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Breaking the bandwidth-efficiency trade-off in modified uni-travelling-carrier photodiodes 认领 引用
1
作者 Yijun Guo Xingjun Wang 《Journal of Semiconductors》 EI CAS CSCD 2026年第7期37-40,共4页
As emerging real-time services like telemedicine,autonomous driving and virtual reality drive an explosive growth in wireless communication traffic[1], traditional microwave frequency bands have become saturated, push... As emerging real-time services like telemedicine,autonomous driving and virtual reality drive an explosive growth in wireless communication traffic[1], traditional microwave frequency bands have become saturated, pushing the industry towards the sub-THz spectrum for ultrafast data transfer[2]. Photonic-assisted sub-THz technologies have emerged as the compelling solution for this shift, owing to their broad bandwidth, tunability and intrinsic stability[3, 4]. 展开更多
关键词 bandwidth efficiency virtual reality telemedicine autonomous driving sub thz spectrum telemedicineautonomous driving wireless communication photonic assisted technologies
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Co-packaged optics:enabling the next generation high-bandwidth and energy-efficient interconnects 认领 引用
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作者 Linjie Zhou Xianshu Luo 《Advanced Photonics Nexus》 CSCD 2026年第3期1-2,共2页
The exponential growth of artificial intelligence(AI),large language models,and hyperscale data centers is rapidly reshaping the requirements for data communication infrastructure.As electrical interconnects approach ... The exponential growth of artificial intelligence(AI),large language models,and hyperscale data centers is rapidly reshaping the requirements for data communication infrastructure.As electrical interconnects approach their fundamental limits in bandwidth density and energy efficiency,co-packaged optics(CPO)has emerged as a compelling paradigm to overcome these bottlenecks.By integrating photonic engines in close proximity to application-specific integrated circuits(ASICs),CPO minimizes electrical link lengths,reduces power consumption,and enables unprecedented bandwidth scaling.At the same time,this tight integration introduces new challenges spanning materials,device design,packaging,thermal management,and system architecture. 展开更多
关键词 high bandwidth electrical interconnects co packaged optics hyperscale data centers overcome bottlenecksby artificial intelligence ai large language modelsand data communication infrastructureas photonic engines
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Quantized cooperative salvo guidance under limited bandwidth with time-varying directed topology 认领 引用
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作者 Peisheng WANG Chaoyang DONG +2 位作者 Xiaohui LIANG Xuehu MA Shen ZHANG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第3期480-498,共19页
This study presents the development and evaluation of a quantized cooperative salvo guidance law designed to achieve simultaneous attacks on stationary targets under communication bandwidth constraints.A novel joint d... This study presents the development and evaluation of a quantized cooperative salvo guidance law designed to achieve simultaneous attacks on stationary targets under communication bandwidth constraints.A novel joint design methodology for encoders,decoders,and guidance laws is proposed,effectively overcoming cooperative guidance challenges in time-varying directed topology with limited bandwidth.This approach identifies the minimum bandwidth requirements for executing salvo attacks and provides valuable insights into the trade-offs between communication resource allocation and operational effectiveness.The method is systematically extended to two-dimensional cooperative guidance in fixed directed topology and further adapted to threedimensional cooperative guidance in time-varying directed topology,demonstrating its adaptability and scalability across different dimensions and network dynamics.Extensive simulations conducted in diverse operational scenarios validate the proposed guidance laws,showcasing their robust performance and practical feasibility. 展开更多
关键词 Cooperative guidance Salvo attack Bandwidth Time-varying topology Impact Time Control Guidance(ITCG)
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Performance Analysis of Bandwidth Aware Hybrid Powered 5G Cloud Radio Access Network 认领 引用
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作者 Md.Al-Hasan Mst.Rubina Aktar +3 位作者 Fahmid Al Farid Md.Shamim Anower Abu Saleh Musa Miah Md.Hezerul Abdul Karim 《Computers, Materials & Continua》 SCIE EI 2026年第4期2146-2160,共15页
