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Enhanced Cross-Phase Modulation via Phase Control in a Quantum dot Nanostructure 认领 引用 被引量：5
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作者 郝向英 郑安寿 +1 位作者 王英 李小刚 《Communications in Theoretical Physics》 SCIE CAS CSCD 2012年第5期866-872,共7页
A four-level quantum dot (QD) nanostructure interacting with four fields (two weak near-infrared (NIR) pulses and two control fields) forms the well-known double-cascade configuration.We investigate the cross-phase mo... A four-level quantum dot (QD) nanostructure interacting with four fields (two weak near-infrared (NIR) pulses and two control fields) forms the well-known double-cascade configuration.We investigate the cross-phase modulation (XPM) between the two NIR pulses.The results show,in such a closed-loop scheme,that the XPM can be greatly enhanced,while the linear absorption and two-photon absorption (gain) can be efficiently depressed by tuning the relative phase among the applied fields.This protocol may have potential applications in NIR all-optical switch design and quantum information processing with the solid-state materials. 展开更多
关键词 cross-phase modulation （XPM） phase control quantum dot （QD）
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Cross-phase modulation instability in optical fibres with exponential saturable nonlinearity and high-order dispersion 认领 引用 被引量：4
2
作者 钟先琼 向安平 《Chinese Physics B》 SCIE EI CAS 2010年第6期356-361,共6页
Utilizing the linear-stability analysis, this paper analytically investigates and calculates the condition and gain spectra of cross-phase modulation instability in optical fibres in the ease of exponential saturable ... Utilizing the linear-stability analysis, this paper analytically investigates and calculates the condition and gain spectra of cross-phase modulation instability in optical fibres in the ease of exponential saturable nonlinearity and high-order dispersion. The results show that, the modulation instability characteristics here are similar to those of conventional saturable nonlinearity and Kerr nonlinearity. That is to say, when the fourth-order dispersion has the same sign as that of the second-order one, a new gain spectral region called the second one which is far away from the zero point may appear. The existence of the exponential saturable nonlinearity will make the spectral width as well as the peak gain of every spectral region increase with the input powers before decrease. Namely, for every spectral regime, this may lead to a unique value of peak gain and spectral width for two different input powers. In comparison with the case of conventional saturable nonlinearity, however, when the other parameters are the same, the variations of the spectral width and the peak gain with the input powers will be faster in case of exponential saturable nonlinearity. 展开更多
关键词 nonlinear optics cross-phase modulation instability exponential saturable nonlinearity high-order dispersion
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Effects of walk-off on cross-phase modulation induced modulation instability in an optical fibre with high-order dispersion 认领 引用 被引量：1
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作者 钟先琼 向安平 《Chinese Physics B》 CAS 2007年第6期1683-1688,共6页
This paper investigates the effects of walk-off among optical pulses on cross-phase modulation induced modulation instability in the normal dispersion region of an optical fibre with high-order dispersion. The results... This paper investigates the effects of walk-off among optical pulses on cross-phase modulation induced modulation instability in the normal dispersion region of an optical fibre with high-order dispersion. The results indicate that, in the case of high-order dispersion, the walk-off effect takes on new characteristics and will influence considerably the shape, position and especially the number of the spectral regions of the gain spectra of modulation instability. Not only the group-velocity mismatch, but also the difference of the third-order dispersion of two optical waves will alter the gain spectra of modulation instability but in different ways. Depending on the values of the walk-off parameters, the number of the spectral regions may increase from two to at most four, and the spectral shape and position may change too. 展开更多
关键词 modulation instability cross-phase modulation walk-off effect the difference ofthe third-order dispersion
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Transverse manipulation of particles using Bessel beam of tunable size generated by cross-phase modulation 认领 引用
4
作者 乔响来 程雪梅 +3 位作者 张倩 张文定 任兆玉 白晋涛 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第4期747-753,共7页
