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    MINIATURIZED FOURIER-TRANSFORM RAMAN SPECTROMETER SYSTEMS AND METHODS
    1.
    发明申请
    MINIATURIZED FOURIER-TRANSFORM RAMAN SPECTROMETER SYSTEMS AND METHODS 审中-公开

    公开(公告)号：US20190049300A1

    公开(公告)日：2019-02-14

    申请号：US16058927

    申请日：2018-08-08

    申请人： Tian GU ,  Derek Matthew KITA ,  Juejun HU

    发明人： Tian GU ,  Derek Matthew KITA ,  Juejun HU

    IPC分类号： G01J3/44 ,  G01N21/65 ,  G01J3/453

    CPC分类号： G01J3/44 ,  G01J3/0218 ,  G01J3/0259 ,  G01J3/0272 ,  G01J3/453 ,  G01J3/4532 ,  G01N21/65

    摘要： 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.

    Ultra-Wide Field-of-View Flat Optics
    3.
    发明申请
    Ultra-Wide Field-of-View Flat Optics 有权

    公开(公告)号：US20210044748A1

    公开(公告)日：2021-02-11

    申请号：US16894945

    申请日：2020-06-08

    申请人： Juejun Hu ,  Tian GU ,  Mikhail Shalaginov

    发明人： Juejun Hu ,  Tian GU ,  Mikhail Shalaginov

    IPC分类号： H04N5/232 ,  G02B1/00 ,  G02B13/06

    摘要： 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.

    Chip-Scale Optical Coherence Tomography Engine
    7.
    发明申请
    Chip-Scale Optical Coherence Tomography Engine 有权

    公开(公告)号：US20210307603A1

    公开(公告)日：2021-10-07

    申请号：US17165001

    申请日：2021-02-02

    申请人： Juejun Hu ,  Tian GU ,  Derek Kita ,  Carlos Andres Rios Ocampo

    发明人： Juejun Hu ,  Tian GU ,  Derek Kita ,  Carlos Andres Rios Ocampo

    IPC分类号： A61B3/10 ,  G01B9/02 ,  G02B27/10

    摘要： 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.

    Integrated Freeform Optical Couplers
    8.
    发明申请
    Integrated Freeform Optical Couplers 审中-公开

    公开(公告)号：US20200225401A1

    公开(公告)日：2020-07-16

    申请号：US16685201

    申请日：2019-11-15

    申请人： Shaoliang YU ,  Haijie ZUO ,  Juejun Hu ,  Tian GU

    发明人： Shaoliang YU ,  Haijie ZUO ,  Juejun Hu ,  Tian GU

    IPC分类号： F21V8/00 ,  G02B6/12

    摘要： 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.