The rapid growth in available network bandwidth has directly contributed to an exponential increase in mobile data traffic,creating significant challenges for network energy consumption.Also,with the extraordinary gro... The rapid growth in available network bandwidth has directly contributed to an exponential increase in mobile data traffic,creating significant challenges for network energy consumption.Also,with the extraordinary growth of mobile communications,the data traffic has dramatically expanded,which has led to massive grid power consumption and incurred high operating expenditure(OPEX).However,the majority of current network designs struggle to efficientlymanage a massive amount of data using little power,which degrades energy efficiency performance.Thereby,it is necessary to have an efficient mechanism to reduce power consumption when processing large amounts of data in network data centers.Utilizing renewable energy sources to power the Cloud Radio Access Network(C-RAN)greatly reduces the need to purchase energy from the utility grid.In this paper,we propose a bandwidth-aware hybrid energypowered C-RAN that focuses on throughput and energy efficiency(EE)by lowering grid usage,aiming to enhance the EE.This paper examines the energy efficiency,spectral efficiency(SE),and average on-grid energy consumption,dealing with the major challenges of the temporal and spatial nature of traffic and renewable energy generation across various network setups.To assess the effectiveness of the suggested network by changing the transmission bandwidth,a comprehensive simulation has been conducted.The numerical findings support the efficacy of the suggested approach. 展开更多
关键词 5G bandwidth renewable energy energy efficiency spectral efficiency C-RAN
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Correction:Initiating Binary Metal Oxides Microcubes Electromagnetic Wave Absorber Toward Ultrabroad Absorption Bandwidth Through Interfacial and Defects Modulation 认领 引用
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作者 Fushan Li Nannan Wu +8 位作者 Hideo Kimura Yuan Wang Ben Bin Xu Ding Wang Yifan Li Hassan Algadi Zhanhu Guo Wei Du Chuanxin Hou 《Nano-Micro Letters》 SCIE EI CAS CSCD 2025年第11期530-533,共4页
Following publication of the original article[1],the authors found that they pasted the same data when drawing XRD for sample NCO-1 and NCO-2 in Fig.2a,however,the XRD of all four samples in the manuscript was tested,... Following publication of the original article[1],the authors found that they pasted the same data when drawing XRD for sample NCO-1 and NCO-2 in Fig.2a,however,the XRD of all four samples in the manuscript was tested,and XRD raw data were kept and can be offered.The correct Fig.2 has been provided in this Correction. 展开更多
关键词 binary metal oxides ultrabroad absorption bandwidth electromagnetic wave absorber interfacial modulation defects modulation xrd microcubes
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Pulse duration tunable ultra-narrow bandwidth mode-locked lasers 认领 引用
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作者 Weixi Li Lilong Dai +8 位作者 Qianqian Huang Meng Zou Xiangpeng Xiao Siyu Luo Siyu Chen Yingxiong Song Yunqi Liu Zhijun Yan Chengbo Mou 《Advanced Photonics Nexus》 CSCD 2025年第3期168-175,共8页
Ultra-narrow bandwidth mode-locked lasers with tunable pulse duration can be versatile light sources for diverse applications.However,the spectral-temporal control of a narrow bandwidth mode-locked laser is challengin... Ultra-narrow bandwidth mode-locked lasers with tunable pulse duration can be versatile light sources for diverse applications.However,the spectral-temporal control of a narrow bandwidth mode-locked laser is challenging due to limited gain and nonlinearity,hindering practical applications of such lasers.We demonstrate a pulse duration widely tunable mode-locked ultra-narrow bandwidth laser using a composite filtering mechanism and a single-wall carbon nanotube.The laser pulse duration can be adjusted from 481 ps to 1.38 ns,which is the widest tuning range achieved in narrow-bandwidth passively mode-locked lasers.When the pulse duration is 1.38 ns,the corresponding spectral width reaches 4 pm(502 MHz).Numerical simulations support the experimental results and show that the evolution of long pulses in the laser cavity behaves similarly to a quasi-continuous wave with a low breathing ratio.We have not only designed a simple and flexible tunable scheme for the dilemma of spectral-temporal control in narrow-bandwidth mode-locked fiber lasers but also provided a unique and idealized light source for various applications that takes into account robust output. 展开更多