We report on a method to achieve multiple microscopic particles being trapped and manipulated transversely by using a size-tunable Bessel beam generated by cross-phase modulation(XPM)based on the thermal nonlinear opt... We report on a method to achieve multiple microscopic particles being trapped and manipulated transversely by using a size-tunable Bessel beam generated by cross-phase modulation(XPM)based on the thermal nonlinear optical effect.The results demonstrate that multiple polystyrene particles can be stably trapped simultaneously,and the number of the trapped particles can be controlled by varying the trapping beam power.In addition,the trapped particles can be manipulated laterally with micron-level precision by changing the size of J0Bessel beam.This work provides a simple but efficient way to trap and manipulate multiple particles simultaneously,which would have potential applications in many fields such as cell sorting and transportation. 展开更多
关键词 optical manipulation optical trapping J0Bessel beam cross-phase modulation
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Evolution of Hyperbolic-Secant Pulses Towards Cross-Phase Modulation Induced Optical Wave Breaking and Soliton or Soliton Trains Generation in Quintic Nonlinear Fibers 认领 引用
5
作者 钟先琼 张晓霞 +2 位作者 杜仙童 刘永 程科 《Communications in Theoretical Physics》 SCIE CAS CSCD 2015年第10期447-463,共17页
The approximate analytical frequency chirps and the critical distances for cross-phase modulation induced optical wave breaking(OWB) of the initial hyperbolic-secant optical pulses propagating in optical fibers with q... The approximate analytical frequency chirps and the critical distances for cross-phase modulation induced optical wave breaking(OWB) of the initial hyperbolic-secant optical pulses propagating in optical fibers with quintic nonlinearity(QN) are presented. The pulse evolutions in terms of the frequency chirps, shapes and spectra are numerically calculated in the normal dispersion regime. The results reveal that, depending on different QN parameters, the traditional OWB or soliton or soliton pulse trains may occur. The approximate analytical critical distances are found to be in good agreement with the numerical ones only for the traditional OWB whereas the approximate analytical frequency chirps accords well with the numerical ones at the initial evolution stages of the pulses. 展开更多
关键词 optical wave breaking cross-phase modulation quint
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Supercontinuum Generation Enhanced by Cross-phase Modulation in Dispersion-flattened and Decreasing Fiber 认领 引用 被引量：1
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作者 XUWen-cheng XUYong-zhao YUBing-tao CUIHu CHENYong-zhu LIUSong-hao 《Semiconductor Photonics and Technology》 2005年第2期116-121,共6页
Supercontinuum spectrum generation in a dispersion-flattened and decreasing fiber with two orthogonally polarized pulses was simulated and calculated. The research results indicated that the supercontinuum spectrum ge... Supercontinuum spectrum generation in a dispersion-flattened and decreasing fiber with two orthogonally polarized pulses was simulated and calculated. The research results indicated that the supercontinuum spectrum generated by two orthogonally polarized pulses is wider and flatter than that generated by single polarized pulse due to cross-phase modulation. The cross-phase modulation effect can enhance the supercontinuum spectrum generation. When the pump power of the input pulse is lower, the enhancement of supercontinuum spectrum generation by cross-phase modulation effect is more significant. 展开更多
关键词 fiber optics supercontinuum spectrum dispersion-flattened and decreasingfiber cross-phase modulation soliton trapping
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Channel Capacity of DWDM Networks with Cross-phase Modulation Effect 认领 引用
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作者 QI Jun-xuan WEN Shuang-cun 《Semiconductor Photonics and Technology》 2006年第1期51-53,共3页
In dense wavelength division multiplexing(DWDM) optical transmission systems, cross phase modulation(XPM) due to Kerr effect causes phase shift and intensity modulation in each channel, which will lead the channel cap... In dense wavelength division multiplexing(DWDM) optical transmission systems, cross phase modulation(XPM) due to Kerr effect causes phase shift and intensity modulation in each channel, which will lead the channel capacity to be a random variable. An expression of the channel capacity dealing with XPM effect is presented, and the correctness and accuracy of this method are demonstrated by numerical simulation. 展开更多
关键词 Fiber nonlinearity Information theory Optical fiber communication systems, Cross-phase modulation
