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| 1 | High-speed and high-power germanium photodetector with a lateral silicon nitride waveguide显示文摘Up to now, the light coupling schemes of germanium-on-silicon photodetectors(Ge-on-Si PDs) could be divided into three main categories:(1) vertical(or normal-incidence) illumination, which can be from the top or back of the wafer/chip, and waveguide-integrated coupling including(2) butt coupling and(3) evanescent coupling. In evanescent coupling the input waveguide can be positioned on top, at the bottom, or lateral to the absorber. Here,to the best of our knowledge, we propose the first concept of Ge-on-Si PD with double lateral silicon nitride(Si_(3)N_(4)) waveguides, which can serve as a novel waveguide-integrated coupling configuration: double lateral coupling. The Ge-on-Si PD with double lateral Si_(3)N_(4) waveguides features uniform optical field distribution in the Ge region, which is very beneficial to improving the operation speed for high input power. The proposed Ge-on-Si PD is comprehensively characterized by static and dynamic measurements. The typical internal responsivity is evaluated to be 0.52 A/W at an input power of 25 mW. The equivalent circuit model and theoretical 3 dB optoelectrical(OE) bandwidth investigation of Ge-on-Si PD with lateral coupling are implemented. Based on the small-signal(S21) radio-frequency measurements, under 4 mA photocurrent, a 60 GHz bandwidth operating at-3 V bias voltage is demonstrated. When the photocurrent is up to 12 mA, the 3 dB OE bandwidth still has 36 GHz. With 1 mA photocurrent, the 70, 80, 90, and 100 Gbit/s non-return-to-zero(NRZ) and 100,120, 140, and 150 Gbit/s four-level pulse amplitude modulation clear openings of eye diagrams are experimentally obtained without utilizing any offline digital signal processing at the receiver side. In order to verify the highpower handling performance in high-speed data transmission, we investigate the eye diagram variations with the increase of photocurrents. The clear open electrical eye diagrams of 60 Gbit/s NRZ under 20 mA photocurrent are also obtained. Overall, the proposed lateral Si_(3)N_(4) waveguide structure is flexibly extendable to a light coupling configuration of PDs, which makes it very attractive for developing high-performance silicon photonic integrated circuits in the future. | XIAO HU DINGYI WU HONGGUANG ZHANG WEIZHONG LI DAIGAO CHEN LEI WANG XI XIAO SHAOHUA YU | 2021 | Photonics Research2021，9，5： | 2 |
| 2 | Strain Hardening Associated with Dislocation,Deformation Twinning,and Dynamic Strain Aging in Fe–20Mn–1.3C–(3Cu) TWIP Steels显示文摘The effects of Cu on stacking fault energy,dislocation slip,mechanical twinning,and strain hardening in Fe–20Mn–1.3C twinning-induced plasticity(TWIP) steels were systematically investigated.The stacking fault energy was raised with an average slope of 2 mJ/m2 per 1 wt% Cu.The Fe–20Mn–1.3C–3Cu steel exhibited superior tensile properties,with the ultimate tensile strength reached at 2.27 GPa and elongation up to 96.9% owing to the high strain hardening that occurred.To examine the mechanism of this high strain hardening,dislocation density determination by XRD was calculated.The dislocation density increased with the increasing strain,and the addition of Cu resulted in a decrease in the dislocation density.A comparison of the strain-hardening behavior of Fe–20Mn–1.3C and Fe–20Mn–1.3C–3Cu TWIP steels was made in terms of modified Crussard–Jaoul(C–J) analysis and microstructural observations.Especially at low strains,the contributions of all the relevant deformation mechanisms—slip,twinning,and dynamic strain aging—were quantitatively evaluated.The analysis revealed that the dislocation storage was the leading factor to the increase of the strain hardening,while dynamic strain aging was a minor contributor to strain hardening.Twinning,which interacted with the matrix,acted as an effective barrier to dislocation motion. | Lingyan Zhao Dingyi Zhu Longlong Liu Zhenming Hu Mingjie Wang | 2014 | Acta Metallurgica Sinica(English Letters)2014，27，4： | 2 |
| 3 | 62 GHz germanium photodetector with inductive gain peaking electrode for photonic receiving beyond 100 Gbaud显示文摘Silicon photonics has attracted a great deal of interest for integrated photonics systems due to its large-scale electronics-photonics integration on a chip by leveraging the fabrication process of the complementary-metal-oxide semiconductor(CMOS)foundries[1−5].Germanium-on-silicon(Ge-on-Si)waveguide photodetector(PD)is an indispensable building block of silicon photonics technology which requires high sensitivity. | Dingyi Wu Xiao Hu Weizhong Li Daigao Chen Lei Wang Xi Xiao | 2021 | Journal of Semiconductors2021，42，2： | 1 |
| 4 | A fiber Fabry–Perot interferometer based on a PVA coating for humidity measurement显示文摘 | Dan Su Xueguang Qiao Qiangzhou Rong Hao Sun Jing Zhang Zhengyuan Bai Yanying Du Dingyi Feng Yupeng Wang Manli Hu Zhongyao Feng | 2013 | Optics Communications2013，，： | 1 |
