Patents by Inventor Nanfang Yu
Nanfang Yu 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: 11940616Abstract: A switchable light transmission module is disclosed that includes a substrate having a first surface defining at least part of an enclosed volume, a porous layer disposed on the first surface and in fluid communication with the enclosed volume, and a reservoir in fluid communication with the enclosed volume. The reservoir is configured to supply a fluid to the sealed volume such that the fluid contacts the porous layer. The fluid has a refractive index that is close to the refractive index of the porous layer, has a high wettability for the porous layer, and does not dissolve the porous layer. When in a dry state, voids in the porous layer are filled with air which has a much different refractive index than the porous layer itself, resulting in a surface that is reflective and not very transmissive.Type: GrantFiled: December 10, 2018Date of Patent: March 26, 2024Assignee: The Trustees of Columbia University in the City of New YorkInventors: Jyotirmoy Mandal, Yuan Yang, Nanfang Yu
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Publication number: 20240085690Abstract: A structured material is provided that includes a substrate and a porous structured polymer layer disposed thereon. The porous structured polymer layer includes a plurality of voids, and has a high hemispherical reflectance a high a hemispherical thermal emittance. The structured material is thus particularly advantageous for cool-roof coatings, enabling surfaces coated by the material to stay cool, even under strong sunlight. The material can be produced via structuring of polymers in a mixture including a solvent and a non-solvent. Sequential evaporation of the solvent and the non-solvent provide a polymer layer with the plurality of voids.Type: ApplicationFiled: August 8, 2023Publication date: March 14, 2024Applicant: THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORKInventors: Jyotirmoy MANDAL, Yuan YANG, Nanfang YU
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Patent number: 11906698Abstract: Techniques for creating a replacement for optical elements with diffractive planar components based on metasurfaces are provided. In one example, a substantially flat optical component for lensing incoming electromagnetic radiation having at least one wavelength and a first phase into outgoing electromagnetic radiation having a second phase is provided.Type: GrantFiled: November 22, 2019Date of Patent: February 20, 2024Assignee: THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORKInventors: Nanfang Yu, Adam Overvig, Sajan Shrestha
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Publication number: 20240011724Abstract: Devices for radiative cooling and optical waveguiding are provided, wherein the devices comprise a fabric including one or more fibers extending for a length in a longitudinal direction and a plurality of void structures positioned within each of the one or more fibers and extended over the length of each of the one or more fibers. Each of the plurality of void structures is configured to scatter at least a portion of an electromagnetic radiation received thereon to thereby radiatively cool the object.Type: ApplicationFiled: June 1, 2023Publication date: January 11, 2024Applicant: THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORKInventors: Nanfang Yu, Norman Shi, Meng Tian
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Publication number: 20230367144Abstract: The disclosed matter provides integrated metasurface devices for conversion between a waveguide mode and a free-space optical wave with a designer wavefront. In exemplary embodiments, the integrated metasurface devices include a thin waveguide, a waveguide taper, a leaky-wave metasurface defined within a high refractive index layer of dielectric material, and a low refractive index substrate. The device can manipulate all the four optical degrees of freedom of the free-space wavefront, namely: amplitude, phase, polarization orientation, and polarization ellipticity, by using a leaky-wave metasurface composed of meta-units with four structural degrees of freedom.Type: ApplicationFiled: May 16, 2023Publication date: November 16, 2023Applicant: THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORKInventors: Nanfang Yu, Andrea Alu, Heqing Huang, Yuan Xu, Adam Overvig
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Publication number: 20230368012Abstract: The disclosed subject matter provides systems and methods for processing light. An example system can include one or more substrates, and a plurality of meta-units, which are patterned on each of the substrates and configured to modify a phase, an amplitude, or a polarization of the light with a subwavelength resolution. The system can be in a form of a diffractive neural network and be configured to perform target recognition.Type: ApplicationFiled: May 15, 2023Publication date: November 16, 2023Applicants: THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORK, WISCONSIN ALUMNI RESEARCH FOUNDATIONInventors: Nanfang Yu, Cheng-Chia Tsai, Xiaoyan Huang, Zongfu Yu, Zhicheng Wu