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Laser-optical-field-modulation fabricating large-aperture dual-band antireflection windows for MWIR and LWIR imaging 认领 引用 被引量：2
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作者 Yulong Ding Cong Wang +8 位作者 Xianshi Jia Linpeng Liu Zheng Gao Xiang Jiang Shiyu Wang Dejin Yan Nai Lin Zhou Li Ji’an Duan 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2026年第2期560-574,共15页
Dual-band antireflection(DBAR)windows based on surface microstructures offer a promising solution for mid-wave infrared(MWIR)and long-wave infrared(LWIR)co-aperture composite imaging.However,micro-nano manufacturing t... Dual-band antireflection(DBAR)windows based on surface microstructures offer a promising solution for mid-wave infrared(MWIR)and long-wave infrared(LWIR)co-aperture composite imaging.However,micro-nano manufacturing technology faces significant challenges in efficiently producing highly uniform microstructures with characteristic dimensions of∼1μm across hundreds of millimeters.Here,we report a laser optical field modulation(LOFM)technology for the rapid manufacture of ultra-large-scale arrays of antireflection microholes(ARMHs)on large-aperture and non-perfectly planar windows.LOFM technology,which modulates laser pulses in both temporal and spatial domains,enhances ARMH aspect ratios from 0.1 to 0.8 without reducing manufacturing time,and maintains processing accuracy even with laser focus shifts,thereby addressing inconsistencies in large-area processing.As a proof of concept,approximately 7 billion ARMHs are fabricated on a 100-mm-diameter zinc sulfide(ZnS)window at a rate of 20000 holes per second using LOFM technology assisted by machine learning.The fabricated DBAR ZnS window exhibits ultra-broadband(3.5−14μm),high transmittance(91.1%),wide-angle transmission,wear-resistant,and self-cleaning,making it suitable for environments with multiple interference factors.Dual-band imaging applications demonstrate the significant advantages of DBAR windows in target recognition,multi-scenario robustness,and information acquisition. 展开更多
关键词 laser optical field modulation large-aperture window non-perfectly planar antireflection microstructure dual-band infrared imaging
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Modulation of mitochondrial dysfunction:Mechanisms and strategies for the use of natural products to treat stroke 认领 引用 被引量：3
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作者 Na Qin Rujuan Liu +3 位作者 Rong Deng Liuliu Shi Lei Wang Ting Zhu 《Neural Regeneration Research》 SCIE CAS CSCD 2026年第6期2215-2226,共12页
Modulations of mitochondrial dysfunction,which involve a series of dynamic processes such as mitochondrial biogenesis,mitochondrial fusion and fission,mitochondrial transport,mitochondrial autophagy,mitochondrial apop... Modulations of mitochondrial dysfunction,which involve a series of dynamic processes such as mitochondrial biogenesis,mitochondrial fusion and fission,mitochondrial transport,mitochondrial autophagy,mitochondrial apoptosis,and oxidative stress,play an important role in the onset and progression of stroke.With a better understanding of the critical role of mitochondrial dysfunction modulations in post-stroke neurological injury,these modulations have emerged as a potential target for stroke prevention and treatment.Additionally,since effective treatments for stroke are extremely limited and natural products currently offer some outstanding advantages,we focused on the findings and mechanisms of action related to the use of natural products for targeting mitochondrial dysfunction in the treatment of stroke.Natural products achieve neuroprotective through multi-target regulation of mitochondrial dysfunction encompassing the following processes:(1)Mitochondrial biogenesis:Cordyceps and hydroxysafflor yellow A activate the peroxisome proliferator-activated receptor gamma coactivator 1-alphauclear respiratory factor pathway,promote mitochondrial DNA replication and respiratory chain protein synthesis,and thereby restore energy supply in the ischemic penumbra.(2)Mitochondrial dynamics balance:Ginsenoside Rb3 promotes Opa1-mediated neural stem cell migration and diffusion for recovery of damaged brain tissue.(3)Mitochondrial autophagy:Gypenoside XVII selectively eliminates damaged mitochondria via the phosphatase and tensin homolog-induced kinase 1/Parkin pathway and blocks reactive oxygen species and the NOD-like receptor protein 3 inflammasome cascade,thereby alleviating blood-brain barrier damage.(4)Anti-apoptotic mechanisms:Ginkgolide K inhibits Bax mitochondrial translocation and downregulates caspase-3/9 activity,reducing neuronal programmed death induced by ischemia-reperfusion.