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High-Efficiency Photo-Induced Charge Transfer for SERS Sensing in N-Doped 3D-Graphene on Si Heterojunction

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Energy & Environmental Materials 2024年第2期7卷 268-276页

作者： Guanglin Zhang Jie Sun Genwang Wei Shan Zhang Zhengyi He Huijuan Wu Bingkun Wang Siwei Yang Guqiao Ding Zhiduo Liu Zhiwen Jin Caichao Ye Gang Wang department of Microelectronic Science and engineering School of Physical Science and TechnologyNingbo UniversityNingbo 315211China department of Biochemistry and Molecular Biology School of Basic Medical SciencesShenzhen UniversityShenzhen 518071China Academy for Advanced Interdisciplinary Studies&department of Materials Science and engineering Guangdong Provincial Key Laboratory of Computational Science and Material DesignSouthern University of Science and TechnologyShenzhen 518055China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)School of PhysicsBeijing Institute of TechnologyBeijing 100081China School of Physical Science and Technology&Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education Lanzhou UniversityLanzhou 730000China

Nitrogen-doped three-dimensional graphene(N-doped 3D-graphene)is a graphene derivative with excellent adsorption capacity,large specific surface area,high porosity,and optoelectronic ***,N-doped 3D-graphene/Si heterojunctions were grown in situ directly on silicon(Si)substrates via plasma-assisted chemical vapor deposition(PACVD),which is promising for surface-enhanced Raman scattering(SERS)substrates *** analyses of theoretical simulation,incorporating N atoms in 3D-graphene are beneficial to increase the electronic state density of the system and enhance the charge transfer between the substrate and the target *** enhancement of the optical and electric fields benefits from the stronger light-matter interaction improved by the natural nano-resonator structure of N-doped *** as-prepared SERS substrates based on N-doped 3D-graphene/Si heterojunctions achieve ultra-low detection for various molecules:10^(-8)M for methylene blue(MB)and 10^(-9)M for crystal violet(CRV)with rhodamine(R6G)of 10^(10)*** practical detected,10^(-8)M thiram was precisely detected in apple peel *** results indicate that N-doped 3D-graphene/Si heterojunctions based-SERS substrates have promising applications in low-concentration molecular detection and food safety.

关键词： charge transfer DFT simulation N-doped 3D-graphene SERS Thiram detection

An AI-empowered indoor digital contact tracing system for COVID-19 outbreaks in residential care homes

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Infectious Disease Modelling 2024年第2期9卷 474-482页

作者： Jiahui Meng Justina Yat Wa Liu Lin Yang Man Sing Wong Hilda Tsang Boyu Yu Jincheng Yu Freddy Man-Hin Lam Daihai He Lei Yang Yan Li Gilman Kit-Hang Siu Stefanos Tyrovolas Yao Jie Xie David Man David H.K.Shum School of Nursing The Hong Kong Polytechnic UniversityHong Kong Special Administrative RegionChina electronic and information engineering The Hong Kong Polytechnic UniversityHong Kong Special Administrative RegionChina research centre of Textiles for Future Fashion The Hong Kong Polytechnic UniversityHong Kong Special Administrative RegionChina department of Land Surveying and Geo-Informatics The Hong Kong Polytechnic UniversityHong Kong Special Administrative RegionChina department of Applied Mathematics The Hong Kong Polytechnic UniversityHong Kong Special Administrative RegionChina The Jockey Club School of Public Health and Primary Care The Chinese University of Hong KongHong Kong Special Administrative RegionChina department of Rehabilitation Sciences The Hong Kong Polytechnic UniversityHong Kong Special Administrative RegionChina department of Computing The Hong Kong Polytechnic UniversityHong Kong Special Administrative RegionChina department of Health Technology and Informatics The Hong Kong Polytechnic UniversityHong Kong Special Administrative RegionChina department of Nutrition and Food Studies George Mason UniversityUSA Tung Wah College Hong Kong Special Administrative RegionChina Mental Health research centre The Hong Kong Polytechnic UniversityHong Kong Special Administrative RegionChina

