secretary of the Air ForceInventors: Jeremiah C Williams, Hengky Chandrahalim
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Patent number: 11204468Abstract: A passive microscopic Fabry-Pérot Interferometer (FPI) sensor includes an optical fiber a three-dimensional microscopic optical structure formed on a cleaved tip of an optical fighter that reflects a light signal back through the optical fiber. The reflected light is altered by refractive index changes in the three-dimensional structure that is subject to at least one of: (i) thermal radiation; and (ii) volatile organic compounds.Type: GrantFiled: December 29, 2020Date of Patent: December 21, 2021Assignee: United States of America as represented by the Secretary of the Air ForceInventors: Hengky Chandrahalim, Jonathan Smith
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Patent number: 11156782Abstract: A method of making passive microscopic Fabry-Pérot Interferometer (FPI) sensor includes forming a three-dimensional microscopic optical structure on a cleaved tip of an optical fiber that reflects a light signal back through the optical fiber. The reflected light is altered by refractive index changes in the three-dimensional structure that is subject to at least one of: (i) thermal radiation; and (ii) volatile organic compounds.Type: GrantFiled: December 29, 2020Date of Patent: October 26, 2021Assignee: United States of America as represented by the Secretary of the Air ForceInventors: Hengky Chandrahalim, Jonathan Smith
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Publication number: 20210325270Abstract: A passive microscopic Fabry-Pérot Interferometer (FPI) pressure sensor includes an optical fiber and a three-dimensional microscopic optical enclosure. The three-dimensional microscopic optical enclosure includes tubular side walls having lateral pleated corrugations and attached to a cleaved tip of the optical fiber to receive a light signal. An optically reflecting end wall is distally engaged to the tubular side walls to enclose a trapped quantity of gas that longitudinally positions the optically reflecting end wall in relation to ambient air pressure, changing a distance traveled by a light signal reflected back through the optical fiber.Type: ApplicationFiled: April 14, 2021Publication date: October 21, 2021Inventors: Jeremiah Williams, Hengky Chandrahalim
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Publication number: 20210294039Abstract: A method is provided for fabricating a passive optical sensor on a tip of an optical fiber. The method includes perpendicularly cleaving a tip of an optical fiber and mounting the tip of the optical fiber in a specimen holder of a photosensitive polymer three-dimensional micromachining machine. The method includes forming a three-dimensional microscopic optical structure within the photosensitive polymer that comprises a two cavity Fabry-Perot Interferometer (FPI) having a hinged optical layer that is pivotally coupled to a suspended structure. The method includes removing an uncured portion of the photosensitive polymer using a solvent. The method includes depositing a reflective layer on a mirror surface of the hinged optical layer. The method includes positioning the pivotally hinged optical layer to a closed position with the suspended structure, aligning the mirror surface with the cleaved tip of the optical fiber.Type: ApplicationFiled: April 21, 2021Publication date: September 23, 2021Inventors: Jeremiah Q. Williams, Hengky Chandrahalim
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Publication number: 20210271027Abstract: A passive microscopic Fabry-Pérot Interferometer (FPI) sensor includes a three-dimensional microscopic optical structure formed on a cleaved tip of the optical fighter using a two-photon polymerization process on a photosensitive polymer by a three-dimensional micromachining device. The three-dimensional microscopic optical structure having a hinged optical layer pivotally connected to a distal portion of a suspended structure. A reflective layer is deposited on a mirror surface of the hinged optical layer while in an open position. The hinged optical layer is subsequently positioned in the closed position to align the mirror surface to at least partially reflect a light signal back through the optical fiber.Type: ApplicationFiled: April 22, 2021Publication date: September 2, 2021Inventors: Jeremiah Williams, Hengky Chandrahalim
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Publication number: 20210149116Abstract: A method of making passive microscopic Fabry-Pérot Interferometer (FPI) sensor includes forming a three-dimensional microscopic optical structure on a cleaved tip of an optical fiber that reflects a light signal back through the optical fiber. The reflected light is altered by refractive index changes in the three-dimensional structure that is subject to at least one of: (i) thermal radiation; and (ii) volatile organic compounds.Type: ApplicationFiled: December 29, 2020Publication date: May 20, 2021Inventors: Hengky Chandrahalim, Jonathan Smith
