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公开(公告)号：US11885677B2
公开(公告)日：2024-01-30
申请号：US17227440
申请日：2021-04-12
Applicant: Massachusetts Institute of Technology
Inventor： Derek Kita , Carlos Andres Rios Ocampo , Juejun Hu
CPC classification number: G01J3/0256 , G01J3/0205 , G01J3/0213 , G01J3/45 , G01J3/4531 , G01J3/4532 , G02F1/212
Abstract: We disclose an on-chip photonic spectroscopy system capable of dramatically improving the signal-to-noise ratio (SNR), dynamic range, and reconstruction quality of Fourier transform spectrometers. Secondly, we disclose a system of components that makes up a complete on-chip RF spectrum analyzer with low-cost and high-performance.
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公开(公告)号：US20210306564A1
公开(公告)日：2021-09-30
申请号：US17209496
申请日：2021-03-23
Applicant: Massachusetts Institute of Technology
Inventor： Juejun Hu , Tian GU , Mikhail Shalaginov
Abstract: Wide-angle optical functionality is beneficial for imaging and image projection devices. Conventionally, wide-angle operation is attained by a complicated assembly of optical elements. Recent advances have led to meta-surface lenses or meta-lenses, which are ultra-thin planar lenses with nanoantennas that control the phase, amplitude, and/or polarization of light. Here, we present a meta-lens capable of diffraction-limited focusing and imaging over an unprecedented >170° angular field of view (FOV). The lens is integrated on a one-piece flat substrate and includes an aperture on one side and a single meta-surface on the other side. The meta-surface corrects third-order Seidel aberrations, including coma, astigmatism, and field curvature. The meta-lens has a planar focal plane, which enables considerably simplified system architectures for imaging and projection. The meta-lens design is generic and can be readily adapted to different meta-atom geometries and wavelength ranges to meet diverse application demands.
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公开(公告)号：US20210239526A1
公开(公告)日：2021-08-05
申请号：US17227440
申请日：2021-04-12
Applicant: Massachusetts Institute of Technology
Inventor： Derek Kita , Carlos Andres Rios Ocampo , Juejun Hu
Abstract: We disclose an on-chip photonic spectroscopy system capable of dramatically improving the signal-to-noise ratio (SNR), dynamic range, and reconstruction quality of Fourier transform spectrometers. Secondly, we disclose a system of components that makes up a complete on-chip RF spectrum analyzer with low-cost and high-performance.
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公开(公告)号：US10983003B2
公开(公告)日：2021-04-20
申请号：US16710621
申请日：2019-12-11
Applicant: Massachusetts Institute of Technology
Inventor： Derek Kita , Carlos Andres Rios Ocampo , Juejun Hu
Abstract: We disclose an on-chip photonic spectroscopy system capable of dramatically improving the signal-to-noise ratio (SNR), dynamic range, and reconstruction quality of Fourier transform spectrometers. Secondly, we disclose a system of components that makes up a complete on-chip RF spectrum analyzer with low-cost and high-performance.
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公开(公告)号：US20190387972A1
公开(公告)日：2019-12-26
申请号：US16481710
申请日：2018-02-13
Applicant: Massachusetts Institute of Technology
IPC: A61B5/00
Abstract: A sensor, such as a photoplethysmography sensor, for non-invasively monitoring a characteristic of an organism, such as a vital body sign. The sensor has multiple light sources disposed on a substrate and an array of optical probing channels for conveying light from the light sources to a probed region. Each detector pixel of an array of detector pixels receives light from a respective optical detection channel after interaction with a subregion of the probed region and spatial filtering, and generates a corresponding pixel signal. A processor derives a value of the vital body sign based at least upon the plurality of pixel signals
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Patent Agency Ranking
公开(公告)号：US20180274981A1
公开(公告)日：2018-09-27
申请号：US15986098
申请日：2018-05-22
Applicant: Massachusetts Institute of Technology
Inventor： Juejun Hu , Tian Gu , Hongtao Lin , Derek Matthew Kita , Anuradha M. Agarwal
CPC classification number: G01J3/4531 , G01J3/0218 , G02F1/313 , G02F1/3136 , G02F2001/311
Abstract: A spectrometer includes an interferometer having a first interference arm and a second interference arm to produce interference patterns from incident light. At least one of the interference arms includes a series of cascaded optical switches connected by two (or more) waveguides of different lengths. Each optical switch directs the incident light into one waveguide or another, thereby changing the optical path length difference between the first interference arm and the second interference arm. This approach can be extended to multi-mode incident light by placing parallel interferometers together, each of which performs spectroscopy of one single mode in the multi-mode incident light. To maintain the compactness of the spectrometer, adjacent interferometers can share one interference arm.