An AI-empowered indoor digital contact-tracing system was developed using a centralized architecture and advanced low-energy Bluetooth technologies for indoor positioning,with careful preservation of privacy and data *** analyzed the contact pattern data from two RCHs and investigated a COVID-19 outbreak in one study *** evaluate the effectiveness of the system in containing outbreaks with minimal contacts under quarantine,a simulation study was conducted to compare the impact of different quarantine strategies on outbreak containment within *** significant difference in contact hours between weekdays and weekends was observed for some pairs of RCH residents and staff during the two-week data collection *** significant difference between secondary cases and uninfected contacts was observed in a COVID-19 outbreak in terms of their demographics and contact *** results based on the collected contact data indicated that a threshold of accumulative contact hours one or two days prior to diagnosis of the index case could dramatically increase the efficiency of outbreak containment within RCHs by targeted isolation of the close *** study demonstrated the feasibility and efficiency of employing an AI-empowered system in indoor digital contact tracing of outbreaks in RCHs in the post-pandemic era.

关键词： COVID-19 Indoor contact tracing Contact pattern Outbreak containment Artificial intelligence

Amplification and Compression of Ultrashort Fundamental Solitons in An Erbium-Doped Nonlinear Amplifying Fiber Loop Mirror

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光学学报 2003年第S1期23卷 393-394页

作者： P. K. A. Wai photonics research centre and department of electronic and information engineering The Hong Kong Polytechnic University Hung HomHong Kong

A nonlinear amplifying loop mirror constructed from erbium-doped fiber is proposed for simultaneous amplification and compression of ultrashort fundamental solitons. Numerical simulations show that, the proposed devic... 详细信息

关键词： of length that for Amplification and Compression of Ultrashort Fundamental Solitons in An Erbium-Doped Nonlinear Amplifying Fiber Loop Mirror in

The Soft X-ray Imager(SXI)on the SMILE Mission

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Earth and Planetary Physics 2024年第1期8卷 5-14页

作者： S.Sembay A.L.Alme D.Agnolon T.Arnold A.Beardmore A.Belén Balado Margeli C.Bicknell C.Bouldin G.Branduardi-Raymont T.Crawford J.P.Breuer T.Buggey G.Butcher R.Canchal J.A.Carter A.Cheney Y.Collado-Vega H.Connor T.Crawford N.Eaton C.Feldman C.Forsyth T.Frantzen G.Galgóczi J.Garcia G.Y.Genov C.Gordillo H-P.Gröbelbauer M.Guedel Y.Guo M.Hailey D.Hall R.Hampson J.Hasiba O.Hetherington A.Holland S-Y.Hsieh M.W.J.Hubbard H.Jeszenszky M.Jones T.Kennedy K.Koch-Mehrin S.Kögl S.Krucker K.D.Kuntz C.Lakin G.Laky O.Lylund A.Martindale J.Miguel Mas Hesse R.Nakamura K.Oksavik N.Østgaard H.Ottacher R.Ottensamer C.Pagani S.Parsons P.Patel J.Pearson G.Peikert F.S.Porter T.Pouliantis B.H.Qureshi W.Raab G.Randal A.M.Read N.M.M.Roque M.E.Rostad C.Runciman S.Sachdev A.Samsonov M.Soman D.Sibeck S.Smit J.Søndergaard R.Speight S.Stavland M.Steller TianRan Sun J.Thornhill W.Thomas K.Ullaland B.Walsh D.Walton C.Wang S.Yang School of Physics and Astronomy University of LeicesterLeicesterLE17RHUK Space Park Leicester University of LeicesterLeicesterLE17RHUK Mullard Space Science Laboratory University College LondonDorkingRH56NTUK centre for electronic Imaging Open UniversityMilton KeynesMK76 AAUK Birkeland centre for Space Science Department of Physics and TechnologyUniv.of BergenN-5007 BergenNorway University of Vienna A-1010 ViennaAustria Space research Institute Austrian Academy of SciencesA-8042 GrazAustria National Institute of Aerospace Technology MadridSpain ESTEC European Space Agency2201 AZ NoordwijkNetherlands State Key Laboratory of Space Weather National Space Science CentreBeijing 100190China University of Applied Sciences and Arts Northwestern Switzerland CH-5210 WindischSwitzerland Koegl Space GmbH CH-8157 DielsdorfSwitzerland Space Acoustics GmbH CH-8157 DielsdorfSwitzerland Zurich University of Applied Sciences 8400 WinterhurSwitzerland Genov Solutions N-5172 LoddefjordNorway STM engineering N-5165 LaksevagNorway John Hopkins University Applied Physics Laboratory MD 20723USA NASA/Goddard Space Flight centre MD 20771USA Center for Space Physics Boston UniversityBostonMA 02215USA department of Theoretical Physics and Astrophysics Masaryk University60177 BrnoCzech Republic Institute of Physics E¨otvo¨s Lor´and University1053 BudapestHungary Aerospace information research Institute Chinese Academy of SciencesBeijing 100045China Centro de Astrobiologia(CAB) CSIC-INTAMadridSpain

