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Low-loss silicon core fibre platform for mid-infrared nonlinear photonics

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Light(Science & Applications) 2019年第1期8卷 202-211页

作者： Haonan Ren Li Shen Antoine F.J.Runge Thomas W.Hawkins John Ballato Ursula Gibson anna c.peacock Optoelectronics Research centre University of SouthamptonSouthampton SO171BJUK Wuhan National Laboratory for Optoelectronics(WNLO) Huazhong University of Science and Technology430074 WuhanChina Department of Materials Science and Engineering Clemson UniversityClemsonSC 29634USA Department of Physics Norwegian University of Science and Technology(NTNU)N-7491 TrondheimNorway Department of Applied Physics KTH Royal Institute of Technology10044 StockholmSweden The Institute of Photonics and Optical Science(IPOS) School of PhysicsUniversity of SydneySydneyNSW 2006Australia

Broadband mid-infrared light sources are highly desired for wide-ranging applications that span free-space communications to *** recent years,silicon has attracted great interest as a platform for nonlinear optical wavelength conversion in this region,owing to its low losses(linear and nonlinear)and high ***,most research in this area has made use of small core waveguides fabricated from silicon-on-insulator platforms,which suffer from high absorption losses of the use of silica cladding,limiting their ability to generate light beyond 3μ***,we design and demonstrate a compact silicon core,silica-clad waveguide platform that has low losses across the entire silicon transparency *** waveguides are fabricated from a silicon core fibre that is tapered to engineer mode properties to ensure efficient nonlinear propagation in the core with minimal interaction of the mid-infrared light with the *** waveguides exhibit many of the benefits of fibre platforms,such as a high coupling efficiency and power handling capability,allowing for the generation of mid-infrared supercontinuum spectra with high brightness and coherence spanning almost two octaves(1.6-5.3μm).

关键词： waveguide fibre nonlinear

Raman amplification at 2.2μm in silicon core fibers with prospects for extended mid-infrared source generation

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Light(Science & Applications) 2023年第10期12卷 2097-2104页

作者： Meng Huang Shiyu Sun Than S.Saini Qiang Fu Lin Xu Dong Wu Haonan Ren Li Shen Thomas W.Hawkins John Ballato anna c.peacock Optoelectronics Research centre University of SouthamptonSouthampton SO171BJUK School of Optoelectronic Engineering and Instrumentation Science Dalian University of TechnologyDalian 116024China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China center for Optical Materials Science and Engineering Technologies and Department of Materials Science and Engineering Clemson UniversityClemsonSC 29634USA

Raman scattering provides a convenient mechanism to generate or amplify light at wavelengths where gain is not otherwise *** combined with recent advancements in high-power fiber lasers that operate at wavelengths~2μm,great opportunities exist for Raman systems that extend operation further into the mid-infrared regime for applications such as gas sensing,spectroscopy,and biomedical ***,a thulium-doped fiber laser is used to demonstrate Raman emission and amplification from a highly nonlinear silicon core fiber(ScF)platform at wavelengths beyond 2μ*** ScF has been tapered to obtain a micrometer-sized core diameter(~1.6μm)over a length of 6 cm,with losses as low as 0.2 dB cm^(−1).A maximum on-off peak gain of 30.4 dB was obtained using 10 W of peak pump power at 1.99μm,with simulations indicating that the gain could be increased to up to~50 dB by extending the ScF *** also show that by exploiting the large Raman gain and extended mid-infrared transparency of the ScF,cascaded Raman processes could yield tunable systems with practical output powers across the 2–5μm range.

关键词： fiber pump scattering

Hot-wire chemical vapor deposition low-loss hydrogenated amorphous silicon waveguides for silicon photonic devices

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Photonics Research 2019年第2期7卷 193-200页

作者： SWE Z.OO ANTULIO TARAZONA ALI Z.KHOKHAR RAFIDAH PETRA YOHANN FRANZ GORAN Z.MASHANOVIcH GRAHAM T.REED anna c.peacock HAROLD M.H.cHONG School of Electronics and computer Science University of Southampton Optoelectronics Research centre University of Southampton School of Electrical and Electronic Engineering Nanyang Technological University

We demonstrate low-loss hydrogenated amorphous silicon(a-Si:H) waveguides by hot-wire chemical vapor deposition(HWcVD). The effect of hydrogenation in a-Si at different deposition temperatures has been investigated and analyzed by Raman spectroscopy. We obtained an optical quality a-Si:H waveguide deposited at 230°c that has a strong Raman peak shift at 480 cm^(-1), peak width(full width at half-maximum) of 68.9 cm^(-1), and bond angle deviation of 8.98°. Optical transmission measurement shows a low propagation loss of 0.8 dB/cm at the1550 nm wavelength, which is the first, to our knowledge, report for a HWcVD a-Si:H waveguide.