关键词 mode-locked fiber laser ultra-narrow bandwidth nanosecond pulse single-walled carbon nanotube spectral-temporal control
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Equivalent Bandwidth Concept and Its Usage in the Network Selection 认领 引用
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作者 Ma Anhua Pan Su Zhou Weiwei 《China Communications》 SCIE EI CSCD 2025年第2期213-225,共13页
Maximize the resource utilization efficiency and guarantee the quality of service(QoS)of users by selecting the network are the key issues for heterogeneous network operators,but the resources occupied by users in dif... Maximize the resource utilization efficiency and guarantee the quality of service(QoS)of users by selecting the network are the key issues for heterogeneous network operators,but the resources occupied by users in different networks cannot be compared directly.This paper proposes a network selection algorithm for heterogeneous network.Firstly,the concept of equivalent bandwidth is proposed,through which the actual resources occupied by users with certain QoS requirements in different networks can be compared directly.Then the concept of network applicability is defined to express the abilities of networks to support different services.The proposed network selection algorithm first evaluates whether the network has enough equivalent bandwidth required by the user and then prioritizes network with poor applicability to avoid the situation that there are still residual resources in entire network,but advanced services can not be admitted.The simulation results show that the proposed algorithm obtained better performance than the baselines in terms of reducing call blocking probability and improving network resource utilization efficiency. 展开更多
关键词 call blocking probability equivalent bandwidth heterogeneous network network applicability
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Hollow engineering in CoNi@Air@C@MoS2 multicomponent composites derived from bimetallic CoNi Prussian blue analogs for ultra-wide bandwidth and strong electromagnetic wave absorption 认领 引用 被引量：3
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作者 Ziqing Yang Qiqin Liang +8 位作者 Xiaosi Qi Beibei Zhan Xiu Gong Yunpeng Qu Junfei Ding Jing-Liang Yang Yanli Chen Qiong Peng Wei Zhong 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第9期35-43,共9页
In recent years,two-dimensional layered transition metal dichalcogenides-based multicomponent com-posites(MCCs)acting as electromagnetic wave(EMW)materials have received intensive investiga-tions.However,the vulcanica... In recent years,two-dimensional layered transition metal dichalcogenides-based multicomponent com-posites(MCCs)acting as electromagnetic wave(EMW)materials have received intensive investiga-tions.However,the vulcanication of metal greatly hindered their enhancement of EMW absorption per-formances(EMWAPs).Herein,a combined metal-organic frameworks-derived and hydrothermal strat-egy was presented to produce yolk-shell structure(YSS)CoNi@Air@C@MoS2 MCCs.The results showed that the thermal and hydrothermal treatments resulted in the generation of YSS and two-dimensional MoS2 nanosheets,which maintained the original morphology of CoNi Prussian blue analogues.The pro-tection of thick C layer well inhibited the vulcanization of inner CoNi alloy.The formed sheet-like MoS2 further optimized impedance matching characteristics,which led to the satisfactory EMWAPs of CoNi@Air@C@MoS2 MCCs.Furthermore,the EMWAPs could be further improved by optimizing the Ni:Co atom ratios CoNi@Air@C@MoS2 MCCs,which stemmed from their boosted impedance matching perfor-mances,EMW attention and polarization loss abilities.The absorption bandwidth and reflection loss val-ues for YSS CoNi@Air@C@MoS2 MCCs are 8 GHz and−60.83 dB,which covered almost all C-Ku bands.In general,our research work provided a valid strategy to produce YSS magnetic CoNi@Air@C@MoS2 MCCs with high efficiency,which well avoided the vulcanization of metal nanoparticles,made best of hollow engineering and atomic ratio optimization strategy to boost the comprehensive EMWAPs. 展开更多
关键词 Hollow engineering CoNi@Air@C@MoS2 Polarization loss Ultra-wide bandwidth Microwave absorption
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On the stability condition of active disturbance rejection control with time-varying bandwidth observer 认领 引用 被引量：1
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作者 Depeng Song Sen Chen +1 位作者 Wenchao Xue Zhiliang Zhao 《Control Theory and Technology》 EI CSCD 2025年第3期464-478,共15页
