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Electrically tunable transmission characteristics in the type-I band based on grating graphene/h-BN heterostructures

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Optics Express 2025年第8期33卷 17136-17148页

作者： Cai, Ming Sun, Shangxuan Su, Han Lu, Min He, Xiaomin Lin, Tao Yang, Zhaonian Wang, Yindi Wang, Shulong School of Automation and Information Engineering Xi’an University of Technology Xi’an710048 China School of Electronic Information and Artificial Intelligence Shaanxi University of Science and Technology Xi’an710016 China Key Laboratory for Wide Band Gap Semiconductor Materials and Devices of Education School of Microelectronics Xidian University Xi’an710071 China

The graphene/h-BN heterostructures exhibit a unique plasmon-phonon polaritons coupling mode in the mid-IR frequency spectrum, with adjustable excitation intensity through external voltage. Such an innovation opens up avenues for designing low-power, subwavelength, and electrically tunable devices. A grating structure is introduced in this paper to overcome the constraints posed by previous probe-based methods for wavevector matching. The grating structure simplifies the experimental setup, enhancing the practicality and scalability of the heterostructures. Furthermore, an investigation is conducted into the optical properties and electrical tunability of the grating-integrated graphene/h-BN heterostructures. Numerical simulations and theoretical calculations reveal remarkable electrical tunability of optical transmission characteristics in the type-I band, especially at an incident frequency of 23.816 THz. As external voltage increases, the dispersion curve undergoes a noticeable red shift, reaching a maximum negative absorptivity of -207.36% at 5 V, with reflectivity decreasing to 4.60%. Electric field distribution maps indicate a substantial enhancement in electric field intensity within graphene/h-BN/graphene parts of the structure at 5 V, with the change in electric field direction primarily contributing to the negative absorption. Additionally, the transmittance spectrum confirms the effective modulation of 23.816 THz light transmissivity through adjustments in external voltage, with values of 22.14% at 4 V and 302.77% at 5 V, respectively. The findings provide a foundation for applying graphene/h-BN heterostructures in integrated photonic systems, light manipulation, optical sensing and other fields. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Light transmission

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Breakdown voltage over 10 kV β-Ga2O3 heterojunction FETs with RESURF structure

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Science China(Information Sciences) 2025年第06期 397-398页

作者： Chenlu WANG Sihan SUN Chunxu SU Hong ZHOU Jincheng ZHANG Yue HAO State Key Laboratory of Wide-Bandgap Semiconductor Devices and Integrated Technology School of MicroelectronicsXidian University Guangzhou Wide Bandgap Semiconductor Innovation Center Guangzhou Institute of TechnologyXidian University

β-Ga2O3has sparked a new wave of enthusiasm in the power community because of high-voltage and high-efficiency application demands, which is attributed to its superior ultrawide bandgap of 4.9 eV, theoretical critica...

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Mid-infrared period doubled solitons in a few-mode fluoride fiber oscillator

Mid-infrared period doubled solitons in a few-mode fluoride ...

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2024 Advanced Fiber Laser Conference, AFL 2024

作者： Yang, Ying Ma, Shuanglong Chen, Zifeng Luo, Xing Guo, Chunyu Ruan, Shuangchen Shenzhen Key Laboratory of Laser Engineering Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province State Key Laboratory of Radio Frequency Heterogeneous Integration College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China Key Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education Institutes Shenzhen Technology University Shenzhen518118 China

ISBN: (数字)9781510688889

ISBN: (纸本)9781510688872

Period doubling bifurcation (PDB) phenomenon, which is prevalent in nonlinear systems, has attracted considerable attention because of its potential application value. As an ideal platform for studying the pulse dynamics of nonlinear systems, the mode-locked fiber laser has been intensively investigated in the near-infrared (NIR) spectral region. However, there is a paucity of relevant reports of pulse dynamics in the mid-infrared (MIR) spectral region. Especially for the MIR large-mode-area (LMA) fluoride fiber oscillator, the existence of multiple transverse modes and a new spatial degree of freedom makes the pulse dynamics phenomenon is more complex, which needs to be further explored. In this paper, a soliton regime with a pulse duration of 404.5 fs, repetition frequency of 45.02 MHz, and average output power of 105.3 mW is obtained in a few-mode fluoride fiber oscillator mode-locked by the nonlinear polarization rotation (NPR) technique. By merely increasing the power of the pump, a period doubled soliton with the pulse intensity varying between two different values can be obtained. This work facilitates a more profound comprehension of the nonlinear dynamics in the mid-infrared multimode fluoride fiber laser, and opens up new opportunities for the chaos, optical frequency combs and all-optical modulation. © 2025 SPIE.

