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公开(公告)号：US20220034715A1
公开(公告)日：2022-02-03
申请号：US17335299
申请日：2021-06-01
申请人： Rajeev J. RAM , Amir H. Atabaki , Nili Persits , Jaehwan Kim
发明人： Rajeev J. RAM , Amir H. Atabaki , Nili Persits , Jaehwan Kim
摘要： Swept-source Raman spectroscopy uses a tunable laser and a fixed-wavelength detector instead of a spectrometer or interferometer to perform Raman spectroscopy with the throughput advantage of Fourier transform Raman spectroscopy without bulky optics or moving mirrors. Although the tunable laser can be larger and more costly than a fixed wavelength diode laser used in other Raman systems, it is possible to split and switch the laser light to multiple ports simultaneously and/or sequentially. Each site can be monitored by its own fixed-wavelength detector. This architecture can be scaled by cascading fiber switches and/or couplers between the tunable laser and measurement sites. By multiplexing measurements at different sites, it is possible to monitor many sites at once. Moreover, each site can be meters to kilometers from the tunable laser. This makes it possible to perform swept-source Raman spectroscopy at many points across a continuous flow manufacturing environment with a single laser.
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公开(公告)号：US20210208470A1
公开(公告)日：2021-07-08
申请号：US17091905
申请日：2020-11-06
摘要： Optical read-out of a cryogenic device (such as a superconducting logic or detector element) can be performed with a forward-biased optical modulator that is directly coupled to the cryogenic device without any intervening electrical amplifier. Forward-biasing at cryogenic temperatures enables very high modulation efficiency (1,000-10,000 pm/V) of the optical modulator, and allows for optical modulation with millivolt driving signals and microwatt power dissipation in the cryogenic environment. Modulated optical signals can be coupled out of the cryostat via an optical fiber, reducing the thermal load on the cryostat. Using optical fiber instead of electrical wires can increase the communication bandwidth between the cryogenic environment and room-temperature environment to bandwidth densities as high as Tbps/mm2 using wavelength division multiplexing. Sensitive optical signals having higher robustness to noise and crosstalk, because of their immunity to electromagnetic interference, can be carried by the optical fiber.
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公开(公告)号：US20190195688A1
公开(公告)日：2019-06-27
申请号：US16229355
申请日：2018-12-21
CPC分类号： G01J3/0229 , G01J3/10 , G01J3/18 , G01J3/2803 , G01J3/44 , G01N21/65 , G01N2201/06113 , G01N2201/0635 , G01N2201/0638
摘要： In swept source Raman (SSR) spectroscopy, a swept laser beam illuminates a sample, which inelastically scatters some of the incident light. This inelastically scattered light is shifted in wavelength by an amount called the Raman shift. The Raman-shifted light can be measured with a fixed spectrally selective filter and a detector. The Raman spectrum can be obtained by sweeping the wavelength of the excitation source and, therefore, the Raman shift. The resolution of the Raman spectrum is determined by the filter bandwidth and the frequency resolution of the swept source. An SSR spectrometer can be smaller, more sensitive, and less expensive than a conventional Raman spectrometer because it uses a tunable laser and a fixed filter instead of free-space propagation for spectral separation. Its sensitivity depends on the size of the collection optics. And it can use a nonlinearly swept laser beam thanks to a wavemeter that measures the beam's absolute wavelength during Raman spectrum acquisition.
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公开(公告)号：US10656012B2
公开(公告)日：2020-05-19
申请号：US16229355
申请日：2018-12-21
IPC分类号： G01J3/44 , G01J3/02 , G01J3/10 , G01J3/28 , G01J3/18 , G01N21/65 , G01J1/42 , G01J3/433 , G02B6/293
摘要： In swept source Raman (SSR) spectroscopy, a swept laser beam illuminates a sample, which inelastically scatters some of the incident light. This inelastically scattered light is shifted in wavelength by an amount called the Raman shift. The Raman-shifted light can be measured with a fixed spectrally selective filter and a detector. The Raman spectrum can be obtained by sweeping the wavelength of the excitation source and, therefore, the Raman shift. The resolution of the Raman spectrum is determined by the filter bandwidth and the frequency resolution of the swept source. An SSR spectrometer can be smaller, more sensitive, and less expensive than a conventional Raman spectrometer because it uses a tunable laser and a fixed filter instead of free-space propagation for spectral separation. Its sensitivity depends on the size of the collection optics. And it can use a nonlinearly swept laser beam thanks to a wavemeter that measures the beam's absolute wavelength during Raman spectrum acquisition.