关键词： Hot-wire low-loss amorphous

Post-fabrication phase trimming of Mach–Zehnder interferometers by laser annealing of germanium implanted waveguides

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Photonics Research 2017年第6期5卷 97-101页

作者： XIA cHEN MILAN M.MILOSEVIc DAVID J.THOMSON ALI Z.KHOKHAR YOHANN FRANZ ANTOINE F.J.RUNGE SAKELLARIS MAILIS anna c.peacock GRAHAM T.REED Optoelectronics Research centre University of Southampton

We demonstrate a novel high-accuracy post-fabrication trimming technique to fine-tune the phase of integrated Mach–Zehnder interferometers, enabling permanent correction of typical fabrication-based phase errors. The effective index change of the optical mode is 0.19 in our measurement, which is approximately an order of magnitude improvement compared to previous work with similar excess optical loss. Our measurement results suggest that a phase accuracy of 0.078 rad was achievable with active feedback control.

关键词： Post-fabrication phase trimming of Mach Zehnder interferometers by laser annealing of germanium implanted waveguides MZI

Beyond microbial carbon use efficiency

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National Science Review 2024年第4期11卷 33-35页

作者： Ke-Qing Xiao chao Liang Zimeng Wang Jingjing Peng Yao Zhao Ming Zhang Mingyu Zhao Shuiqing chen Yong-Guan Zhu caroline L.peacock State Key Lab of Urban and Regional Ecology Research Center for Eco-Environmental SciencesChinese Academy of Sciences University of chinese Academy of Sciences Institute of Applied Ecology Chinese Academy of Sciences Department of Environmental Science and Engineering Fudan University college of Resources and Environmental Sciences China Agricultural University State Key Laboratory of Environmental criteria and Risk Assessment Chinese Research Academy of Environmental Sciences State Key Laboratory of Agricultural Microbiology College of Resources and Environment Huazhong Agricultural University Key Laboratory of cenozoic Geology and Environment Institute of Geology and Geophysics Chinese Academy of Sciences School of Earth and Environment University of Leeds

Microbial carbon use efficiency (cUE)is defined as the proportion of microbial biomass growth c versus substrate c uptake, and thus provides a useful measure of microbially driven accumulation and loss of soil organic carbon (SOc)[1]. In a recent study published in Nature [2],the authors used a data-driven machinelearning approach to conclude that cUE promotes global SOc storage based on a positive correlation between cUE and SOc content and that, based on sensitivity analysis, cUE is at least four times as important as six other evaluated factors,namely plant c inputs, c input allocation, non-microbial c transfer, substrate decomposability, environmental modifications and vertical transport.

关键词： SOIL-cARBON ORGANIc-MATTER

classical imaging with undetected photons using four-wave mixing in silicon core fibers

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Photonics Research 2023年第2期11卷 137-142页

作者： M.HUANG D.WU H.REN L.SHEN T.W.HAWKINS J.BALLATO U.J.GIBSON M.BERESNA R.SLAVíK J.E.SIPE M.LIScIDINI A.c.peacock Optoelectronics Research centre University of SouthamptonSouthamptonSO171BJUK School of Optoelectronic Engineering and Instrumentation Science Dalian University of TechnologyDalian 116024China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China centre for Optical Materials Science and Engineering Technologies and Department of Materials Science and Engineering Clemson UniversityClemsonSouth Carolina 29634USA Department of Physics University of TorontoTorontoOntario M5S 1A7Canada Department of Physics University of PaviaI-27100 PaviaItaly