(5)Oxidative stress regulation:Scutellarin exerts antioxidant properties and improves neurological function by modulating the extracellular signal-regulated kinase 5-Kruppel-like factor 2-endothelial nitric oxide synthase signaling pathway.(6)Intercellular mitochondrial transport:Neuroprotective effects of Chrysophanol are associated with accelerated mitochondrial transfer from astrocytes to neurons.Existing studies have confirmed that natural products exhibit neuroprotective effects through multidimensional interventions targeting mitochondrial dysfunction in both ischemic and hemorrhagic stroke models.However,their clinical translation still faces challenges,such as the difficulty in standardization due to component complexity,insufficient cross-regional clinical data,and the lack of long-term safety evaluations.Future research should aim to integrate new technologies,such as single-cell sequencing and organoid models,to deeply explore the mitochondria-targeting mechanisms of natural products and validate their efficacy through multicenter clinical trials,providing theoretical support and translational pathways for the development of novel anti-stroke drugs. 展开更多
关键词 apoptosis autophagy hemorrhagic stroke ischemic stroke mitochondrial biogenesis mitochondrial dynamics mitochondrial dysfunction modulations mitochondrial transport natural products oxidative stress
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Atomic-scale ultrafast laser processing of nanocrystal with plasmonic modulation for machine learning combined flexible sensor devices 认领 引用 被引量：1
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作者 Ma Luo Jiaqun Li +6 位作者 Jiawang Xie Haoze Han Jianfeng Yan Yuzhi Zhao Yaoyao Li Huhu Cheng Liangti Qu 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2026年第2期620-638,共19页
Nanometallic materials have attracted wide research attention in the fabrication of functional devices,including flexible electronics circuits and high-sensitive sensors.Sintering of nanometallic materials is generall... Nanometallic materials have attracted wide research attention in the fabrication of functional devices,including flexible electronics circuits and high-sensitive sensors.Sintering of nanometallic materials is generally thought as an effective technology for the functional manufacturing,and the controllable sintering of nanometallic materials and its major mechanisms have long been a challenge.Here,an ultrafast laser processing strategy for Ag nanoparticles(NPs)is achieved by modulating plasmonic.The excitation mode of plasmon can be designed by laser parameters,including polarization with a specific crystal size.The atomic-scale ultrafast dynamics are revealed for understanding the sintering process and design of the sintered structures.The non-equilibrium energy transfer between electron and lattice and dynamic evolution of pressure are proved to be the foremost driving forces on the motion of atomic structures.Through research of plasmonic-induced electric field enhancement and non-uniform deposition of heat and in-situ observation of relative transmittance,mapping from atomic-scale structure to micro behavior is established.Based on plasmonic modulation and processing of Ag NPs,a machine learning combined flexible gesture sensor with high recognition accuracy is displayed.This work expands the knowledge of interactions between lasers and nanometallic materials and provides a method for designing functional devices for a wide range of applications. 展开更多
关键词 ultrafast laser fabrication plasmonic modulation atomic scale processing flexible devices
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Memory-enhanced noiseless cross-phase modulation 认领 引用
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作者 Mahdi Hosseini Stojan Rebic +3 位作者 Ben M Sparkes Jason Twamley Ben C Buchler Ping K Lam 《Light: Science & Applications》 SCIE EI 2012年第1期6-10,共5页
Large nonlinearity at the single-photon level can pave the way for the implementation of universal quantum gates.However,realizing large and noiseless nonlinearity at such low light levels has been a great challenge f... Large nonlinearity at the single-photon level can pave the way for the implementation of universal quantum gates.However,realizing large and noiseless nonlinearity at such low light levels has been a great challenge for scientists in the past decade.Here,we propose a scheme that enables substantial nonlinear interaction between two light fields that are both stored in an atomic memory.Semiclassical and quantum simulations demonstrate the feasibility of achieving large cross-phase modulation(XPM)down to the single-photon level.The proposed scheme can be used to implement parity gates from which CNOT gates can be constructed.Furthermore,we present a proof of principle experimental demonstration of XPM between two optical pulses:one stored and one freely propagating through the memory medium. 展开更多