关键词： Infrared devices

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AQ-band spatial power combining module based on antipodal finline transitions 2

AQ-band spatial power combining module based on antipodal fi...

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2nd International Workshop on Engineering Physics, IWEP 2024

作者： Chen, Xilong Wang, Wei Zhang, Li Yang, Songyuan Lin, Qinglei College of Physics and Electronic Information Yunnan Normal University Kunming650500 China Yunnan Key Laboratory of Opto-electronic Technology Kunming650500 China State Key Laboratory of Wide Bandgap Semiconductor Devices and Integrated Technology School of Microelectronics Xidian University Xi'an710071 China

In this paper, a Q-band spatial power combining module based on antipodal finline transition is designed, which combines the excellent characteristics of antipodal finline and the advantages of spatial power combining technology (SPCT) in millimeter-wave band. Numeric simulation shows a return loss better than 14.9dB and an average insertion loss of 1.19dB between 39.5 - 47.5GHz, and the theoretical average power combined efficiency can reach up to 87.3%. The measurement results reveal an average power combined efficiency of 72.8% and the maximum power combined efficiency of 80.4%. © 2025 Institute of Physics Publishing. All rights reserved.

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A novel active-passive protection strategy endows carbonyl iron with excellent intelligent anti-corrosion and microwave absorption dual functional characteristics

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Nano Research 2025年第1期18卷 487-500页

作者： Wei Tian Quanyuan Feng Linbo Zhang Yinfan Liu Xian Jian Longjiang Deng Institute of Microelectronics School of Information Science and TechnologySouthwest Jiaotong UniversityChengdu 611756China National Engineering Researching Centre of Electromagnetic Radiation Control Materials Key Laboratory of Multi-Spectral Absorbing Materials and Structures of Ministry of EducationState Key Laboratory of Electronic Thin Films and Integrated DevicesSchool of Electronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu 611731China School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China The Yangtze Delta Region Institute(Huzhou)&School of Electronic Science and Engineering University of Electronic Science and Technology of ChinaHuzhou 313001China

Carbonyl iron absorbers(CI)face significant challenges in practical applications,such as corrosion,interface bonding failure,detachment,and high maintenance ***,we have developed intelligent self-healing technology based on proactive/passive mechanisms via in situ synthesis of self-healing factors(polydopamine/benzotriazole(PDA/BTA))and physical barrier layers(SiO_(2)/1,1,1,3,3,3-hexamethyl disilazane,SiO_(2)/HMDS)to enhance corrosion resistance,while also being compatible with efficient microwave absorption *** unique multiscale structure gives full play to the utilization of the roles of each functional layer,including the intelligent self-healing features of PDA/BTA,physical shielding and spatial confinement characteristics of SiO_(2)/HMDS,and magnetic-dielectric synergistic mechanism resulted from the good impedance matching characteristics,the conduction loss,the interfacial polarization loss and natural *** asfabricated composites achieved an exceptional minimum reflection loss value of-55.4 dB at 10.7 GHz and the effective absorption band of 7.6 ***,it still exhibits obvious self-healing and corrosion resistance characteristics after 360 h corrosion treatment,ascribed to the self-healing mechanism of PDA/BTA and the blocking intervention effect of SiO_(2)/*** work is considered to pave the way for the synthesis of high-performance magnetic absorbers,especially in enhancing their intelligent self-healing ability in corrosive environments.

关键词： microwave absorption intelligent self-healing technology carbonyl iron multiscale structure magneticdielectric synergistic mechanism

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Innovative dual-mode device integrating capacitive desalination and solar vapor generation for high-efficiency seawater desalination

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Journal of Energy Chemistry 2025年第1期100卷 171-179页

作者： Jiacheng Wang Zhaoyu Chen Ruduan Yuan Jiaxin Luo Ben Zhang Keju Ji Meng Li Juanxiu Xiao Kuan Sun National Innovation Center for Industry-Education Integration of Energy Storage Technology MOE Key Laboratory of Low-grade Energy Utilization Technologies and SystemsCollege of Energy&Power EngineeringChongqing UniversityChongqing 400044China Xuefeng Mountain Energy Equipment Safety National Observation and Research Station CQU-NUS Renewable Energy Materials&Devices Joint LaboratoryChongqing UniversityChongqing 400044China Southwest Technology and Engineering Research Institute Chongqing 400039China Jiangsu Provincial Key Laboratory of Bionic Functional Materials College of Mechanical and Electrical EngineeringNanjing University of Aeronautics and AstronauticsNanjing 210016JiangsuChina State Key Laboratory of Marine Resources Utilization in South China Sea Collaborative Innovation Center of Marine Science and TechnologySchool of Marine Science and EngineeringHainan UniversityHaikou 570228HainanChina

