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An Electrostatic Repulsive-Force Based Micro Actuator for Capacitive RF MEMS Switch

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An Electrostatic Repulsive-Force Based Micro Actuator for Ca...

IEEE International Conference on Nanotechnology

作者： Gang Li Xingjun Guo Qinghua Zhao Jie Hu Pengwei Li Wendong Zhang Chaoqun Cheng College of information engineering Taiyuan University of Technology Taiyuan China Key Lab of Advanced Transducers and Intelligent Control System (Ministry of Education) Taiyuan University of Technology Taiyuan China

ISBN: (纸本)9781467381574

A novel electrostatic repulsive force based micro actuator was firstly proposed to drive the capacitive radio frequency (RF) micro-electromechanical (MEMS) switch. The charging effects, which normally take place in the traditional electrostatic attractive force based MEMS switches, can be theoretically mitigated by using the proposed micro actuator, where no electric field will be produced across the dielectric when the proposed structure is actuated by the electrostatic repulsive force. The analytical models related to dielectric charging respectively derived from the electrostatic repulsive force and the electrostatic attractive force were analyzed and compared. In order to optimize the proposed micro actuator for further switch design, the formation mechanism and the operating principle of the electrostatic repulsive force was firstly analyzed, and then the relationships between displacement of movable electrode and the applied voltage were investigated by using the COMSOL Multiphysics software with the different micro actuator structures. The simulation results show that the maximum displacements of three new structures are bigger than the basic structure.

关键词： MEMS switch Charge accumulation Electrostatic repulsive force COMSOL

Tunable uniform field enhancement in a subwavelength air pillar by photonic doping in epsilon-near-zero medium

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arXiv 2024年

作者： Sun, Fei Shan, Jinyuan Liu, Yichao Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province College of Electronic Information and Optical Engineering Taiyuan University of Technology Taiyuan030024 China

In this study, a novel electric field compressor is proposed by doping a metal-air-metal pillar in epsilon-near-zero medium within a metallic waveguide, which effectively enhances the background electric fields in a sub-wavelength air pillar with high uniformity. The field enhancement factor can be analytically determined through theoretical derivations from Maxwell's equations, reaching its maximum value by appropriately selecting the size of the air pillar. Furthermore, the proposed compressor can achieve a tunable electric field enhancement effect within the deep sub-wavelength air pillar by adjusting the height of the air pillar through movement of two metal pillars inserted into the waveguide. Both theoretical analysis and numerical simulations are employed to validate the performance of the electric field compressor, which exhibits a wide range of tunable field enhancement effect (i.e., continuously adjustable enhancement factor between 20 and 800) with uniformity below 1.5 within the deep sub-wavelength air pillar (wherein the air volume is smaller than λ0/10 × λ0/10 × λ0/16). Finally, a practical model is proposed for the realization of the electric field compressor in the microwave range, where specially placed metal pillars and wires are incorporated into a rectangular metallic waveguide structure. The field enhancement and tunable effects of this practical model have been verified through simulations. Copyright © 2024, The Authors. All rights reserved.

关键词： Maxwell equations

Broadband planar electromagnetic hyper-lens with uniform magnification in air

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arXiv 2024年

作者： Sun, Ran Sun, Fei Chen, Hanchuan Liu, Yichao Wang, Qi Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province College of Electronic Information and Optical Engineering Taiyuan University of Technology Taiyuan030024 China

A planar hyper-lens, capable of creating sub-wavelength imaging for broadband electromagnetic wave, is designed based on electromagnetic null medium. Subsequently, a scheme for the implementation of the proposed hyper-lens is given by using well-designed flexural metal plates, which function as the reduced electromagnetic null medium for TM-polarized microwaves. Both simulated and measured results verify that the hyper-lens designed with flexural metal plates can achieve super-resolution imaging for microwave at operating wavelength (λ0=3cm) with a resolution of 0.25λ0 and a uniform magnification of about 5. Moreover, the designed hyper-lens ensures that both the object and image surfaces are planes, and simultaneously provides a uniform magnification for objects in different positions. Additionally, the proposed hyper-lens offers a broadband superresolution imaging capabilities, achieving good super-resolution imaging effects for microwave frequencies ranging from 8.5 to 11 GHz. The proposed hyper-lens may find applications in high precision imaging, detection, and sensing. Copyright © 2024, The Authors. All rights reserved.

