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公开(公告)号：US11635546B2
公开(公告)日：2023-04-25
申请号：US16624054
申请日：2018-06-28
Inventor： Hualiang Zhang , Jun Ding , Juejun Hu , Tian Gu , Hanyu Zheng
IPC: G02B1/00 , C23C14/04 , C23C14/06 , G02B5/20 , H01J37/317
Abstract: An optical device as described herein includes a host substrate fabricated from a dielectric material transparent in the Infrared range. Additionally, the optical device as discussed herein includes multiple elements disposed on the host substrate. The multiple elements are spaced apart from each other on the host substrate in accordance with a desired pattern. Each of the multiple elements disposed in the host substrate is fabricated from a second material having a refractive index of greater than 4.5. Such an optical device provides an improvement over conventional optical devices that operate in the Infrared range.
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公开(公告)号：US11313725B2
公开(公告)日：2022-04-26
申请号：US16928197
申请日：2020-07-14
Applicant: Massachusetts Institute of Technology
Inventor： Tian Gu , Derek Kita , Juejun Hu
Abstract: State-of-the-art portable Raman spectrometers use discrete free-space optical components that must be aligned well and that don't tolerate vibrations well. Conversely, the inventive spectrometers are made with monolithic photonic integration to fabricate some or all optical components on one or more planar substrates. Photonic integration enables dense integration of components, eliminates manual alignment and individual component assembly, and yields superior mechanical stability and resistance to shock or vibration. These features make inventive spectrometers especially suitable for use in high-performance portable or wearable sensors. They also yield significant performance advantages, including a large (e.g., 10,000-fold) increase in Raman scattering efficiency resulting from on-chip interaction of the tightly localized optical mode and the analyte and a large enhancement in spectral resolution and sensitivity resulting from the integration of an on-chip Fourier-transform spectrometer.
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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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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：US10852190B2
公开(公告)日：2020-12-01
申请号：US16506142
申请日：2019-07-09
Applicant: Massachusetts Institute of Technology
Inventor： Juejun Hu , Tian Gu , Hongtao Lin , Derek 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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Patent Agency Ranking
公开(公告)号：US10656443B2
公开(公告)日：2020-05-19
申请号：US15923986
申请日：2018-03-16
Inventor： Jifeng Liu , Xiaoxin Wang , Juejun Hu , Xiaochen Sun , Tian Gu
Abstract: An optical interconnect system has first and second waveguides each with wedge-shaped cross-section at a first end, disposed over an optical modulator. The optical modulator is a surface-plasmon multi quantum well (SP-MQW) modulator, the first waveguide an input waveguide and the second waveguide configured an output waveguide. In embodiments the SP-MQW modulator has multiple semiconductor layers disposed atop a lower metal layer between 10 and 300 nanometers thick and configured such that incident light is reflected at the lower metal layer unless a voltage is applied to the semiconductor layers, when incident light is coupled into a surface plasmon mode in the lower metal layer.
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公开(公告)号：US20200150311A1
公开(公告)日：2020-05-14
申请号：US16624054
申请日：2018-06-28
Inventor： Hualiang Zhang , Jun Ding , Juejun Hu , Tian Gu , Hanyu Zheng
Abstract: An optical device as described herein includes a host substrate fabricated from a dielectric material transparent in the Infrared range. Additionally, the optical device as discussed herein includes multiple elements disposed on the host substrate. The multiple elements are spaced apart from each other on the host substrate in accordance with a desired pattern. Each of the multiple elements disposed in the host substrate is fabricated from a second material having a refractive index of greater than 4.5. Such an optical device provides an improvement over conventional optical devices that operate in the Infrared range.
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公开(公告)号：US20190285473A1
公开(公告)日：2019-09-19
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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9.发明申请公开(公告)号：US20180267339A1
公开(公告)日：2018-09-20
申请号：US15923986
申请日：2018-03-16
Inventor： Jifeng Liu , Xiaoxin Wang , Juejun Hu , Xiaochen Sun , Tian Gu
IPC: G02F1/017
CPC classification number: G02F1/017 , G02F2001/0151 , G02F2001/0157 , G02F2202/101 , G02F2202/108 , G02F2203/10
Abstract: An optical interconnect system has first and second waveguides each with wedge-shaped cross-section at a first end, disposed over an optical modulator. The optical modulator is a surface-plasmon multi quantum well (SP-MQW) modulator, the first waveguide an input waveguide and the second waveguide configured an output waveguide. In embodiments the SP-MQW modulator has multiple semiconductor layers disposed atop a lower metal layer between 10 and 300 nanometers thick and configured such that incident light is reflected at the lower metal layer unless a voltage is applied to the semiconductor layers, when incident light is coupled into a surface plasmon mode in the lower metal layer.
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公开(公告)号：US10006809B2
公开(公告)日：2018-06-26
申请号：US15429321
申请日：2017-02-10
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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