| 5 | Temperature and refractive index sensing characteristics of an MZI-based multimode fiber–dispersion compensation fiber–multimode fiber structure显示文摘 | Hao Sun Shen Yang Jing Zhang Qiangzhou Rong Lei Liang Qinfang Xu Guanghua Xiang Dingyi Feng Yanying Du Zhongyao Feng Xueguang Qiao Manli Hu | 2012 | Optical Fiber Technology2012，，6： | 1 |
| 6 | 3D Printing Challenges in Enabling Rapid Response to Public Health Emergencies显示文摘The coronavirus disease 2019(COVID-19)epidemic has become a global public health emergency over last months.As of September 14th,over 28,000,000 confirmed cases and 917,000 deaths have been reported from all over the world.1 Its large-scale outbreak and pandemic cause an extreme shortage of personal protective equipment(PPE)andmedical supplies such as face masks,testing kits,nasopharyngeal swabs,and medical ventilators in the early stage,which consequently leads to the collapse of local medical systems.2 It turns out that measures like lockdown and travel bans are themost effective strategies in response to an epidemic at an early stage with insufficient knowledge.3 However,those physical isolation measures will inevitably result in work stoppages and have a great impact on industrial production.The supply of raw materials and components,and the production and transportation of final products are greatly restricted under a global supply chain.4 This further aggravates the shortage of anti-epidemic supplies and so the vicious cycle begins. | Dingyi Wang Junpeng Zhang Qian Liu Bolei Chen Yong Liang Ligang Hu Guibin Jiang | 2020 | The Innovation2020，1，3： | 0 |
| 7 | Constructing metal-free heterophotocatalyst using two-dimensional carbon nitride sheets and violet phosphorene for highly efficient visible-light photocatalysis显示文摘Two-dimensional(2D)carbon nitride sheets(CNs)with nanoscale thickness have great potential in solar energy conversion owing to their intrinsic bandgap.However,their photocatalytic efficiency falls far below the practical requirements because the generated electron-hole pairs rapidly recombine.We construct a metal-free 2D p–n junction heterophotocatalyst from CNs and violet phosphorene(VP)using a simple electrostatic self-assembly method.The experimental results and density functional theory calculations show that the built-in electric field of the p–n junction promotes photogenerated carrier transport at the heterojunction interface,thereby promoting the separation of photogenerated electron-hole pairs.Under visible-light illumination,the visible-light photocatalytic hydrogen and CO production rates of the CNs/VP heterojunction were increased by 5.85 and 1.51 times,respectively,when compared to that of CNs.This study provides new insights into the design of metal-free heterogeneous photocatalysts with high catalytic activity。 | Yong Wang Chengxin Zeng Liting Wu Yalin Dong Yu Zhang Dingyi Yang Wen Hu Jian Hao Hongzhe Pan Rusen Yang | 2023 | Journal of Materials Science & Technology2023，，15： | 0 |
| 8 | Prediction of Newhall navel orange internal quality based on digital microscopy显示文摘The traditional technology for internal quality detection of citrus fruit is believed to be destructive,inefficient,and error-prone.To address these issues,a novel method has been developed to evaluate nondestructively the sugar-acid ratio(SAR)of soluble solids by using the oil glands density(OGD).In this study,a total of 584 samples with different widths were collected.The sample data were correlated that the SAR and OGD decreased with time during storage.The relevance with time was significant between SAR and OGD of citrus positively correlated in the calibration group(R2=0.82),which indicated that OGD could be used to predict the internal quality of citrus.It indicated that a new generation of digital microscopy could provide an alternative to predict nondestructively the internal quality of citrus fruit,as well as some theoretical insight for further studies of online quality detection in the future. | Shumin Gao Cong Cao Dingyi Hu Rangwei Xu Yunjiang Cheng Hong Chen Ming Zhu Shanjun Li | 2021 | International Journal of Agricultural and Biological Engineering2021，14，6： | 0 |
| 9 | Designable heteronanocrystals via interface redox reaction显示文摘The synergistic interaction of different components in heteronanocrystals induces interfacial phenomena and novel functionalities.Nonetheless,effective technologies to design and fabricate heteronanocrystals with materials on demand are still missing.Rich heterostructures in a copper patina are known to form at room temperature and under atmospheric pressure.The redox process of copper tarnish inspired the discovery of a simple strategy to achieve heteronanocrystals that contained elements from group 3-11 and group 14-16.The interface redox-induced method is self-regulating at ambient conditions and applicable for metal,semiconductor,and dielectric materials.The enhanced interface bonding endows the heteronanocrystals with outstanding stability and catalytic performance,while the modular approach enables the design and fabrication of heteronanocrystals with intended materials to meet different purposes. | Zhihua Li Yang Li Nannan Luo Yuanyuan Qie Dingyi Yang Guowei Cao Yuxiang Liu Ying Fu Na Li Wen Hu Min Zhang Rusen Yang Bo Tang | 2023 | Nano Research2023，16，4： | 0 |