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Patent number: 11740450Abstract: A structured material is provided that includes a substrate and a porous structured polymer layer disposed thereon. The porous structured polymer layer includes a plurality of voids, and has a high hemispherical reflectance a high a hemispherical thermal emittance. The structured material is thus particularly advantageous for cool-roof coatings, enabling surfaces coated by the material to stay cool, even under strong sunlight. The material can be produced via structuring of polymers in a mixture including a solvent and a non-solvent. Sequential evaporation of the solvent and the non-solvent provide a polymer layer with the plurality of voids.Type: GrantFiled: December 10, 2018Date of Patent: August 29, 2023Assignee: The Trustees of Columbia University in the City of New YorkInventors: Jyotirmoy Mandal, Yuan Yang, Nanfang Yu
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Patent number: 11733455Abstract: The systems described herein can be used to modulate either the phase, the amplitude, or both of an input light wave using micro-resonators to achieve desired degrees and/or types of modulation.Type: GrantFiled: April 2, 2020Date of Patent: August 22, 2023Assignee: The Trustees of Columbia University in the City of New YorkInventors: Guozhen Liang, Heqing Huang, Michal Lipson, Nanfang Yu
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Patent number: 11703289Abstract: Devices for radiative cooling and optical waveguiding are provided, wherein the devices comprise a fabric including one or more fibers extending for a length in a longitudinal direction and a plurality of void structures positioned within each of the one or more fibers and extended over the length of each of the one or more fibers. Each of the plurality of void structures is configured to scatter at least a portion of an electromagnetic radiation received thereon to thereby radiatively cool the object.Type: GrantFiled: February 18, 2020Date of Patent: July 18, 2023Assignee: THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORKInventors: Nanfang Yu, Norman Shi, Meng Tian
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Patent number: 11675219Abstract: The disclosed subject matter provides systems and methods for spatial and spectral modulation of light. An example system for modulating light can include a substrate and a plurality of meta units, coupled to the substrate and configured to spatially and spectrally modulate the light, wherein the plurality of meta units includes a perturbation and forms a perturbed lattice supporting a quasi-bound state in the continuum.Type: GrantFiled: December 3, 2020Date of Patent: June 13, 2023Assignee: THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORKInventors: Nanfang Yu, Adam Overvig, Stephanie Malek
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Patent number: 11668497Abstract: Systems and methods for radiative cooling and heating are provided. For example, systems for radiative cooling can include a top layer including one or more polymers, where the top layer has high emissivity in at least a portion of the thermal spectrum and an electromagnetic extinction coefficient of approximately zero, absorptivity of approximately zero, and high transmittance in at least a portion of the solar spectrum, and further include a reflective layer including one or more metals, where the reflective layer has high reflectivity in at least a portion of the solar spectrum.Type: GrantFiled: March 21, 2022Date of Patent: June 6, 2023Assignee: THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORKInventors: Nanfang Yu, Jyotirmoy Mandal, Adam Overvig, Norman Nan Shi, Meng Tian
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Publication number: 20220308370Abstract: The systems described herein can be used to modulate either the phase, the amplitude, or both of an input light wave using micro-resonators to achieve desired degrees and/or types of modulation.Type: ApplicationFiled: April 2, 2020Publication date: September 29, 2022Applicant: THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORKInventors: Guozhen Liang, Heqing Huang, Michal Lipson, Nanfang Yu
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Publication number: 20220252309Abstract: Systems and methods for radiative cooling and heating are provided. For example, systems for radiative cooling can include a top layer including one or more polymers, where the top layer has high emissivity in at least a portion of the thermal spectrum and an electromagnetic extinction coefficient of approximately zero, absorptivity of approximately zero, and high transmittance in at least a portion of the solar spectrum, and further include a reflective layer including one or more metals, where the reflective layer has high reflectivity in at least a portion of the solar spectrum.Type: ApplicationFiled: March 21, 2022Publication date: August 11, 2022Applicant: THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORKInventors: Nanfang Yu, Jyotirmoy Mandal, Adam Overvig, Norman Nan Shi, Meng Tian
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Patent number: 11306949Abstract: Systems and methods for radiative cooling and heating are provided. For example, systems for radiative cooling can include a top layer including one or more polymers, where the top layer has high emissivity in at least a portion of the thermal spectrum and an electromagnetic extinction coefficient of approximately zero, absorptivity of approximately zero, and high transmittance in at least a portion of the solar spectrum, and further include a reflective layer including one or more metals, where the reflective layer has high reflectivity in at least a portion of the solar spectrum.Type: GrantFiled: June 25, 2019Date of Patent: April 19, 2022Assignee: THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORKInventors: Nanfang Yu, Jyotirmoy Mandal, Adam Overvig, Norman Nan Shi, Meng Tian