With the growing adoption of artificial intelligence algorithms and neural networks,online learning and adaptive methods for updating the bandwidth have become increasingly prevalent.However,the conditions required to... With the growing adoption of artificial intelligence algorithms and neural networks,online learning and adaptive methods for updating the bandwidth have become increasingly prevalent.However,the conditions required to ensure closed-loop stability when employing a time-varying bandwidth,as well as the supporting mathematical foundations,remain insufficiently studied.This paper investigates the stability condition for active disturbance rejection control(ADRC)with a time-varying bandwidth extended state observer(ESO).A new stability condition is derived,which means that the upper bound of rate of change for ESO bandwidth should be restricted.Moreover,under the proposed condition,the closed-loop stability of ADRC with a time-varying bandwidth observer is rigorously proved for nonlinear uncertainties.In simulations,the necessity of the proposed condition is illustrated,demonstrating that the rate of change of ESO bandwidth is crucial for closed-loop stability. 展开更多
关键词 Active disturbance rejection control Time-varying bandwidth Extended state observer Closed-loop stability Rate of change
Unified Bandwidth Scheduling in Centralized Fixed Access Network(C-FAN) 认领 引用
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作者 Li Jun Lu Xiang +3 位作者 Wang Xiang Chang Tianghai Sanjay Kumar Bose Shen Gangxiang 《China Communications》 SCIE EI CSCD 2025年第1期196-215,共20页
Time Division Multiplexing-Passive Optical Networks(TDM-PONs)play a vital role in Fiberto-the-Home(FTTH)deployments.To improve the service quality of home networks,FTTH is expanding to the Fiber-to-the-Room(FTTR)scena... Time Division Multiplexing-Passive Optical Networks(TDM-PONs)play a vital role in Fiberto-the-Home(FTTH)deployments.To improve the service quality of home networks,FTTH is expanding to the Fiber-to-the-Room(FTTR)scenario,where fibers are deployed to connect individual rooms(i.e.,Fiber In-premises Network(FIN)in the ITU-T G.9940 standard).In this scenario,a point-to-multipoint(P2MP)fiber network is deployed as FTTR FIN to offer gigabit access to each room,which forms a two-tier cascaded network together with the FTTH segment.To optimize the capacity utilization of the cascaded network and reduce the overall system cost,a centralized architecture,known as Centralized Fixed Access Network(C-FAN),has been introduced.C-FAN centralizes the medium access control(MAC)modules of both the FTTH and FTTR networks at the FTTH’s Optical Line Terminal(OLT)for unified control and management of the cascaded network.We develop a unified bandwidth scheduling protocol by extending the ITU-T PON standard for both the upstream and downstream directions of C-FAN.We also propose a unified dynamic bandwidth allocation(UDBA)algorithm for efficient bandwidth allocation for multiple traffic flows in the two-tier cascaded network.Simulations are conducted to evaluate the performance of the proposed control protocol and the UDBA algorithm.The results show that,in comparison to the conventional DBA algorithm,the UDBA algorithm can utilize upstream bandwidth more efficiently to reduce packet delay and loss,without adversely impacting downstream transmission performance. 展开更多
关键词 architecture dynamic bandwidth allocation FTTH FTTR PON
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Tunable working bandwidth terahertz switch based on magnetic valley photonic crystal 认领 引用
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作者 Mingxia Hou Hongming Fei +1 位作者 Han Lin Mingda Zhang 《Chinese Physics B》 SCIE EI CAS CSCD 2025年第5期627-634,共8页
Terahertz(THz)switches are essential components of THz communication systems.THz switches based on conventional waveguides and photonic crystal structures are sensitive to manufacturing defects and sharp bending,resul... Terahertz(THz)switches are essential components of THz communication systems.THz switches based on conventional waveguides and photonic crystal structures are sensitive to manufacturing defects and sharp bending,resulting in high scattering losses.In addition,THz switches with tunable working bandwidths have not yet been demonstrated.Here,we design THz switches based on a topological valley photonic crystal(VPC)structure using magnetic materials,which can achieve high forward transmittance based on the unique spin–valley locking effect.The broad working bandwidth allows selective turning on and off at a designed wavelength region by controlling the applied magnetic field.The designed THz switch can achieve an extinction ratio of up to 31.66 dB with an insertion loss of less than 0.13 dB.The 3-dB bandwidth is up to 49 GHz.This tunable THz switch can be experimentally fabricated by current fabrication techniques and thus can find broad applications in THz communication systems. 展开更多
