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公开(公告)号：US11850001B2
公开(公告)日：2023-12-26
申请号：US17556884
申请日：2021-12-20
Applicant: Massachusetts Institute of Technology
Inventor： Juejun Hu , Tian Gu , Mikhail Shalaginov , Fan Yang
CPC classification number: A61B3/14 , A61B3/12 , G02B1/002 , G02B27/0093 , G02B27/0172 , G06F3/013 , A61B3/113 , G02B2027/0123 , G02B2027/0147
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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公开(公告)号：US11690513B2
公开(公告)日：2023-07-04
申请号：US16481710
申请日：2018-02-13
Applicant: Massachusetts Institute of Technology
IPC: A61B5/00 , A61B5/024 , A61B5/08 , A61B5/1455
CPC classification number: A61B5/0059 , A61B5/02416 , A61B5/0816 , A61B5/14551 , A61B2562/0238 , A61B2562/043
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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公开(公告)号：US11564565B2
公开(公告)日：2023-01-31
申请号：US17165001
申请日：2021-02-02
Applicant: Massachusetts Institute of Technology
Inventor： Juejun Hu , Tian Gu , Derek Kita , Carlos Andres Rios Ocampo
IPC: G01B11/02 , A61B3/10 , G02B27/10 , G01B9/02091
Abstract: An optical coherence tomography (OCT) engine includes a digital Fourier-Transform (dFT) spectrometer, a tunable delay line, and a high-speed optical phased array (OPA) scanner integrated onto a single chip. The broadband dFT spectrometer offers superior signal-to-noise ratio (SNR) and fine axial resolution; the tunable delay line ensures large imaging depth by circumventing sensitivity roll-off; and the OPA can scan the beams at GHz rates without moving parts. Unlike conventional spectrometers, the dFT spectrometer employs an optical switch network to retrieve spectral information in an exponentially scaling fashion—its performance doubles with every new optical switch added to the network. Moreover, it also benefits from the Fellgett's advantage, which provide a significant SNR edge over conventional spectrometers. The tunable delay line balances the path length difference between the reference and sample arms, avoiding any need to sample high-frequency spectral fringes.
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公开(公告)号：US11378733B2
公开(公告)日：2022-07-05
申请号：US16685201
申请日：2019-11-15
Applicant: Massachusetts Institute of Technology
Inventor： Shaoliang Yu , Haijie Zuo , Juejun Hu , Tian Gu
Abstract: Reflecting light beams off of microscale three-dimensional (3D) freeform surfaces can yield highly efficient coupling into and out of optical waveguides, optical fibers, and photonic chips. The structure of the 3D freeform reflective surface determines the shape of the reflected beam. This allows freeform reflectors to control the mode profile, rotation angle, and divergence angle of light beams. Control of beam shape enables mode matching between source output mode and target input mode, which results in low-loss optical coupling. An inventive freeform reflective surface can direct light beams in plane or out of plane via specular reflection or total internal reflection. A photonic integrated circuit with this type of freeform optical coupler can operate with a bandwidth range of at least 400 nm, potentially encompassing all visible or telecommunications wavelengths, and can be volume manufactured in photonic chips.
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公开(公告)号：US20200285083A1
公开(公告)日：2020-09-10
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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Patent Agency Ranking
公开(公告)号：US10571335B2
公开(公告)日：2020-02-25
申请号：US16275747
申请日：2019-02-14
Applicant: Massachusetts Institute of Technology
Inventor： Juejun Hu , Tian Gu , Kazumi Wada , Anuradha Murthy Agarwal , Lionel Cooper Kimerling , Derek Kita , Junying Li , Fleur Jacolien Fok
Abstract: An apparatus for generating a spectral image includes a filter to receive incident light. The filter has a variable refractive index. The apparatus also includes a modulator, operably coupled to the filter, to modulate the variable refractive index of the filter so as to generate a plurality of optical patterns from the incident light. The plurality of optical patterns represents the spectral image and each optical pattern in the plurality of optical patterns corresponds to a different modulation of the variable refractive index. The apparatus further includes a detector, in optical communication with the filter, to detect the plurality of optical patterns.
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公开(公告)号：US10386237B2
公开(公告)日：2019-08-20
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
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：US11885684B2
公开(公告)日：2024-01-30
申请号：US17243157
申请日：2021-04-28
Applicant: Massachusetts Institute of Technology
Inventor： Juejun Hu , Derek Kita , Jerome Michon
CPC classification number: G01J3/4406 , G01J3/0205 , G01J3/0218 , G01J3/10 , G01N21/65
Abstract: A method of performing Raman spectroscopy can include guiding a Raman pump beam with an optical fiber, where the Raman pump beam inducing fluorescence in the optical fiber. The beam and the fluorescence are coupled to a photonic integrated circuit (PIC) via the fiber. The beam is used to excite a sample in optical communication with the PIC via evanescent coupling and induces Raman scattering in the sample. The Raman scattering is collected via the PIC, and the Raman pump beam as well as the fluorescence is filtered out from the Raman scattering via the PIC.
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公开(公告)号：US20230393357A1
公开(公告)日：2023-12-07
申请号：US18329059
申请日：2023-06-05
Applicant: Massachusetts Institute of Technology
Inventor： Luigi Ranno , Tian GU , Juejun Hu
CPC classification number: G02B6/43 , G02B6/4219
Abstract: The present technology is related to optics and optical systems, particularly to photonic packaging, optical coupling, optical interconnects, micro-optics, and their fabrication. The present technology includes free-form micro-optical coupler architectures and systems with superb optical performance and a high-throughput method of fabricating large-area coupler arrays for scalable manufacturing. Embodiments include chip-to-fiber-array, chip-to-chip, chip-to-interposer, and chip-to-free-space couplers for applications including photonic packaging, optical communications, LiDAR, optical trapping and manipulation, augmented reality, virtual reality, and sensing.
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公开(公告)号：US11320647B2
公开(公告)日：2022-05-03
申请号：US16263071
申请日：2019-01-31
Applicant: Massachusetts Institute of Technology
Inventor： Jeffrey Chou , Vladimir Liberman , Juejun Hu , Yifei Zhang , William Herzog , Jason Stewart , Christopher Roberts
Abstract: Alloys of GeSbSeTe (GSST) can be used to make actively tunable infrared transmission filters that are small, fast, and solid-state. These filters can be used for hyperspectral imaging, 3D LIDAR, portable bio/chem sensing systems, thermal emission control, and tunable filters. GSST is a low-loss phase-change material that can switch from a low-index (n=3), amorphous state to a high-index (n=4.5), hexagonal state with low loss (k
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