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Patent number: 11256112Abstract: Methods, systems, and devices are described for electro-optic tuning. An example device may comprise a first layer comprising a transition metal di-chalcogenide material, a second layer comprising a conductive material, and a third layer comprising a dielectric material. The third layer may be disposed at least partially between the first layer and the second layer. An electrical potential difference applied between the first layer and the second layer may cause a tunable refractive index change in the first layer.Type: GrantFiled: February 21, 2019Date of Patent: February 22, 2022Assignee: The Trustees of Columbia University in the City of New YorkInventors: Michal Lipson, James Hone, Nanfang Yu, Ipshita Datta, Sanghoon Chae, Gaurang R Bhatt, Dmitri N Basov
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Publication number: 20210171731Abstract: A structured material is provided that includes a substrate and a porous structured polymer layer disposed thereon. The porous structured polymer layer includes a plurality of voids, and has a high hemispherical reflectance a high a hemispherical thermal emittance. The structured material is thus particularly advantageous for cool-roof coatings, enabling surfaces coated by the material to stay cool, even under strong sunlight. The material can be produced via structuring of polymers in a mixture including a solvent and a non-solvent. Sequential evaporation of the solvent and the non-solvent provide a polymer layer with the plurality of voids.Type: ApplicationFiled: December 10, 2018Publication date: June 10, 2021Applicant: THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORKInventors: Jyotirmoy MANDAL, Yuan YANG, Nanfang YU
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Publication number: 20210165206Abstract: A switchable light transmission module is disclosed that includes a substrate having a first surface defining at least part of an enclosed volume, a porous layer disposed on the first surface and in fluid communication with the enclosed volume, and a reservoir in fluid communication with the enclosed volume. The reservoir is configured to supply a fluid to the sealed volume such that the fluid contacts the porous layer. The fluid has a refractive index that is close to the refractive index of the porous layer, has a high wettability for the porous layer, and does not dissolve the porous layer. When in a dry state, voids in the porous layer are filled with air which has a much different refractive index than the porous layer itself, resulting in a surface that is reflective and not very transmissive.Type: ApplicationFiled: December 10, 2018Publication date: June 3, 2021Applicant: THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORKInventors: Jyotirmoy MANDAL, Yuan YANG, Nanfang YU
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Publication number: 20200272100Abstract: Systems and methods for controlling optical amplitude and phase of incident electromagnetic are provided, wherein an exemplary system comprises a substrate and a plurality of meta units, attached to the top surface of the substrate and configured to convert the incident electromagnetic radiation into a target electromagnetic radiation by modifying both optical amplitude and phase.Type: ApplicationFiled: February 14, 2020Publication date: August 27, 2020Applicant: THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORKInventors: Nanfang Yu, Adam Overvig, Sajan Shrestha
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Publication number: 20200271400Abstract: Devices for radiative cooling and optical waveguiding are provided, wherein the devices comprise a fabric including one or more fibers extending for a length in a longitudinal direction and a plurality of void structures positioned within each of the one or more fibers and extended over the length of each of the one or more fibers. Each of the plurality of void structures is configured to scatter at least a portion of an electromagnetic radiation received thereon to thereby radiatively cool the object.Type: ApplicationFiled: February 18, 2020Publication date: August 27, 2020Applicant: THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORKInventors: Nanfang Yu, Norman Shi, Meng Tian
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Patent number: 10712224Abstract: Systems and methods for detecting a change in at least one physical parameter of a target illuminated by electromagnetic radiation are disclosed herein. The system includes one or more optical fibers, an optical switch, and a photo detector. The optical fiber switch can transmit at least a portion of the electromagnetic radiation into the one or more optical fibers. The optical fibers can have a plurality of sensor nodes. The sensor nodes can induce an interaction between the change in the at least one physical parameter and the transmitted electromagnetic radiation to generate an optical signal. The photo detector can be connected to the one or more optical fibers and measure the optical signal.Type: GrantFiled: May 21, 2018Date of Patent: July 14, 2020Assignee: THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORKInventors: Nanfang Yu, Meng Tian