Undetected-photon imaging allows for objects to be imaged in wavelength regions where traditional components are unavailable. Although first demonstrated using quantum sources, recent work has shown that the technique also holds with classical beams. To date, however, all the research in this area has exploited parametric downconversion processes using bulk nonlinear crystals within free-space systems. Here, we demonstrate undetectedphoton-based imaging using light generated via stimulated four-wave mixing within highly nonlinear silicon fiber waveguides. The silicon fibers have been tapered to have a core diameter of915 nm to engineer the dispersion and reduce the insertion losses, allowing for tight mode confinement over extended lengths to achieve practical nonlinear conversion efficiencies(-30 dB) with modest pump powers(48 m W). Both amplitude and phase images are obtained using classically generated light, confirming the high degree of spatial and phase correlation of our system. The high powers(>10 nW) and long coherence lengths(>4 km) associated with our large fiber-based system result in high contrast and stable images.

关键词： mixing fibers nonlinear

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BIG-BANG cOSMOLOGY

chinese Physics c 2016年第10期40卷 355-366页

作者： K.A. Olive J.A. peacock University of Minnesota University of Edinburgh

22.1. Introduction to Standard Big-Bang Model The observed expansion of the Universe [1-3] is a natural （almost inevitable） result of any homogeneous and isotropic cosmological model based on general relativity. However, by itself, the Hubble expansion does not provide sufficient evidence for what we generally refer to as the Big-Bang model of cosmology. While general relativity is in principle capable of describing the cosmology of any given distribution of matter, it is extremely fortunate that our Universe appears to be homogeneous and isotropic on large scales. Together, homogeneity and isotropy allow us to extend the copernican Principle to the cosmological Principle, stating that all spatial positions in the Universe are essentially equivalent.

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正断层系统中传递斜坡的几何形态及演化

国外油气勘探 1995年第1期7卷 13-24页

作者： D. c. P. peacock 杨德垠石油地球物理勘探局物探地质研究院

在平面图上,传递斜坡出现在叠覆的正断层段之间。本文描述了英格兰Somerset海岸出露的传递斜坡的几何形态及演化,并与其它地方大规模的传递斜坡进行了比较。根据叠覆段之间相互作用和连接程度,可将传递斜坡分成四类,这些类型解释为正在... 详细信息

在平面图上,传递斜坡出现在叠覆的正断层段之间。本文描述了英格兰Somerset海岸出露的传递斜坡的几何形态及演化,并与其它地方大规模的传递斜坡进行了比较。根据叠覆段之间相互作用和连接程度,可将传递斜坡分成四类,这些类型解释为正在演化的阶段。第1阶段叠覆段不发生相互作用,第2阶段两条相互作用的断层之间地层重新定向,产生传递斜坡。第3阶段连接的裂缝开始切割传递斜坡。第4阶段传递斜坡被破坏,产生了一条含有沿走向弯曲段的断层。这些演化阶段随时间发展,此外,它们也能在空间上观察到。两正断层之间的分支线或一个走向弯曲段可反映第4阶段的传递作用。沿断层的上倾或下倾方向,可逐步出现前期的演化阶段。断层段和连接断层在位移—距离图上特征的变化与断层间的相互作用和连接过程同时发生。传递斜坡产生的转换位移沿着叠覆处的断层段具有陡倾的位移梯度。传递斜坡常造成连接处总的断层位移最小值。

关键词：正断层斜坡几何形态盆地油气运移石油生成

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走滑断层带的位移和各段的连接

地震地质译丛

地震地质译丛 1993年第1期 11-18页

作者： D.c.P.peacock 徐杰计凤桔

本文描述走滑断裂带各段的位移变化,并用岩性变化、共轭关系、水平断错、各段的连接和弯曲对断层发育的影响来解释这种变化。文中研究了苏格兰柯库布里附近雷贝里(坐标参考 NX699437)和吉普赛角(坐标参考 NX685435)一带志留纪砂页岩中... 详细信息

本文描述走滑断裂带各段的位移变化,并用岩性变化、共轭关系、水平断错、各段的连接和弯曲对断层发育的影响来解释这种变化。文中研究了苏格兰柯库布里附近雷贝里(坐标参考 NX699437)和吉普赛角(坐标参考 NX685435)一带志留纪砂页岩中五条规模较小的走滑断裂带(图1)。雷贝里和吉普赛角地区的走滑断层图,显示出平均位移方向的剖面和垂直层理的剖面。

关键词：厚层地层平移断层地质断层走滑断层断层长度水平断错断层带构造带断裂带