关键词 CNOT gate cross-phase modulation electromagnetically induced transparency parity gate quantum memory
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N,W-Cooperative Modulation of Ni3S2for Efficient Electrocatalytic Oxidation of 5-Hydroxymethylfurfural to 2,5-Furandicarboxylic Acid 认领 引用
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作者 Cheng-Feng Yi Jing-Wen Li +3 位作者 Jia-Rui Li Bing-Chuan Xue Xing Lin Zhi-Gang Liu 《Rare Metals》 SCIE EI CAS CSCD 2026年第2期372-382,共11页
Ni3S2 has emerged as a promising catalyst for the electrochemical oxidation of biomass-derived 5-hydroxymethylfurfural (HMF)to 2,5-furandicarboxylic acid (FDCA),driven by its distinctive physicochemical properti... Ni3S2 has emerged as a promising catalyst for the electrochemical oxidation of biomass-derived 5-hydroxymethylfurfural (HMF)to 2,5-furandicarboxylic acid (FDCA),driven by its distinctive physicochemical properties.However,its practical catalytic efficiency is severely hindered by abundant electrochemically inactive surface sites and poor electronic conductivity.To overcome these challenges,an N,W-cooperative modulation of Ni3S2 catalyst (N,W-Ni3S2),featuring an engineered crystalline-amorphous heterostructure,is designed,utilizing 5,10,15,20-tetraphenylporphine (TPP) as the N source.This innovative architecture integrates W-doped crystalline Ni3S2 and N-doped amorphous carbon,which synergistically enhances charge transport and induces interfacial charge polarization,substantially boosting catalytic activity.The optimized N,W-Ni3S2 demonstrates unprecedented electrocatalytic performance for the oxidation of HMF to FDCA,achieving 100%HMF conversion,97%FDCA yield,and 97%Faradaic efficiency,with over 95%retention in both FDCA yield and Faradaic efficiency across 10 consecutive cycles.Theoretical calculations and experimental results unveil that N incorporation exerts a more profound influence than W in reshaping the electronic landscape of Ni3S2,triggering an asymmetric electron redistribution at the heterogeneous interface.This unique electronic perturbation depletes the electron density around Ni active sites,creating an electron-deficient state that dramatically promotes the in situ generation of NiOOH as the true active species.Furthermore,the tailored electronic environment significantly lowers the energy barrier for the rate-determining step in the oxidation pathway,thereby enabling near-quantitative FDCA production with high efficiency. 展开更多
关键词 2,5-furandicarboxylic acid 5-hydroxymethylfurfural crystalline-amorphous heterostructure N modulation Ni3S2 W modulation
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A universal CNN-Based approach for modulation period estimation 认领 引用
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作者 Xuguang Xu updates Hang Zhu +4 位作者 Ming Tan Xiaojun Zou Wei Song Lixun Han Xuguang Xu 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第4期69-92,共24页
This paper presents a universal framework for estimating the modulation period of signals with periodic modulation characteristics,applicable to communications,radar,and other radio systems.A key innovation is the int... This paper presents a universal framework for estimating the modulation period of signals with periodic modulation characteristics,applicable to communications,radar,and other radio systems.A key innovation is the introduction of a computationally efficient modulation period spectrum,derived from the dynamic segmentation covariance matrix,which helps mitigate the effects of non-synchronous reception.To resolve estimation ambiguities caused by multiple spectral peaks,a convolutional neural network(CNN)is employed to classify the structural patterns of covariance matrices associated with these peaks,enabling precise period identification.Furthermore,to enhance overall efficiency,a separate CNN-based coarse estimation stage is designed using Hankel covariance cumulative matrices to narrow down the search range prior to refined estimation.Simulation results demonstrate that the proposed two-step approach—coarse search range estimation followed by precise period determination—achieves high accuracy without prior knowledge of the modulation scheme,offering significant advantages in non-cooperative signal processing scenarios. 展开更多
关键词 Modulation period Periodic modulation characteristics Non-synchronous reception Dynamic segmentation covariance matrix Hankel covariance cumulative matrix Convolutional neural network Non-cooperative signal processing
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Evaluation of Reinforcement Learning-Based Adaptive Modulation in Shallow Sea Acoustic Communication 认领 引用