Solar-driven interface evaporation with high solar-to-steam conversion efficiency has shown great potential in seawater ***,due to the influence of latent heat and condensation efficiency,the water yield from solar-driven interface evaporation remains insufficient,posing a significant challenge that requires *** this work,we designed a dual-mode high-flux seawater desalination device that combines solar-driven interface evaporation and capacitive *** utilizing coupled desalination materials exhibiting both photothermal conversion and capacitance activity,the device demonstrated photothermal evaporation rates of 1.41 and 0.97 kg m^(-2)h^(-1)for condensate water yield under one-sun ***,the device exhibited a salt adsorption capacity of up to48 mg g^(-1)and a salt adsorption rate of 2.1 mg g^(-1)*** addition,the salt adsorption capacity increased by approximately 32%under one-sun ***,photo-enhanced capacitive desalination performance was explored through numerical simulations and theoretical *** calculations and characterizations confirmed that the defect energy levels formed by the introduction of sulfur vacancies can effectively widen the light absorption range,improve photothermal conversion performance,and stimulate more photoelectrons to participate in capacitive ***,the electron distribution state of molybdenum disulfide with sulfur vacancies and surface defect sites contributes to ion/electron transport at the solid-liquid *** work provides a novel pathway for integrating solar vapor generation with other low-energy desalination technologies.

关键词： Capacitive deionization Solar vapor generation Molybdenum disulfide Defect engineering

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Electromagnetic Functions Modulation of Recycled By-Products by Heterodimensional Structure

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Nano-Micro Letters 2025年第6期17卷 264-278页

作者： Ze Nan Wei Wei Zhenhua Lin Ruimei Yuan Miao Zhang Jincheng Zhang Jianyong Ouyang Jingjing Chang Hejun Li Yue Hao State Key Laboratory of Wide-Bandgap Semiconductor Devices and Integrated Technology School of MicroelectronicsXidian UniversityXi’an 710071People’s Republic of China State Key Laboratory of Solidification Processing Shaanxi Province Key Laboratory of Fiber Reinforced Light Composite MaterialsCarbon/Carbon Composites Research CenterNorthwestern Polytechnical UniversityXi’an 710072People’s Republic of China Advanced Interdisciplinary Research Center for Flexible Electronics Xidian UniversityXi’an 710071People’s Republic of China Department of Materials Science and Engineering National University of Singapore7 Engineering Drive 1Singapore 117574Singapore

One of the significant technological challenges in safeguarding electronic devices pertains to the modulation of electromagnetic(EM)wave jamming and the recycling of defensive *** synergistic effect of heterodimensional materials can effectively enable the manipulation of EM waves by altering the *** we propose a novel approach for upcycling by-products of silver nanowires that can fabricate shape-tunable aerogels which enable the modulation of its interaction with microwaves by heterodimensional structure of ***-product heterodimensionality was used to design EM-wave-jamming-dissipation structures and therefore two typical tunable aerogel forms were *** first tunable form was aerogel film,which shielded EM interference(EMI shielding effectiveness(EMI SE)>89 dB)and the second tunable form was foam,which performed dual EM functions(SE>30 dB&reflective loss(RL)<-35 dB,effective absorption bandwidth(EAB)>6.7 GHz).We show that secondary recycled aerogels retain nearly all of their EM protection properties,making this type of closed-loop cycle an appealing *** findings pave the way for the development of adaptive EM functions with nanoscale regulation in a green and closed-loop cycle,and they shed light on the fundamental understanding of microwave interactions with heterodimensional structures.