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Publication number: 20210116644Abstract: A passive microscopic Fabry-Pérot Interferometer (FPI) sensor includes an optical fiber a three-dimensional microscopic optical structure formed on a cleaved tip of an optical fighter that reflects a light signal back through the optical fiber. The reflected light is altered by refractive index changes in the three-dimensional structure that is subject to at least one of: (i) thermal radiation; and (ii) volatile organic compounds.Type: ApplicationFiled: December 29, 2020Publication date: April 22, 2021Inventors: Hengky Chandrahalim, Jonathan Smith
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Patent number: 10942313Abstract: A passive microscopic Fabry-Pérot Interferometer (FPI) sensor an optical fiber a three-dimensional microscopic optical structure formed on a cleaved tip of an optical fighter that reflects a light signal back through the optical fiber. The reflected light is altered by refractive index changes in the three-dimensional structure that is subject to at least one of: (i) thermal radiation; and (ii) volatile organic compounds.Type: GrantFiled: February 10, 2020Date of Patent: March 9, 2021Assignee: United States of America as represented by the Secretary of the Air ForceInventors: Hengky Chandrahalim, Jonathan Smith
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Publication number: 20200257049Abstract: A passive microscopic Fabry-Pérot Interferometer (FPI) sensor an optical fiber a three-dimensional microscopic optical structure formed on a cleaved tip of an optical fighter that reflects a light signal back through the optical fiber. The reflected light is altered by refractive index changes in the three-dimensional structure that is subject to at least one of: (i) thermal radiation; and (ii) volatile organic compounds.Type: ApplicationFiled: February 10, 2020Publication date: August 13, 2020Inventors: Hengky Chandrahalim, Jonathan Smith
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Publication number: 20200256787Abstract: An optoacoustic sensor includes a liquid crystal (LC) cell formed between top and bottom plates of transparent material. A transverse grating formed across the LC cell that forms an optical transmission bandgap. A CL is aligned to form a spring-like, tunable Bragg grating that is naturally responsive to external agitations providing a spectral transition regime, or edge, in the optical transmission bandgap of the transverse grating that respond to broadband acoustic waves. The optoacoustic sensor includes a narrowband light source that is oriented to transmit light through the top plate, the LC cell, and the bottom plate. The optoacoustic sensor includes an optoacoustic spectrometer that is oriented below the bottom plate to receive the transmitted light and to record a time-domain modulation of transmission intensity at a selected one of a falling and rising edge of the transmission bandgap for detecting analog acoustic vibration.Type: ApplicationFiled: February 5, 2020Publication date: August 13, 2020Inventors: Hengky Chandrahalim, Michael Dela Cruz
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Patent number: 8390398Abstract: A digitally-tunable RF MEMS filter includes a substrate and a plurality of mechanically coupled resonators, wherein a first and a last resonator of the plurality of mechanically coupled resonators are configured to be electrostatically transduced. One or more of the plurality of mechanically coupled resonators are configured to be biased relative to the substrate such that the one or more biased resonators may be brought substantially in contact with the substrate. In a method of digitally tuning an RF MEMS filter having a mechanically coupled resonator array, a DC bias voltage is applied to at least a first resonator and a last resonator of the mechanically coupled resonator array such that motional boundary conditions for the at least first resonator and last resonator are selectable in proportion to the DC bias voltage.Type: GrantFiled: October 29, 2009Date of Patent: March 5, 2013Assignee: Cornell Center for Technology, Enterprise and CommercializationInventors: Hengky Chandrahalim, Sunil Ashok Bhave
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Publication number: 20100171570Abstract: A digitally-tunable RF MEMS filter includes a substrate and a plurality of mechanically coupled resonators, wherein a first and a last resonator of the plurality of mechanically coupled resonators are configured to be electrostatically transduced. One or more of the plurality of mechanically coupled resonators are configured to be biased relative to the substrate such that the one or more biased resonators may be brought substantially in contact with the substrate. In a method of digitally tuning an RF MEMS filter having a mechanically coupled resonator array, a DC bias voltage is applied to at least a first resonator and a last resonator of the mechanically coupled resonator array such that motional boundary conditions for the at least first resonator and last resonator are selectable in proportion to the DC bias voltage.Type: ApplicationFiled: October 29, 2009Publication date: July 8, 2010Applicant: CORNELL UNIVERSITYInventors: Hengky CHANDRAHALIM, Sunil Ashok BHAVE