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公开(公告)号：US20210091252A1
公开(公告)日：2021-03-25
申请号：US17032223
申请日：2020-09-25
IPC分类号： H01L31/105 , H01L31/0368
摘要： Photodetectors using photonic crystals (PhCs) in polysilicon film that include an in-plane resonant defect. A biatomic photodetector includes an optical defect mode that is confined from all directions in the plane of the PhC by the photonic bandgap structure. The coupling of the resonance (or defect) mode to out-of-plane radiation can be adjusted by the design of the defect. Further, a “guided-mode resonance” (GMR) photodetector provides in-plane resonance through a second-order grating effect in the PhC. Absorption of an illumination field can be enhanced through this resonance.
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6.发明申请GUIDED-WAVE PHOTODETECTOR APPARATUS EMPLOYING MID-BANDGAP STATES OF SEMICONDUCTOR MATERIALS, AND FABRICATION METHODS FOR SAME 审中-公开使用半导体材料的中间带状态的引导波长光电装置及其制造方法公开(公告)号：US20170062636A1
公开(公告)日：2017-03-02
申请号：US15250594
申请日：2016-08-29
IPC分类号： H01L31/0392 , H01L31/112 , H01L31/18 , H01L31/0224 , H01L31/02 , H01L31/028 , H01L31/0232
CPC分类号： H01L31/02327 , H01L27/1443 , H01L31/035281 , H01L31/03682 , H01L31/103 , Y02E10/546
摘要： Guided-wave photodetectors based on absorption of infrared photons by mid-bandgap states in non-crystal semiconductors. In one example, a resonant guided-wave photodetector is fabricated based on a polysilicon layer used for the transistor gate in a SOI CMOS process without any change to the foundry process flow (‘zero-change’ CMOS). Mid-bandgap defect states in the polysilicon absorb infrared photons. Through a combination of doping mask layers, a lateral p-n junction is formed in the polysilicon, and a bias voltage applied across the junction creates a sufficiently strong electric field to enable efficient photo-generated carrier extraction and high-speed operation. An example device has a responsivity of more than 0.14 A/W from 1300 to 1600 nm, a 10 GHz bandwidth, and 80 nA dark current at 15 V reverse bias.
摘要翻译： 基于在非晶体半导体中通过中带隙状态吸收红外光子的导波光电探测器。 在一个示例中，基于用于SOI CMOS工艺中的晶体管栅极的多晶硅层制造谐振导波光电检测器，而不会改变铸造工艺流程（“零变换”CMOS）。 多晶硅中的带隙缺陷状态吸收红外光子。 通过掺杂掩模层的组合，在多晶硅中形成横向p-n结，并且跨接点施加的偏置电压产生足够强的电场，以实现有效的光生载流子提取和高速操作。 一个示例性器件的响应度从1300到1600nm的响应度大于0.14A / W，10GHz的带宽和在15V反向偏压下的80nA暗电流。
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公开(公告)号：US20170059412A1
公开(公告)日：2017-03-02
申请号：US15254855
申请日：2016-09-01
CPC分类号： G01J3/453 , G01J3/0259 , G01J3/4531 , G01J3/4532
摘要： A non-paraxial Talbot spectrometer includes a transmission grating to receive incident light. The grating period of the transmission grating is comparable to the wavelength of interest so as to allow the Talbot spectrometer to operate outside the paraxial limit. Light transmitted through the transmission grating forms periodic Talbot images. A tilted detector is employed to simultaneously sample the Talbot images at various distances along a direction perpendicular to the grating. Spectral information of the incident light can be calculated by taking Fourier transform of the measured Talbot images or by comparing the measured Talbot images with a library of intensity patterns acquired with light sources having known wavelengths.
摘要翻译： 非近轴Talbot光谱仪包括用于接收入射光的透射光栅。 传输光栅的光栅周期与感兴趣的波长相当，以便允许Talbot光谱仪在傍轴极限外运行。 通过透射光栅透射的光形成周期性的Talbot图像。 采用倾斜检测器同时沿垂直于光栅的方向以不同距离对Talbot图像进行采样。 入射光的光谱信息可以通过对所测量的Talbot图像进行傅立叶变换或通过将测量的Talbot图像与用已知波长的光源采集的强度图案的文库进行比较来计算。
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