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CLEO: Science and Innovations in CLEO 2024, CLEO: S and I 2024 - Part of Conference on Lasers and Electro-Optics

作者： Zheng, Yi Kong, Deming Jia, Shi Zhou, Liping Wang, Chengli Yi, Ailun Galili, Michael Morioka, Toshio Yvind, Kresten Ou, Xin Oxenløwe, Leif Katsuo Pu, Minhao DTU Electro Department of Electrical and Photonics Engineering Technical University of Denmark Kgs. LyngbyDK-2800 Denmark State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai200050 China

We demonstrate the first dark-pulse Kerr comb in the SiCOI platform and its application for terahertz wireless communication with 100.78 Gbit/s net rate per spatial channel over a 10-meter free space distance. © ... 详细信息

关键词： Optical Kerr effect

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High-resolution ARPES endstation for in situ electronic structure investigations at SSRF

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Nuclear Science and Techniques 2021年第3期32卷 94-106页

作者： Yi-Chen Yang Zheng-Tai Liu Ji-Shan Liu Zhong-Hao Liu Wan-Ling Liu Xiang-Le Lu Hong-Ping Mei Ang Li Mao Ye Shan Qiao Da-Wei Shen State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China University of Chinese Academy of Sciences Beijing 100049China

Angle-resolved photoemission spectroscopy(ARPES)is one of the most powerful experimental techniques in condensed matter *** ARPES,which uses photons with high flux and continuously tunable energy,has become particularly ***,an excellent synchrotron ARPES system must have features such as a small beam spot,super-high energy resolution,and a user-friendly operation interface.A synchrotron beamline and an endstation(BL03 U)were designed and constructed at the Shanghai Synchrotron Radiation *** beam spot size at the sample position is 7.5(V)μm×67(H)μm,and the fundamental photon range is 7-165 eV;the ARPES system enables photoemission with an energy resolution of 2.67 meV at21.2 *** addition,the ARPES system of this endstation is equipped with a six-axis cryogenic sample manipulator(the lowest temperature is 7 K)and is integrated with an oxide molecular beam epitaxy system and a scanning tunneling microscope,which can provide an advanced platform for in situ characterization of the fine electronic structure of condensed matter.

关键词： Synchrotron ARPES In situ VUV laser Quantum materials

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Waveguide-coupled deterministic quantum light sources and post-growth engineering methods for integrated quantum photonics

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Chip 2022年第3期1卷 28-49页

作者： Xu-Dong Wang Yi-Fan Zhu Ting-Ting Jin Wei-Wen Ou Xin Ou Jia-Xiang Zhang State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200092China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Integrated photonic quantum circuits(IPQCs)have attracted increasing attention in recent years due to their widespread applications in quantum information *** the most envisioned quantum technologies such as quantum communications,quantum computer and quantum simulations have placed a strict constraint on the scalability of chip-integrated quantum light *** introducing sizeconfined nanostructures or crystal imperfections,low-dimensional semiconductors have been broadly explored as chip-scale deterministic single-photon sources(SPSs).Thus far a variety of chip-integrated deterministic SPSs have been investigated across both monolithic and hybrid photonic platforms,including molecules,quantum dots,color centers and two-dimensional *** the rapid development of the chip-scale generation of single photons with deterministic quantum emitters,the field of IPQCs has raised new challenges and *** this paper,we highlight recent progress in the development of waveguide-coupled deterministic SPSs towards scalable IPQCs,and review the post-growth tuning techniques that are specifically developed to engineer the optical properties of these WG-coupled *** prospects on stringent requirement for the quantum engineering toolbox in the burgeoning field of integrated photonics are also discussed.