The Soft X-ray Imager(SXI)is part of the scientific payload of the Solar wind Magnetosphere Ionosphere Link Explorer(SMILE)*** is a joint science mission between the European Space Agency(ESA)and the Chinese Academy of Sciences(CAS)and is due for launch in *** is a compact X-ray telescope with a wide field-of-view(FOV)capable of encompassing large portions of Earth’s magnetosphere from the vantage point of the SMILE *** is sensitive to the soft X-rays produced by the Solar Wind Charge eXchange(SWCX)process produced when heavy ions of solar wind origin interact with neutral particles in Earth’s *** provides a mechanism for boundary detection within the magnetosphere,such as the position of Earth’s magnetopause,because the solar wind heavy ions have a very low density in regions of closed magnetic field *** sensitivity of the SXI is such that it can potentially track movements of the magnetopause on timescales of a few minutes and the orbit of SMILE will enable such movements to be tracked for segments lasting many *** is led by the University of Leicester in the United Kingdom(UK)with collaborating organisations on hardware,software and science support within the UK,Europe,China and the United States.

关键词： Soft X-ray Imaging micropore optics large area CCD

Stopping and storing light pulses within a fiber optic ring resonator

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Chinese Optics Letters 2009年第9期7卷 778-780页

作者： F.H.Suhailin J.Ali P.P.Yupapin Y.Fujii H.Ahmad S.W.Harun Institute of Advanced photonics Sciences Science FacultyUniversiti Teknologi Malaysia Advanced research Center for photonics Faculty of ScienceKing Mongkut's Institute of Technology Ladkrabang department of electronic engineering Gunma University photonics research centre University of Malaya

A simple all optical system for stopping and storing light pulses is demonstrated. The system consists of an erbium-doped fiber amplifier （EDFA）, a semiconductor optical amplifier （SOA）, and a fiber ring resonator. The results show that the multisoliton generation with a free spectrum range of 2.4 nm and a pulse spectral width of 0.96 nm is achieved. The memory time of 15 min and the maximum soliton output power of 5.94 dBm are noted, respectively. This means that light pulses can be trapped, i.e., stopped optically within the fiber ring resonator.

关键词： ring In Stopping and storing light pulses within a fiber optic ring resonator EDFA

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机械工程助力半导体纤维光子学

Science Bulletin 2024年第14期69卷 2151-2152页

作者： Anna C.Peacock Optoelectronics research centre University of SouthamptonSO171BJUK

Glass optical fibres have had a tremendous impact on modern society,not only changing the way we communicate and share information on a global scale,but also how we sense,monitor,and manufacture using light-based *** fashioned from silica glass,commercial optical fibres owe their ubiquity to decades of efforts in optimizing the fabrication techniques to minimize transmission losses,principally within the telecommunications wavelength bands[1].However,the intrinsic properties of silica glass,such as its transmission window,nonlinear coefficients,and the absence of electronic functionality,have limited the use of these fibres in some ***,alongside these efforts,fibre fabrication teams have continued to explore alternative material systems that can help to lift some of these limitations and extend the reach of optical fibres and their applications.

关键词：光子学 silica fibres

Upstream Channel Utilization of CSMA/CD-Based Ethernet over Passive Optical Networks

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光学学报 2003年第S1期23卷 737-738页

作者： Elaine Wong Chang-Joon Chae Australian photonics Cooperation research centre Photonics Research Laboratory Department of Electrical and Electronic Engineering The University of Melbourne VIC 3010 Australia.Australian Photonics Cooperation Research Centre Photonics Research Laboratory Department of Electrical and Electronic Engineering The University of Melbourne VIC 3010 Australia.