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作者 Yifan Qiu Xiaoyu Yang +1 位作者 Feng Tong Dongsheng Chen 《哈尔滨工程大学学报（英文版）》 CSCD 2026年第1期292-299,共8页
While reinforcement learning-based underwater acoustic adaptive modulation shows promise for enabling environment-adaptive communication as supported by extensive simulation-based research,its practical performance re... While reinforcement learning-based underwater acoustic adaptive modulation shows promise for enabling environment-adaptive communication as supported by extensive simulation-based research,its practical performance remains underexplored in field investigations.To evaluate the practical applicability of this emerging technique in adverse shallow sea channels,a field experiment was conducted using three communication modes:orthogonal frequency division multiplexing(OFDM),M-ary frequency-shift keying(MFSK),and direct sequence spread spectrum(DSSS)for reinforcement learning-driven adaptive modulation.Specifically,a Q-learning method is used to select the optimal modulation mode according to the channel quality quantified by signal-to-noise ratio,multipath spread length,and Doppler frequency offset.Experimental results demonstrate that the reinforcement learning-based adaptive modulation scheme outperformed fixed threshold detection in terms of total throughput and average bit error rate,surpassing conventional adaptive modulation strategies. 展开更多
关键词 Adaptive modulation Shallow sea underwater acoustic modulation Reinforcement learning
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Beyond conventional therapies:Gut microbiota modulation and macromolecular drugs in the battle against cardiometabolic diseases 认领 引用
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作者 Jingyue Wang Jing Qu +7 位作者 Mengliang Ye Ru Feng Xiang Hui Xinyu Yang Jingyu Jin Qian Tong Xianfeng Zhang Yan Wang 《Journal of Pharmaceutical Analysis》 SCIE CAS CSCD 2026年第1期100-119,共20页
Cardiometabolic diseases(CMDs)represent an ongoing major global health challenge,driven by complex interactions among genetic,environmental,microbiome-related,and other factors.While smallmolecule drugs and lifestyle ... Cardiometabolic diseases(CMDs)represent an ongoing major global health challenge,driven by complex interactions among genetic,environmental,microbiome-related,and other factors.While smallmolecule drugs and lifestyle interventions can provide clinical benefits,they are possible to be constrained by the limited druggability of key target proteins,the potential risks of off-target effects,and difficulties in maintaining long-term adherence.In recent years,gut microbiota modulation and macromolecular drugs have emerged as promising therapeutic strategies.Gut microbiota modulation(e.g.,probiotics,synbiotics,or natural products)exerts systemic metabolic and immune effects,supporting a therapeutic approach targeting multiple diseases.Meanwhile,macromolecular drugs(e.g.,peptides,antibodies,and small nucleic acids)offer precise,pathway-targeted interventions.Despite advancements,limitations remain in addressing ethical considerations in microbiota modulation and optimizing targeted delivery systems,all of which may hinder clinical translation.Here,we provide a comprehensive overview of therapeutic approaches for CMDs,with a focus on obesity,type 2 diabetes mellitus(T2DM),and atherosclerosis(AS).The review is structured around three key aspects:i)conventional therapies,including small-molecule drugs and lifestyle interventions;ii)emerging therapies encompassing gut microbiota modulation,macromolecular drugs,and their interactions;and iii)challenges and opportunities for comorbidity management,microbiota ethics,and artificial intelligence(AI)-driven therapeutic optimization.We hope this review enhances the understanding of smallmolecule drugs,lifestyle interventions,gut microbiota modulation,and macromolecular drugs in the management of CMDs,thereby fostering medical innovation and contributing to the development of system-based comprehensive therapeutic paradigms. 展开更多
关键词 Cardiometabolic diseases Conventional therapies Gut microbiota modulation Macromolecular drugs Opportunities
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Tea polyphenol polymer film enables broadband optical modulation for hybrid mode-locked ultrafast fiber lasers 认领 引用
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作者 Wei Chen Kang Li +4 位作者 Cheng Gao Qingping Hu Zhengfan Li Yi Xiong Yunzhou Sun 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第2期442-450,共9页