关键词： Single photon sources On-chip Integrated circuits Post-growth engineering Low-dimensional semiconductors

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Grain boundary boosting the thermal stability of Pt/CeO_(2)thin films

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Nano Research 2023年第2期16卷 3278-3286页

作者： Luyao Wang Xiaobao Li Xiangchen Hu Shuyue Chen Zhehao Qiu Yifan Wang Hui Zhang Yi Yu Bo Yang Yong Yang Pasquale Orgiani Carmela Aruta Nan Yang Electrochemical thin film group School of physical science and technologyShanghaiTech UniversityShanghai 201210China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China School of physical science and technology ShanghaiTech UniversityShanghai 201210China CNR-IOM TASC National LaboratoryI-34149 TriesteItaly CNR-SPIN UOS RomaArea della Ricerca di Tor VergataRome I-00133Italy

Understanding how defect chemistry of oxide material influences the thermal stability of noble metal dopant ions plays an important role in designing high-performance heterogeneous catalytic *** we use in-situ ambient-pressure X-ray photoemission spectroscopy(APXPS)to experimentally determine the role of grain boundary in the thermal stability of platinum doped cerium oxide(Pt/CeO_(2)).The grain boundaries were introduced in Pt/CeO_(2)thin films by pulsed laser deposition without significantly change of the surface *** defect level was tuned by the strain field obtained using a highly/low mismatched *** Pt/CeO_(2)thin film models having well defined crystallographic properties but different grain boundary structural defect levels provide an ideal platform for exploring the evolution of Pt–O–Ce bond with changing the temperature in reducing *** have direct demonstration and explanation of the role of Ce^(3+)induced by grain boundaries in enhancing Pt2+*** observe that the Pt^(2+)–O–Ce^(3+)bond provides an ideal coordinated site for anchoring of Pt^(2+)ions and limits the further formation of oxygen vacancies during the reduction with H_(2).Our findings demonstrate the importance of grain boundary in the atomic-scale design of thermally stable catalytic active sites.

关键词： platinum doped cerium oxide(Pt/CeO_(2)) pulsed laser deposition epitaxial thin films grain boundaries defect engineering in-situ ambient-pressure X-ray photoemission spectroscopy

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Study on X-ray and electron-excited fluorescence spectroscopy of tungsten using TES

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Nuclear Science and Techniques 2025年第4期36卷 119-126页

作者： Bing-Jun Wu Jing-Kai Xia Shuo Zhang Robin Cantor Wen-Tao Wu Jin-Hua Li Xiao-Ming Xie Zhi Liu State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Center for Transformative Science ShanghaiTech UniversityShanghai 201210China University of Chinese Academy of Sciences Beijing 100049China STAR Cryoelectronics 25-A Bisbee CourtSanta FeNM 87508-1338USA Center for Excellence in Superconducting Electronics Chinese Academy of SciencesShanghai 200050China Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China

In the exploration of celestial bodies,such as Mars,the Moon,and asteroids,X-ray fluorescence analysis has emerged as a critical tool for elemental ***,the varying selection rules and excitation sources introduce ***,these discrepancies can cause variations in the intensities of the characteristic spectral lines emitted by identical *** variations,compounded by the minimal energy spacing between these spectral lines,pose substantial challenges for conventional silicon drift detectors(SDD),hindering their ability to accurately differentiate these lines and provide detailed insights into the material *** overcome this challenge,a cryogenic X-ray spectrometer based on transition-edge sensor(TES)detector arrays is required to achieve precise *** study measured and analyzed the K-edge characteristic lines of copper and the diverse L-edge characteristic lines of tungsten using a comparative analysis of the electron and X-ray excitation *** the electron excitation experiments,copper and tungsten targets were employed as X-ray sources,as they emit distinctive X-ray spectra upon electron-beam *** the photon excitation experiments,a molybdenum target was used to produce a continuous spectrum with the prominent Mo Kαlines to emit pure copper and tungsten *** detectors were used for the comparative spectroscopic *** initial comparison revealed no substantial differences in the Kαand Kβlines of copper across different excitation ***,the Lαlines of tungsten exhibited uniformity under different excitation ***,this investigation revealed pronounced differences within the Lβline *** study found that XRF spectra preferentially excite outer-shell electrons,in contrast to intrinsic spectra,owing to different photon and electron interaction *** interactions are selection-ruledependent and involve a single electron,whereas electron intera