We demonstrate that an asynchronous CSMA/CD protocol with an optical loop-back star coupler can achieve high upstream channel utilizatbn in an Ethernet PON, readily supporting a large installed base of Ethernet 10Base... 详细信息

关键词： CSMA on as of Upstream Channel Utilization of CSMA/CD-Based Ethernet over Passive Optical Networks ONU OLT over CD

A small microring array that performs large complex-valued matrix-vector multiplication

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Frontiers of Optoelectronics 2022年第2期15卷 1-15页

作者： Junwei Cheng Yuhe Zhao Wenkai Zhang Hailong Zhou Dongmei Huang Qing Zhu Yuhao Guo Bo Xu Jianji Dong Xinliang Zhang Wuhan National Laboratory for Optoelectronics School of Optical and Electronic InformationHuazhong University of Science and TechnologyWuhan 430074China photonics research centre Department of Electronic and Information EngineeringThe Hong Kong Polytechnic UniversityHong Kong 999077China The Hong Kong Polytechnic University Shenzhen research Institute Shenzhen 518057China photonics research centre Department of Electrical EngineeringThe Hong Kong Polytechnic UniversityHong Kong 999077China Institute of Strategic research Huawei TechnologiesShenzhen 518129China

As an important computing operation,photonic matrix-vector multiplication is widely used in photonic neutral networks and signal ***,conventional incoherent matrix-vector multiplication focuses on real-valued operations,which cannot work well in complex-valued neural networks and discrete Fourier *** this paper,we propose a systematic solution to extend the matrix computation of microring arrays from the real-valued field to the complex-valued field,and from small-scale(i.e.,4×4)to large-scale matrix computation(i.e.,16×16).Combining matrix decomposition and matrix partition,our photonic complex matrix-vector multiplier chip can support arbitrary large-scale and complex-valued matrix *** further demonstrate Walsh-Hardmard transform,discrete cosine transform,discrete Fourier transform,and image convolutional *** scheme provides a path towards breaking the limits of complex-valued computing accelerator in conventional incoherent optical *** importantly,our results reveal that an integrated photonic platform is of huge potential for large-scale,complex-valued,artificial intelligence computing and signal processing.

关键词： Photonic matrix-vector multiplication Complex-valued computing Microring array Signal/image processing

Frequency comb swept laser with a high-Q microring filter

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photonics research 2020年第6期8卷 904-911页

作者： DONGMEI HUANG FENG LI CHAO SHANG ZIHAO CHENG S.T.CHU P.K.A.WAI photonics research centre Department of Electronic and Information EngineeingThe Hong Kong Polytechnic UniversityHong Kong SARChina The Hong Kong Polytechnic University Shenzhen research Institute Shenzhen 518057China photonics research centre Department of Electrical EngineeringThe Hong Kong Polytechnic UniversityHong Kong SARChina department of Physics and Materials Science City University of Hong KongHong Kong SARChina

Frequency comb swept lasers are the enabling technology of circular interferometric *** was proposed to break the bottleneck of data acquisition and proessing in optical coherence tomography(OCT)at video *** this paper,we propose and demonstrate a highly coherent frequency comb swept laser by using a high-quality(high-Q)microring comb filter to discretize a Fourier domain mode-locked(FDML)*** microring filter has a Q factor of^2×10^6 and a linewidth of^90 *** demonstrate the improvement in performance,a Fabry-Perot comb filter with a Q factor of 6.2×10^4 and a linewidth of 3.1 GHz is also used in the experiment for *** comb filters have free spectral ranges(FSRs)of^50 GHz for *** and clearly discretized temporal waveforms and frequency comb spectra with 50 GHz FSR are *** of the high-Q microring filter narrows the instantaneous linewidth of the FDML laser down to 1.5 *** OCT system with the frequency comb swept laser source with a microring filter demonstrates an ultralong imaging range,which has a 6,10,and 15 dB sensitivity roll-off length of^53,~73,and over 100 mm,respectively.

关键词： microring filter laser