Materials exhibiting broadband nonlinear optical responses are critically important for ultrafast photonics applications,particularly as saturable absorbers(SAs)that facilitate broadband optical pulse generation.In th... Materials exhibiting broadband nonlinear optical responses are critically important for ultrafast photonics applications,particularly as saturable absorbers(SAs)that facilitate broadband optical pulse generation.In this study,tea polyphenolpolyvinyl alcohol(TP-PVA)composite films are synthesized via a polymer embedding method and employed as SAs to initiate ultrafast pulse operation in fiber lasers.The TP-PVA SA film exhibits excellent broadband saturable absorption performance at wavelengths of 1.0μm,1.5μm,and 2.0μm,with modulation depths of 54.21%,41.41%,and 51.16%,respectively.Stable passively mode-locked pulses with pulse widths of 588 fs,419 fs,and 743 fs are generated in Yb-,Er-,and Tm-doped fiber lasers,respectively.This work confirms the effective performance of TP-PVA as a broadband SA,and establishes a foundation for the integration of novel and sustainable materials within ultrafast photonic systems.The approach paves the way for developing compact broadband ultrafast laser systems operating in the near-infrared spectral region. 展开更多
关键词 ultrafast fiber lasers saturable absorbers broadband modulators natural dyes tea polyphenol
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Electronic modulation of Pd nanoparticles by thioether-functionalized covalent organic framework for efficient ethanol oxidation 认领 引用
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作者 Haichang Fu Zihan Zhou +9 位作者 Yiting Zhang Yukun Gu Yuheng Yang Kexin Li Xinyu Li Hua Yan Yanxian Jin Dan Chen Kai Huang Zhangxin Chen 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第7期426-436,I0011,共11页
Developing electrocatalysts that combine high catalytic activity with efficient C-C bond cleavage remains a major challenge in the ethanol oxidation reaction(EOR).Tuning the electronic metal-support interaction(EMSI)h... Developing electrocatalysts that combine high catalytic activity with efficient C-C bond cleavage remains a major challenge in the ethanol oxidation reaction(EOR).Tuning the electronic metal-support interaction(EMSI)has attracted considerable attention as a promising strategy for designing high-performance catalysts.Herein,we report the rational design of a thioether-functionalized covalent organic framework(COF-S)via thiol-ene click chemistry.The strong interaction between the thioether groups and Pd nanoparticles(NPs)enables effective immobilization of Pd NPs within the COF-S framework.The resulting Pd/COF-S catalyst exhibits exceptional activity and stability for the EOR,delivering a mass activity of 2.99 A mgPd-1—substantially higher than those of Pd/COF-V(1.60 A mgPd-1)and commercial Pd/C(0.58 A mgPd-1).In situ FTIR spectroscopy combined with theoretical calculations reveals that the thioether-containing Pd/COF-S catalyst promotes C-C bond cleavage during the EOR.The introduction of thioether groups optimizes the electronic structure of Pd by up-shifting its d-band center,which facilitates C-C bond cleavage and enhances the catalytic activity performance.This work offers an effective strategy for boosting the activity and selectivity of Pd-based catalysts through rational support design and electronic structure modulation. 展开更多
关键词 Electronic modulation Thiol-ene click chemistry Covalent organic framework Pd catalysts Ethanol electrooxidation
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Facet modulation promotes synergy between TiO2 nanomaterials and dissolved organic matter in photocatalytic generation of reactive oxygen species 认领 引用
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作者 Qianwu Wang Fangru He +4 位作者 Yaqi Liu Jingxiang Low Chuanjia Jiang Tong Zhang Wei Chen 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第7期253-260,共8页
The efficiency of reactive oxygen species(ROS)generation is the most critical factor controlling the performance of photocatalytic water treatment.Dissolved organic matter(DOM),a ubiquitous and photoedox-active consti... The efficiency of reactive oxygen species(ROS)generation is the most critical factor controlling the performance of photocatalytic water treatment.Dissolved organic matter(DOM),a ubiquitous and photoedox-active constituent in natural and waste waters,may significantly interfere with the rate and pathways of ROS generation.Here,we show that modulating exposed facets of nano-catalysts to regulate the interactions between DOM and nanomaterials can boost ROS production.Specifically,electron paramagnetic resonance spectroscopy and probe test demonstrate that the production rate of superoxide radical anion(O2•-)in a system containing{001}-faceted TiO2nanocrystals and humic/fulvic acid far exceeds those in the systems containing TiO2or DOM alone.In comparison,the synergy