关键词： X-ray spectra X-ray emission spectra and fluorescence Superconducting transition-edge sensor X-ray γ-ray spectrometers

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Compositional study of δ-NbN film by Auger electron microscopy

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Tungsten 2023年第1期5卷 130-135页

作者： Zhao-Xi Chen Peng Dong Yi-Wen Zhang Yi-Lan Jiang Yi-Fan Ding Yue-Shen Wu Jing-Hui Wang Xiang Zhou Jun Li Center for Transformative Science ShanghaiTech UniversityShanghai 201210China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China ShanghaiTech Laboratory for Topological Physics ShanghaiTech UniversityShanghai 200031China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Wuhan National High Magnetic Field Center Huazhong University of Science&TechnologyWuhan 430074China

The chemical stoichiometry on the surface of superconducting δ-NbN thin films is of great importance for their ***,we fabricated the δ-NbN thin films on SiO2/Si substrate by DC sputtering *** film was characterized using X-ray diffraction(XRD) and atomic force microscopy(AFM).Transport properties were measured to reveal the field dependent superconducting transition *** XRD and electrical measurement show high crystallinity of δ-NbN phase.A homogeneous and smooth surface morphology was measured by *** electron spectroscopy(AES) was applied to analyze the composition along the depth of the *** evolution of Auger peak profile,heights and nitride stoichiometry at the film surface is *** current study provides a more thorough understanding of complex chemical compositions of δ-NbN thin films.

关键词： Superconducting films Magnetron sputtering Auger electron spectroscopy Depth profile Surface oxidation

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Modulating surface oxygen species via facet engineering for efficient conversion of nitrate to ammonia

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Journal of Energy Chemistry 2023年第3期78卷 211-221,I0007页

作者： Wenye Zhong Zhiheng Gong Zuyun He Nian Zhang Xiongwu Kang Xianwen Mao Yan Chen School of Environment and Energy State Key Laboratory of Pulp and Paper EngineeringSouth China University of TechnologyGuangzhou 510006GuangdongChina State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Department of Materials Science and Engineering National University of SingaporeSingapore 119077Singapore Institute of Functional Intelligent Materials National University of SingaporeSingapore 119077Singapore Centre for Advanced 2D Materials National University of SingaporeSingapore 119077Singapore

Electrochemical reduction of nitrate,a common pollutant in aquatic environment,to valuable ammonia(NO3-RR) using renewably-sourced electricity has attracted widespread interests,with past efforts mainly focused on designing electrocatalysts with high activity and *** detailed correlation between catalyst properties and NO3-RR kinetics,nevertheless,is still not fully *** this work,we modulate the surface oxygen species of Cu_(2)O via facet engineering,and systematically study the impact of these oxygen species on the NO_(3)^(-)RR *** advanced spectroscopic techniques,densi ty fu n ctional theory calculations and molecular dynamics simulations,we find that while oxygen vacancies on Cu_(2)O(111) surface promote the adsorption of reactants and reaction intermediates,hydroxyl groups effectively inhibit the side reaction of hydrogen evolution and facilitate the hydrogenation process of *** two effects work in concert to render Cu_(2)O(111) facet the highest NO3-RR activity relative to those from other *** study provides critical insights into the synergistic effect of exposed facets and surface oxygen species on heterogeneous catalysis,and offers a generalizable,facet engineeringbased strategy for improving the performance of a variety of electrocatalysts important for renewable energy conversion.

关键词： Facet engineering Oxygen vacancy Hydroxyl group Electrochemical nitrate reduction Ammonia

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Ultra-broadband and low loss Silicon Photonic Power Splitter with Enhanced Coupling of Subwavelength Waveguides 3

Ultra-broadband and low loss Silicon Photonic Power Splitter...