关键词 terahertz switch magnetic material valley photonic crystal tunable bandwidth
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Enhancing Bandwidth Allocation Efficiency in 5G Networks with Artificial Intelligence 认领 引用
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作者 Sarmad K.Ibrahim Saif A.Abdulhussien +1 位作者 Hazim M.ALkargole Hassan H.Qasim 《Computers, Materials & Continua》 SCIE EI 2025年第9期5223-5238,共16页
The explosive growth of data traffic and heterogeneous service requirements of 5G networks—covering Enhanced Mobile Broadband(eMBB),Ultra-Reliable Low Latency Communication(URLLC),and Massive Machine Type Communicati... The explosive growth of data traffic and heterogeneous service requirements of 5G networks—covering Enhanced Mobile Broadband(eMBB),Ultra-Reliable Low Latency Communication(URLLC),and Massive Machine Type Communication(mMTC)—present tremendous challenges to conventional methods of bandwidth allocation.A new deep reinforcement learning-based(DRL-based)bandwidth allocation system for real-time,dynamic management of 5G radio access networks is proposed in this paper.Unlike rule-based and static strategies,the proposed system dynamically updates itself according to shifting network conditions such as traffic load and channel conditions to maximize the achievable throughput,fairness,and compliance with QoS requirements.By using extensive simulations mimicking real-world 5G scenarios,the proposed DRL model outperforms current baselines like Long Short-Term Memory(LSTM),linear regression,round-robin,and greedy algorithms.It attains 90%–95%of the maximum theoretical achievable throughput and nearly twice the conventional equal allocation.It is also shown to react well under delay and reliability constraints,outperforming round-robin(hindered by excessive delay and packet loss)and proving to be more efficient than greedy approaches.In conclusion,the efficiency of DRL in optimizing the allocation of bandwidth is highlighted,and its potential to realize self-optimizing,Artificial Intelligence-assisted(AI-assisted)resource management in 5G as well as upcoming 6G networks is revealed. 展开更多
关键词 5G bandwidth allocation DRL for 5G AI-based resource management QoS optimization for 5G networks dynamic spectrum allocation SON
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An Adaptive Bandwidth Allocation for Energy Efficient Wireless Communication Systems 认领 引用
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作者 Yung-Fa Huang Che-Hao Li +1 位作者 Chuan-Bi Lin Chia-Chi Chang 《Journal of Electronic Science and Technology》 EI CAS CSCD 2015年第1期27-32,共6页
In this paper, an energy efficient bandwidth allocation scheme is proposed for wireless communication systems. An optimal bandwidth expansion（OBE） scheme is proposed to assign the available system bandwidth for user... In this paper, an energy efficient bandwidth allocation scheme is proposed for wireless communication systems. An optimal bandwidth expansion（OBE） scheme is proposed to assign the available system bandwidth for users. When the system bandwidth does not reach the full load, the remaining bandwidth can be energy-efficiently assigned to the other users. Simulation results show that the energy efficiency of the proposed OBE scheme outperforms the traditional same bandwidth expansion（SBE） scheme. Thus, the proposed OBE can effectively assign the system bandwidth and improve energy efficiency. 展开更多
关键词 Bandwidth resource allocation energy efficiency optimal bandwidth expansion same bandwidth expansion
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Analysis of restriction factors of widening diffraction bandwidth of multilayer dielectric grating 认领 引用
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作者 汪剑鹏 晋云霞 +2 位作者 麻健勇 邵建达 范正修 《Chinese Physics B》 SCIE EI CAS 2010年第10期265-272,共8页
