公开(公告)号：US11906698B2

公开(公告)日：2024-02-20

申请号：US16692551

申请日：2019-11-22

申请人： THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORK

发明人： Nanfang Yu ,  Adam Overvig ,  Sajan Shrestha

IPC分类号： G02B1/00 ,  G02B27/00 ,  G02B1/02 ,  G02B5/18

CPC分类号： G02B1/002 ,  G02B1/02 ,  G02B5/1842 ,  G02B5/1857 ,  G02B27/0037

摘要： 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.

公开(公告)号：US11733455B2

公开(公告)日：2023-08-22

申请号：US16838714

申请日：2020-04-02

申请人： THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORK

发明人： Guozhen Liang ,  Heqing Huang ,  Michal Lipson ,  Nanfang Yu

IPC分类号： G02B6/12 ,  G02B6/293 ,  B82Y20/00 ,  G02F1/035 ,  G02B6/122 ,  G02F1/01 ,  G02F1/21 ,  G02F1/225

CPC分类号： G02B6/12007 ,  B82Y20/00 ,  G02B6/1228 ,  G02B6/29341 ,  G02F1/0147 ,  G02F1/035 ,  G02F1/212 ,  G02F1/225 ,  G02F2201/30 ,  G02F2202/20 ,  G02F2202/32 ,  G02F2203/50

摘要： 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.

公开(公告)号：US11675219B1

公开(公告)日：2023-06-13

申请号：US17110846

申请日：2020-12-03

申请人： THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORK

发明人： Nanfang Yu ,  Adam Overvig ,  Stephanie Malek

IPC分类号： G02F1/01 ,  G02B1/00 ,  G02F1/00

CPC分类号： G02F1/0121 ,  G02B1/005 ,  G02F1/0054 ,  G02F2202/32 ,  G02F2203/15

摘要： 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.

公开(公告)号：US11256112B2

公开(公告)日：2022-02-22

申请号：US16282013

申请日：2019-02-21

申请人： The Trustees of Columbia University in the City of New York

发明人： Michal Lipson ,  James Hone ,  Nanfang Yu ,  Ipshita Datta ,  Sanghoon Chae ,  Gaurang R Bhatt ,  Dmitri N Basov

IPC分类号： G02F1/01

摘要： 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.

公开(公告)号：US20230367144A1

公开(公告)日：2023-11-16

申请号：US18318231

申请日：2023-05-16

申请人： THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORK

发明人： Nanfang Yu ,  Andrea Alu ,  Heqing Huang ,  Yuan Xu ,  Adam Overvig

IPC分类号： G02F1/01 ,  G02B6/122 ,  G02B1/00 ,  B82Y20/00

CPC分类号： G02F1/0113 ,  G02F1/0139 ,  G02B6/1223 ,  G02B6/1228 ,  G02B6/1225 ,  G02B1/005 ,  B82Y20/00 ,  G02B2006/12085

摘要： 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.

公开(公告)号：US20220252309A1

公开(公告)日：2022-08-11

申请号：US17699789

申请日：2022-03-21

申请人： THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORK

发明人： Nanfang Yu ,  Jyotirmoy Mandal ,  Adam Overvig ,  Norman Nan Shi ,  Meng Tian

IPC分类号： F25B23/00 ,  F24S70/225 ,  F24S70/30 ,  F24S70/60 ,  B32B27/18 ,  B32B27/28 ,  B32B33/00

摘要： 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.

公开(公告)号：US20180335362A1

公开(公告)日：2018-11-22

申请号：US15985370

申请日：2018-05-21

申请人： THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORK

发明人： Nanfang Yu ,  Meng Tian

IPC分类号： G01M3/04 ,  G01K11/32 ,  G01L1/24 ,  G01M3/38

CPC分类号： G01M3/04 ,  G01K11/32 ,  G01L1/242 ,  G01M3/38

摘要： 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.

公开(公告)号：US20180059440A1

公开(公告)日：2018-03-01

申请号：US15689884

申请日：2017-08-29

申请人： THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORK

发明人： Nanfang Yu ,  Zhaoyi Li

IPC分类号： G02F1/00 ,  G02F1/15 ,  G02F1/153 ,  G02F1/29 ,  G11C13/04

CPC分类号： G02F1/0018 ,  G02F1/1523 ,  G02F1/1533 ,  G02F1/29 ,  G02F2001/164 ,  G02F2201/122 ,  G02F2202/30 ,  G02F2203/01 ,  G02F2203/10 ,  G02F2203/11 ,  G11C11/56 ,  G11C13/0016 ,  G11C13/04 ,  G11C13/048

摘要： Active photonic devices based on correlated perovskites are disclosed. Systems and methods using such active photonic devices are also disclosed. In one example, a smart window including an active photonic device is disclosed. In another example, a variable emissivity coating including an active photonic device is disclosed. In yet another example, an optical memory device including an active photonic device is disclosed. In a further example, an optical modulator including an active photonic device is disclosed. In an additional example, a tunable optical filter including an active photonic device is disclosed. In an additional example, a directional optical coupler including an active photonic device is disclosed.

公开(公告)号：US20240011724A1

公开(公告)日：2024-01-11

申请号：US18327184

申请日：2023-06-01

申请人： THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORK

发明人： Nanfang Yu ,  Norman Shi ,  Meng Tian

IPC分类号： F28F13/00 ,  D01D5/06 ,  D01D5/16 ,  D01D5/247 ,  D01F1/04 ,  D01F2/00 ,  D01F4/02 ,  D01F6/12 ,  G02B6/10 ,  B82Y30/00 ,  D01D1/10 ,  D06M11/00 ,  D01D1/06 ,  D01F1/06 ,  D01F1/10

CPC分类号： F28F13/003 ,  D01D5/06 ,  D01D5/16 ,  D01D5/247 ,  D01F1/04 ,  D01F2/00 ,  D01F4/02 ,  D01F6/12 ,  G02B6/10 ,  B82Y30/00 ,  D01D1/106 ,  D06M11/00 ,  D01D1/06 ,  D01F1/06 ,  D01F1/106 ,  F28F2245/06 ,  Y10T428/25 ,  D10B2401/022 ,  D10B2403/02421 ,  Y10T428/2915 ,  D10B2401/22

摘要： 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.

公开(公告)号：US11740450B2

公开(公告)日：2023-08-29

申请号：US16770277

申请日：2018-12-10

申请人： THE TRUSTEES OF COLUMBIA UNIVERSITY IN THE CITY OF NEW YORK

发明人： Jyotirmoy Mandal ,  Yuan Yang ,  Nanfang Yu

IPC分类号： G02B1/14 ,  G02B26/00 ,  C09D5/33 ,  E04D13/00 ,  E04F13/08 ,  E06B9/24 ,  C08J9/28 ,  C08K5/00 ,  E04D7/00 ,  G02B5/20

CPC分类号： G02B26/004 ,  C08J9/286 ,  C08K5/0041 ,  C09D5/004 ,  E04D7/00 ,  E04D13/00 ,  E04F13/08 ,  E06B9/24 ,  G02B1/14 ,  G02B5/208 ,  B32B2305/026 ,  C08J2301/12 ,  C08J2301/28 ,  C08J2325/06 ,  C08J2327/06 ,  C08J2327/14 ,  C08J2327/20 ,  C08J2383/04 ,  E06B2009/2411 ,  E06B2009/2417

摘要： 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.