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3rd International Conference on Laser, Optics, and Optoelectronic technology, LOPET 2023

作者： Wu, Longsheng Li, Hanyue Wu, Aimin State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai200050 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China

ISBN: (纸本)9781510667624

An on-chip optical power splitter is a crucial component for optical signal processing, widely used to implement Mach-Zehnder Interferometer, 1×2 switches, and optical arrays for various photonic integrated circuit (PIC) applications. In this paper, we present a tapered silicon waveguide power splitter with assisted subwavelength gratings (SWGs) that enhances coupling between waveguides and relaxes the critical dimensions requirement of the devices, with a taper tip width of 100 nm. The three-dimensional Finite-Difference-Time-Domain (3D-FDTD) simulation results demonstrate that the splitter has a low loss of only 0.1 dB over an ultra-broad wavelength range from 1200 nm to 1700 nm. The dependence of the performance on geometry variations, including tip width, gap spacing, waveguide width, and thickness of the device layer, is also investigated to illustrate the fabrication tolerance. The power splitter is also proved to be temperature-insensitive. With the advantages of low loss, ultra-broadband, fabrication-tolerant, temperature-insensitive, and relaxed critical dimensions (≥100 nm), the proposed power splitter is a promising practical building block for large-scale PICs. © 2023 SPIE.

关键词： Silicon photonics

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Efficient coupling interface for hybrid integration of DFB lasers on 3μm SOI waveguide platform 3

Efficient coupling interface for hybrid integration of DFB l...

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3rd International Conference on Laser, Optics, and Optoelectronic technology, LOPET 2023

作者： Lv, Dongsheng Liu, Chenyang Ding, Yanyue Wu, Aimin State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai200050 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China

ISBN: (纸本)9781510667624

An optical coupling interface is a crucial component in Silicon Photonics (SiPh) technology for optical signal transmission. It is widely utilized to achieve on-chip light sources and optical input/output for SiPh chips. In this work, we report a coupling interface with a focusing structure based on the 3μm SOI waveguide platform to minimize mode profile mismatch, resulting in a high coupling efficiency and relatively large -1dB alignment tolerances across a wide bandwidth. Simulation results show that our design achieved a high transmission of greater than -0.85dB across the 1500-1600nm range, with a maximum of -0.847dB. When the laser is positioned 1.5μm away from the waveguide facet, the -1dB tolerances are ±0.62μm and ±0.45μm in the horizontal and vertical directions, respectively. Additionally, the interface is safe for lasers as it has a return loss (caused by reflection) of less than -30dB. © 2023 SPIE.

关键词： Silicon photonics

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SAW Resonators on 15°YX-LiNbO3/SiO2/Sapphire Substrate with Excellent Electromechanical Coupling

SAW Resonators on 15°YX-LiNbO3/SiO2/Sapphire Substrate with...

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IEEE International Frequency Control Symposium

作者： Jinbo Wu Yang Chen Liping Zhang Pengcheng Zheng Hulin Yao Xiaoli Fang Kai Huang Shibin Zhang Xin Ou The State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Shanghai China

SummaryIn this work, the shear horizontal surface acoustic wave (SH-SAW) resonators were demonstrated on 15° YX-LiNbO 3 /SiO 2 /sapphire (LiNbO 3 -on-sapphire, LNOS) substrate. Compared to the reported gigahertz SAW resonators based on piezoelectric heterogeneous substrates, the fabricated resonator in this work exhibits a state-of-the-art electromechanical coupling coefficient (k 2 ) of 42.2%, a maximum Bode-Q (Q max ) of 1457 and an excellent figure of merit (k 2 ×Q max ) of 615. Besides, several methods for suppressing transverse modes were implemented and compared. Tilted interdigital-transducers combined with the apodization technique can suppress the transverse modes more thoroughly while maintaining decent Q values. Overall, SAW devices based on the LNOS substrate have great potential for RF filters with low insertion loss, steep skirts, and wide bandwidth.

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