between{101}-faceted nano-TiO2and humic/fulvic acid is much less prominent.Enhanced production of singlet oxygen(1O2)is also observed for{001}-faceted nano-TiO2in the presence of DOM,whereas 1O2production by{101}-faceted TiO2is subdued by DOM.Moreover,the{001}-faceted material is much more robust against the inhibition effect of DOM on hydroxyl radical(•OH)production.Thermogravimetric analysis reveals distinct DOM adsorption capacities between the materials.By spectroscopic and electrochemical analyses,we further elucidate the structure-activity relationship between exposed facets and rate-limiting factors in ROS generation.Exposed facets regulate the specific mode of interaction between TiO2 and DOM,which subsequently determines the charge carrier separation,adsorption of O2,as well as quenching of photogenerated holes and ROS.The findings provide deeper insights for improving the efficacy of photocatalytic water treatment through facet engineering of semiconductors. 展开更多
关键词 Facet modulation Reactive oxygen species Photocatalytic water treatment Nanomaterials Dissolved organic matter
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Peak current reduction in presence of RF phase modulationin the dual RF system 认领 引用
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作者 Jiang Bocheng Zhang Yao Tsai Cheng-Ying 《强激光与粒子束》 CAS CSCD 北大核心 2026年第1期160-165,共6页
[Background]High harmonic cavities are widely used in electron storage rings to lengthen thebunch,lower the bunch peak current,thereby reducing the IBS effect,enhancing the Touschek lifetime,as well asproviding Landau... [Background]High harmonic cavities are widely used in electron storage rings to lengthen thebunch,lower the bunch peak current,thereby reducing the IBS effect,enhancing the Touschek lifetime,as well asproviding Landau damping,which is particularly important for storage rings operating with ultra-low emittance or atlow beam energy.[Purpose]To further increase the bunch length without additional hardware costs,the phasemodulation in a dual-RF system is considered.[Methods]In this paper,turn-by-turn simulations incorporating randomsynchrotron radiation excitation are conducted,and a brief analysis is presented to explain the bunch lengtheningmechanism.[Results]Simulation results reveal that the peak current can be further reduced,thereby mitigating IBSeffects and enhancing the Touschek lifetime.Although the energy spread increases,which tends to reduce thebrightness of higher-harmonic radiation from the undulator,the brightness of the fundamental harmonic can,in fact,beimproved. 展开更多
关键词 dual high-frequency system phase modulation beam bunch stretching intra-beam scattering
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Design and optimization of area-selective carrier modulation in β-Ga2O3through high temperature oxygen annealing 认领 引用
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作者 Qiuyan Li Qiming He +3 位作者 Jinyang Liu Xuanze Zhou Guangwei Xu Shibing Long 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第5期227-234,共8页
Carrier modulation in beta-gallium oxide(β-Ga2O3)films through an oxygen annealing method is systematically investigated,including annealing time and annealing cap layer(ACL)design.Capacitance-voltage measureme... Carrier modulation in beta-gallium oxide(β-Ga2O3)films through an oxygen annealing method is systematically investigated,including annealing time and annealing cap layer(ACL)design.Capacitance-voltage measurement conducted on vertical SBD structures was used to evaluate the carrier concentration after annealing.The formation of a“surface layer”may suppress the diffusion of oxygen species as the annealing time increases.An 8-hour annealing time resulted in a carrier modulation with an approximately 3-µm-deep low-carrier-concentration layer.The annealing cap layer,consisting of polySi and SiO2,was deposited and patterned to achieve area-selective carrier modulation inβ-Ga2O3.The effective thickness of poly-Si for blocking oxygen diffusion was confirmed by scanning electron microscopy(SEM)for the first time.A definite thickness of SiO2served as both etching stop layer and lift-off layer for poly-Si.According to simulation results,the non-ideal surface caused extra high peak electric field in theβ-Ga2O3device.A combination of an optimized dry etching method and low-compressive-stress deposition technology was employed to eliminate the bird's beak-like shape structure that appeared at the edges of the patterns and bulges on theβ-Ga2O3surface after annealing.The feasibility of the carrier modulation technology enables the diversity ofβ-Ga2O3devices fabrication. 展开更多
关键词 Ga2O3 oxygen annealing carrier modulation power device
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