In order to design a multilayer dielectric grating with wide-bandwidth diffraction spectrum, the restriction factors of both the reflection bandwidth of multilayer dielectric high-reflectivity mirror and the guided-mo... In order to design a multilayer dielectric grating with wide-bandwidth diffraction spectrum, the restriction factors of both the reflection bandwidth of multilayer dielectric high-reflectivity mirror and the guided-mode resonance phe- nomenon are studied in detail. The reflection characteristics of high-reflectivity mirror in zeroth and -lst transmitted diffraction orders are quantitatively evaluated. It is found that the reflection bandwidth of high-reflectivity mirror in -lst transmitted diffraction order, which determines the final diffraction bandwidth of multilayer dielectric grating, is evidently compressed. Furthermore, it is demonstrated that the reducing of grating period is an effective approach to the elimination of guided mode resonance over a required broad band range both spectrally and angularly. In addition, the expressions for calculating the maximum period ensuring no guided mode resonance in the required bandwidth are derived. Finally, two high-efficiency pulse-compression gratings with broad-band are presented. 展开更多
关键词 multilayer dielectric grating broad band diffraction bandwidth reflection bandwidth,guided-mode resonance
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Novel Method of Predicting Network Bandwidth Based on Support Vector Machines 认领 引用
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作者 沈伟 冯瑞 邵惠鹤 《Journal of Beijing Institute of Technology》 EI CAS 2004年第4期454-457,共4页
In order to solve the problems of small sample over-fitting and local minima when neural networks learn online, a novel method of predicting network bandwidth based on support vector machines(SVM) is proposed. The pre... In order to solve the problems of small sample over-fitting and local minima when neural networks learn online, a novel method of predicting network bandwidth based on support vector machines(SVM) is proposed. The prediction and learning online will be completed by the proposed moving window learning algorithm(MWLA). The simulation research is done to validate the proposed method, which is compared with the method based on neural networks. 展开更多
关键词 support vector machines(SVM) neural networks network bandwidth bandwidth prediction
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JOINT RESOURCE ALLOCATION FOR WLAN&WCDMA INTEGRATED NETWORKS BASED ON SPECTRAL BANDWIDTH MAPPING 认领 引用
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作者 Pan Su Ye Qiang +1 位作者 Liu Shengmei Zhou Dawei 《Journal of Electronics(China)》 2011年第4期474-482,共9页
Next wireless network aims to integrate heterogeneous wireless access networks by sharing wireless resource.The spectral bandwidth mapping concept is proposed to uniformly describe the resource in heterogeneous wirele... Next wireless network aims to integrate heterogeneous wireless access networks by sharing wireless resource.The spectral bandwidth mapping concept is proposed to uniformly describe the resource in heterogeneous wireless networks.The resources of codes and power levels in WCDMA system as well as statistical time slots in WLAN are mapped into equivalent bandwidth which can be allocated in different networks and layers.The equivalent bandwidth is jointly distributed in call admission and vertical handoff control process in an integrated WLAN/WCDMA system to optimize the network utility and guarantee the heterogeneous QoS required by calls.Numerical results show that,when the incoming traffic is moderate,the proposed scheme could receive 5%-10% increase of system revenue compared to the MDP based algorithms. 展开更多
关键词 Equivalent bandwidth Spectral bandwidth mapping Heterogeneous networks Resource management
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Dynamic Bandwidth Allocation and Rate Coordination for DiffServ Environment 认领 引用 被引量：2
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作者 CHEN Gang WU Guo-xin +1 位作者 ZHANG San-feng YOU Feng-qin 《Wuhan University Journal of Natural Sciences》 EI CAS 2006年第1期248-252,共5页
This paper presents a novel model for dynamic bandwidth allocation and rate coordination based on DiffServ and a bandwidth broker(BB).In this model,assignment of bandwidth was made according to a periodic trace of net... This paper presents a novel model for dynamic bandwidth allocation and rate coordination based on DiffServ and a bandwidth broker(BB).In this model,assignment of bandwidth was made according to a periodic trace of network characteristics per application.And adjustment of transfer rate was accomplished through negotiation with applications by a bandwidth agent.This model was evaluated using network simulator 2(NS-2),and distinct improvements were found in respects of delay and packet loss of overall network and single flow.Finally,the model was suggested to be leveraged to multimedia applications with properties of lower delay and lower packet loss. 展开更多
关键词 QoS bandwidth broker(BB) dynamic bandwidth allocation rate coordination
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Achieving Ultra-Broad Microwave Absorption Bandwidth Around Millimeter-Wave Atmospheric Window Through an Intentional Manipulation on Multi-Magnetic Resonance Behavior 认领 引用 被引量：17