关键词： Silver nanowires Electromagnetic shielding Microwave absorption Recycled aerogels

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Understanding the role of dislocation defects of GaN HEMT under short-circuit stress through transient thermal characterization

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IEEE Transactions on Power Electronics 2025年第8期40卷 11314-11325页

作者： Jiang, Xi Wu, Yue Yuan, Song Li, Xiangdong Yan, Zhaoheng Chen, Jing Jiang, Tao Zhang, Shijie Gong, Xiaowu Niu, Hao Wang, Jun Guangzhou Institute of Technology Xidian University Guangzhou510555 China Key Laboratory of Wide Bandgap Semiconductor Materials and Devices School of Microelectronics Xidian University Xi’an710071 China Fifth Electronics Research Institute of the Ministry of Industry and Information Technology Guangzhou510610 China College of Electrical and Information Engineering Hunan University Changsha410082 China

GaN HEMT devices are prone to rapid failure after repetitive short-circuit (SC) stress under high bus voltage conditions. The dislocation defects at the substrate interface play a critical role in inducing device degradation and thermal breakdown failure. However, the mechanisms of dislocation defect formation under SC stress and their influence on the SC capability of GaN HEMTs remain unclear. This paper presents a novel method based on transient thermal resistance characterization to monitor the evolution of dislocation defects within GaN HEMT devices. Meanwhile, a thermal model is developed to illustrate the influence of dislocation defects on the thermal characteristics of the device. By analyzing the structure function of the GaN HEMT before and after SC stress, the accumulation of previously imperceptible defects is translated into observable changes in thermal resistance curves. The degradation of thermal characteristics of GaN HEMT devices under varying bus voltages and SC pulse durations are investigated. Experimental results demonstrate that the transient thermal characterization method effectively identifies regions of dislocation defect accumulation, quantifies the extent of defect accumulation, and provides a comprehensive understanding of damage evolution within GaN HEMTs under repetitive SC stress. © 1986-2012 IEEE.

关键词： Gallium nitride

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F3: An FPGA-based Transformer Fine-tuning Accelerator with Flexible Floating Point Format

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IEEE Journal on Emerging and Selected Topics in Circuits and Systems 2025年

作者： He, Zerong Liu, Jing Jin, Xi Xu, Zhongguang Chinese Academy of Sciences Key Laboratory of Microelectronic Devices and Integration Technology Institute of Microelectronics Beijing100029 China University of Science and Technology of China School of Physical Science Anhui Hefei230022 China University of Science and Technology of China School of Microelectronics Anhui Hefei230026 China

Transformers have demonstrated remarkable success across various deep learning tasks. However, their inference and fine-tuning require substantial computation and memory resources, posing challenges for existing hardware platforms, particularly resource-constrained edge devices. To address these limitations, we propose F3, an FPGA-based accelerator for transformer fine-tuning. To reduce computation and memory overhead, this paper proposes a flexible floating point (FFP) format which consumes fewer resources than traditional floating-point formats of the same bitwidth. We adapt low-rank adaptation to FFP format and propose a fine-tuning strategy named LR-FFP which reduces the number of trainable parameters without compromising fine-tuning accuracy. At the hardware level, we design specialized processing elements (PEs) for the FFP format. The PE maximizes the utilization of DSP resources, enabling a single DSP to perform two multiply-accumulate operations per cycle. The PEs are organized into a systolic array (SA) to efficiently handle general matrix multiplication during fine-tuning. Through theoretical analysis and experimental evaluation, we determine the optimal dataflow and SA parameters to balance performance and resource consumption. We implement the architecture on the Xilinx VCU128 FPGA platform and F3 achieves a performance of 8.2 TFlops at 250 MHz. Compared with CPU and GPU implementations, F3 achieves speedups of 15.22× and 3.44×, respectively, and energy efficiency improvements of 70.52× and 9.44×. © 2011 IEEE.

关键词： Systolic arrays

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Kilowatt level high-power thulium doped fiber laser

Kilowatt level high-power thulium doped fiber laser

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2024 Advanced Fiber Laser Conference, AFL 2024

作者： Zhang, Xiao Dong, Fanlong Yan, Peiguang Wang, Jinzhang Lue, Qitao Guo, Chunyu Ruan, Shuangchen Shenzhen Key Laboratory of Laser Engineering Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province State Key Laboratory of Radio Frequency Heterogeneous Integration College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China Key Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education Institutes Shenzhen Technology University Shenzhen518118 China Han’s Laser Technology Industry Group Co. Ltd. Shenzhen518057 China

ISBN: (数字)9781510688889

ISBN: (纸本)9781510688872

In this paper, a high power Tm3+-doped fiber laser (TDFL) based on a monolithic master oscillator power amplifier (MOPA) system with the center wavelength is 1940 nm is *** maximum laser power was measured to be 909 W with a slope efficiency of 50.1% at the 793 nm pump power of 1816 W. Power stability of the laser output over 60 min is measured to be ~0.14% .Output power is pump-limited without the onset of parasitic oscillation or amplified spontaneous emission (ASE) even at the maximum power, showing further power scaling should be possible with increase the pump power. © 2025 SPIE.

关键词： Optical pumping

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