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公开(公告)号：US20180140172A1
公开(公告)日：2018-05-24
申请号：US15873203
申请日：2018-01-17
Applicant: Massachusetts Institute of Technology
CPC classification number: A61B1/042 , A61B1/0669 , A61B1/0684 , A61B1/07 , A61N5/0622 , A61N2005/063 , A61N2005/0652 , G02B6/0038 , G02B6/0048 , G02B6/005 , G02B6/0053 , G02B6/0078 , G02B23/2469 , G02B23/26
Abstract: A multi-channel optical imaging and stimulation system includes a light source to deliver light beams into a light guide. Different light beams are coupled into different spatial modes supported by the light guide. The light guide includes multiple segments, each of which defines a window to couple a specified group of spatial modes out of the light guide to illuminate or stimulate a target. Light reflected, scattered, or emitted by the target is also collected by the windows in the light guide. The light collected by different windows is detected by different pixels of a detector, thereby creating a correspondence between the pixel location and the spatial location of site at which the light is collected. An image of the target is then reconstructed based on this correspondence.
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公开(公告)号：US20240418907A1
公开(公告)日：2024-12-19
申请号：US18714483
申请日：2022-09-29
Applicant: Juejun HU , Tian GU , Fan YANG , Sensong AN , Hung-I LIN , Massachusetts Institute of Technology
Inventor： Juejun Hu , Tian GU , Fan YANG , Sensong AN , Hung-I LIN
IPC: G02B1/00 , G02F1/01 , H04N13/239 , H04N13/254 , H04N23/958
Abstract: Meta-optic systems are described that include multi-function metasurfaces formed from a plurality of meta-atoms. A multi-function metasurface can exhibit two or more different optical functions for two or more different states of light incident on the metasurface. Different states of light include different polarizations, different wavelengths, and different angles of incidence. Different optical functions include distance sensing, converging, diverging, image formation, and patterned light formation. The multi-function metasurface can selectively impart different phase profiles to an incident beam depending on the incident beam's state of light.
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公开(公告)号：US11231603B2
公开(公告)日：2022-01-25
申请号：US16826489
申请日：2020-03-23
Applicant: Massachusetts Institute of Technology
Inventor： Zhuoran Fang , Tian Gu , Juejun Hu , Junying Li , Yifei Zhang
Abstract: An alloy of GexSbySezTem includes atoms of Ge, Sb, Se, and Te that form a crystalline structure having a plurality of vacancies randomly distributed in the crystalline structure. The alloy can be used to construct an optical device including a first waveguide to guide a light beam and a modulation layer disposed on the first waveguide. The modulation includes the alloy of GexSbySezTem which has a first refractive index n1 in an amorphous state and a second refractive index n2, greater than the first refractive index by at least 1, in a crystalline state. The first waveguide and the modulation layer are configured to guide about 1% to about 50% of the light beam in the modulation layer when the alloy is in the amorphous state and guide no optical mode when the alloy is in the crystalline state.
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公开(公告)号：US11206978B2
公开(公告)日：2021-12-28
申请号：US17164425
申请日：2021-02-01
Applicant: Massachusetts Institute of Technology
Inventor： Juejun Hu , Tian Gu , Mikhail Shalaginov , Fan Yang
Abstract: Meta-lens based ocular imaging, near-eye display, and eye-tracking systems are described. The systems can include a single focusing optic and an integrated circuit that provides illumination light and includes an imaging array. The focusing optic includes meta-atoms formed on a substrate. The systems may have no moving parts and achieve imaging or image-projection fields-of-view approaching or exceeding 180 degrees. Because of their low part count, the systems can be robust and have a very small form factor.
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