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作者 Chuyang Liu Lu Xu +6 位作者 Xueyu Xiang Yujing Zhang Li Zhou Bo Ouyang Fan Wu Dong‑Hyun Kim Guangbin Ji 《Nano-Micro Letters》 SCIE EI CAS CSCD 2024年第9期291-307,共17页
The utilization of electromagnetic waves is rapidly advancing into the millimeter-wave frequency range,posing increasingly severe challenges in terms of electromagnetic pollution prevention and radar stealth.However,e... The utilization of electromagnetic waves is rapidly advancing into the millimeter-wave frequency range,posing increasingly severe challenges in terms of electromagnetic pollution prevention and radar stealth.However,existing millimeter-wave absorbers are still inadequate in addressing these issues due to their monotonous magnetic resonance pattern.In this work,rare-earth La3+and non-magnetic Zr4+ions are simultaneously incorporated into M-type barium ferrite(BaM)to intentionally manipulate the multi-magnetic resonance behavior.By leveraging the contrary impact of La3+and Zr4+ions on magnetocrystalline anisotropy field,the restrictive relationship between intensity and frequency of the multi-magnetic resonance is successfully eliminated.The magnetic resonance peak-differentiating and imitating results confirm that significant multi-magnetic resonance phenomenon emerges around 35 GHz due to the reinforced exchange coupling effect between Fe3+and Fe2+ions.Additionally,Mosbauer spectra analysis,first-principle calculations,and least square fitting collectively identify that additional La3+doping leads to a profound rearrangement of Zr4+occupation and thus makes the portion of polarization/conduction loss increase gradually.As a consequence,the La3+-Zr4+co-doped BaM achieves an ultra-broad bandwidth of 12.5+GHz covering from 27.5 to 40+GHz,which holds remarkable potential for millimeter-wave absorbers around the atmospheric window of 35 GHz. 展开更多
关键词 Microwave absorption Ultra-broad bandwidth M-type barium ferrite Magnetocrystalline anisotropy field Multimagnetic resonance
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Two narrow bandwidth photons interfering in an electromagnetically induced transparency (EIT) system 认领 引用 被引量：12
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作者 王福源 史保森 +1 位作者 陆小松 郭光灿 《Chinese Physics B》 SCIE EI CAS 2008年第5期1798-1803,共6页
In this paper, we have analysed in detail the quantum interference of the degenerate narrowband two-photon state by using a Mach-Zehnder interferometer, in which an electromagnetically induced transparency （EIT） med... In this paper, we have analysed in detail the quantum interference of the degenerate narrowband two-photon state by using a Mach-Zehnder interferometer, in which an electromagnetically induced transparency （EIT） medium is placed in one of two interfering beams. Our results clearly show that it is possible to coherently keep the quantum state at a single photon level in the EIT process, especially when the transparent window of the EIT medium is much larger than the bandwidth of the single photon. This shows that the EIT medium is possibly a kind of memory or repeater for the narrowband photons in the areas of quantum communication and quantum computer. This kind of experiment is feasible within the current technology. 展开更多
关键词 EIT narrow bandwidth photons interference
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High efficiency and broad bandwidth grating coupler between nanophotonic waveguide and fibre 认领 引用 被引量：10
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作者 朱宇 徐学俊 +5 位作者 李智勇 周亮 韩伟华 樊中朝 俞育德 余金中 《Chinese Physics B》 SCIE EI CAS 2010年第1期393-397,共5页
A high efficiency and broad bandwidth grating coupler between a silicon-on-insulator （SOI） nanophotonic waveguide and fibre is designed and fabricated. Coupling efficiencies of 46% and 25% at a wavelength of 1.55um ... A high efficiency and broad bandwidth grating coupler between a silicon-on-insulator （SOI） nanophotonic waveguide and fibre is designed and fabricated. Coupling efficiencies of 46% and 25% at a wavelength of 1.55um are achieved by simulation and experiment, respectively. An optical 3 dB bandwidth of 45 mn from 1530 nm to 1575 nm is also obtained in experin, ent. Numerical calculation shows that a tolerance to fabrication error of 10 nm in etch depth is achievable. The measurement results indicate that the alignment error of 112 um results in less than 1 dB additional coupling loss. 展开更多
关键词 grating coupler silicon-on-insulator coupling efficiency bandwidth
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