| 10 | 67 GHz light-trapping-structure germanium photodetector supporting 240 Gb/s PAM-4 transmission显示文摘A light-trapping-structure vertical Ge photodetector(PD)is demonstrated.In the scheme,a 3μm radius Ge mesa is fabricated to constrain the optical signal in the circular absorption area.Benefiting from the light-trapping structure,the trade-off between bandwidth and responsivity can be relaxed,and high opto-electrical bandwidth and high responsivity are achieved simultaneously.The measured 3 d B bandwidth of the proposed PD is around67 GHz,and the responsivity is around 1.05 A/W at wavelengths between 1520 and 1560 nm.At 1580 nm,the responsivity is still over 0.78 A/W.A low dark current of 6.4 n A is also achieved at-2 V bias voltage.Based on this PD,a clear eye diagram of 100 GBaud four-level pulse amplitude modulation(PAM-4)is obtained.With the aid of digital signal processing,240 Gb/s PAM-4 signal back-to-back transmission is achieved with a bit error ratio of 1.6×10^(-2).After 1 km and 2 km fiber transmission,the highest bit rates are 230 and 220 Gb/s,respectively. | DAIGAO CHEN HONGGUANG ZHANG MIN LIU XIAO HU YUGUANG ZHANG DINGYI WU PEIQI ZHOU SIYAO CHANG LEI WANG XI XIAO | 2022 | Photonics Research2022，10，9： | 0 |
| 11 | The potential of 3D printing in facilitating carbon neutrality显示文摘At present,dramatically reduction of fossil fuel usage is regarded as a major initiative to achieve the carbon neutrality goal.Nevertheless,current energy policies are unlikely to achieve the climate goal without sacrificing economic development and people’s livelihood because fossil fuels are currently the dominant energy source.As an environment-friendly manufacturing technology,three-dimensional printing(3DP)is flourishing and is considered beneficial to energy structure adjustment and industrial upgrading.Despite this,its potential to contribute to global carbon neutrality has not attracted enough attention.Herein,we explore the application of 3DP and its potential facilitating carbon neutrality from crucial sectors and applications including manufacturing,construction energy,livestock,and carbon capture and storage(CCS)technologies.The additive manufacturing and decentralized manufacturing characteristics of 3DP allow reducing greenhouse gas(GHG)emissions in manufacturing and construction sectors by optimized and lightweight designs,reduced material and energy consumption,and shortened transport processes.In addition,3DP enables the precise manufacturing of customized complex structures and the expansion of functional materials,which makes 3DP an innovative alternative to the development of novel energy-related devices,cultured meat production technology,and CCS technologies.Despite this,the majority of applications of 3DP are still in an early stage and need further exploration.We call for further research to precisely evaluate the GHG emission reduction potential of 3DP and to make it better involved and deployed to better achieve carbon neutrality. | Dingyi Wang Tingting Zhang Xudong Guo Dayi Ling Ligang Hu Guibin Jiang | 2023 | Journal of Environmental Sciences2023，，8： | 0 |
| 12 | 408 Gbit/s PAM-8 sidewall-doped germanium-silicon photodetector显示文摘Based on the 90 nm silicon photonics commercial foundry,sidewall-doped germanium-silicon photodetectors(PDs)are designed and fabricated.The large designed overlap between the optical field and electric field achieves high responsivity while retaining high-speed performance.Even including the loss due to optical fiber coupling,the PD demonstrates an external responsivity greater than 0.55 A/W for transverse magnetic(TM)polarization and 0.65 A/W for transverse electric(TE)polarization at 1530 nm.A flat responsivity spectrum of>0.5 A/W is achieved up to 1580 nm for both polarizations.Their internal responsivities can exceed 1 A/W in the C+L optical communication bands.Furthermore,with the aid of a 200 mm wafer-level test and analysis,the overall PDs of 26 reticles have a 3 dB optoelectrical bandwidth>50 GHz and a dark current<10 nA at a-3 V bias voltage.Finally,the eye diagram performances under TE and TM polarizations,various modulation formats,and different input wavelengths are comprehensively investigated.The clear open electrical eye diagrams up to 120,130,140,and 150 Gbit/s nonreturn-to-zero are experimentally attained at a photocurrent of 1 m A.To the best of our knowledge,this is the first time that single-lane direct detection of record-high-speed 200,224,256,and290 Gbit/s four-level pulse amplitude modulation(PAM)and 300,336,384,and 408 Gbit/s eight-level PAM optical signals has been experimentally achieved. | XIAO HU DINGYI WU YE LIU DAIGAO CHEN LEI WANG XI XIAO SHAOHUA YU | 2023 | Photonics Research2023，11，6： | 0 |
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