关键词： Optical resolving power

Hals-770 Interlayer Simultaneously Block Internal and External Degradation Paths of Perovskite for Stability and High Efficiency Perovskite Solar Cells

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SSRN

SSRN 2024年

作者： Hu, Lina Zhang, Chenxi Wu, Yukun Li, Shiqi Ren, Jingkun Hao, Yang Sun, Qinjun Wang, Yulin Hao, Yuying College of Electronic Information and Optical Engineering Key Lab of Advanced Transducers and Intelligent Control System Taiyuan University of Technology Taiyuan030024 China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan030000 China

Here, we proposed a feasible solution using bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate (HALS-770) molecules as top protection layer of perovskite. The hindered amine groups of HALS-770 can form N-O· free radicals in oxygen environment and then react with superoxide (O2·-) to remove O2·- , hence improve the antioxidant ability of perovskite. Moreover, the water resistance of perovskite is improved by hydrophobic alkyl chains and hydrophilic groups adsorbing free water within perovskite, achieving double waterproof effect. HALS-770 not only suppress the external degradation path of perovskite but also block the channel of its internal degradation. The heterocyclic N atom and the carbonyl oxygen included in HALS-770 can coordinate with uncoordinated Pb2+ ions, block volatilization of organic cation and inhibit Ag+ and I- migration, thus improve thermal stability of perovskite and alleviate destruction of Ag electrode. As a result, the unencapsulated device maintains excellent stability over 95% of its initial efficiency after 30 days in ambient condition with about 25–50% humidity, and possesses remarkable continuous operation stability with projected T80 > 1400 h at maximum power point tracking in glove box, much higher than that the pristine device. Meanwhile, HALS-770 enable the achievement of efficiency of 21.89% , which is among the highest efficiencies for MAPbI3 based PSCs with p-i-n structure. Further, HALS-770 is used in FAMA-based devices with n-i-p structure, the efficiency of 23.03% and 20.73% are achieved for the devices with active area of 0.06 and 1.0 cm2, respectively. Also, HALS-770 devices show excellent stability. This work illustrates the key role of HALS-770 top interlayer in achieving high-performance photovoltaic devices. © 2024, The Authors. All rights reserved.

关键词： Perovskite

On-chip omnidirectional electromagnetic-thermal cloak

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arXiv 2023年

作者： Liu, Yichao Chen, Hanchuan Zhao, Gang Sun, Fei Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province College of Electronic Information and Optical Engineering Taiyuan University of Technology Taiyuan030024 China

Simultaneously guiding electromagnetic waves and heat flow at any incidence angle to smoothly bypass some electromagnetic/thermal sensitive elements is a key factor to ensure efficient communication and thermal protection for an on-chip system. In this study, an omnidirectional on-chip electromagnetic-thermal cloak is proposed. Firstly, a holey metallic plate with periodic array of subwavelength apertures is designed by optical surface transformation to realize an omnidirectional electromagnetic cloaking module for on-chip electromagnetic signal. Secondly, a two-layer ring-shaped engineered thermal structure is designed by solving Laplace equation to realize an omnidirectional thermal cloaking module for in-chip heat flow. Finally, these two cloaking modules are combined elaborately to achieve cloaking effect for both the electromagnetic waves and thermal fields simultaneously from any detecting direction, thus protecting the build-in electromagnetic/thermal sensitive elements without disturbing the external electromagnetic/thermal signal. The proposed electromagnetic-thermal cloak may have potential advantage in dealing with omnidirectional electromagnetic compatibility/shielding and multi-directional thermal management/dissipation of an on-chip system. Copyright © 2023, The Authors. All rights reserved.

关键词： Heat transfer

Effects of Surface Roughness of Ag Thin Films on Surface-enhanced Raman Spectroscopy of Graphene: Spatial Nonlocality and Physisorption Strain

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Effects of Surface Roughness of Ag Thin Films on Surface-enh...

第三届等离激元光子学前沿国际会议

作者： Xin Liu Yuda Zhao Yang Chai Dangyuan Lei Department of Applied Physics The Hong Kong Polytechnic University Key Lab of Advanced Transducers and Intelligent Control System of Ministry of Education and College of Physics and Optoelectronics Taiyuan University of Technology

＜正＞Metallic nanostructures are widely used for surface-enhanced Raman spectroscopy（SERS）.Nanoscale surface corrugation significantly affects the localized plasmon response and the subsequent Raman intensity of th...

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Ultra-broadband acoustic absorber based on periodic acoustic rigid-metaporous composite array

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arXiv 2024年

作者： Zhang, Dongguo Sun, Fei Liu, Yichao Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province College of Electronic Information and Optical Engineering Taiyuan University of Technology Taiyuan030024 China

To address the increasingly serious issue of noise pollution, we propose an ultra-broadband and wide-angle acoustic absorber based on a periodic acoustic rigid-metaporous composite array. Numerical simulation results verify the broadband good acoustic absorption performance of the proposed absorber, which can achieve an average absorption coefficient of approximately 90.9% within the frequency band from 500 to 4000 Hz with incident angles ranging from -75 to +75 degrees, thus compensating for the shortcomings of traditional acoustic absorbers that are not as effective at low frequencies. This work will provide a new approach for ultra-broadband and wide-angle acoustic wave absorption and noise suppression. Copyright © 2024, The Authors. All rights reserved.

关键词： Acoustic wave absorption

Communication, ocean, and meteorological satellite orbit determination analysis considering maneuver scheme

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Communication, ocean, and meteorological satellite orbit det...

AIAA/AAS Astrodynamics Specialist Conference, 2006

作者： Hwang, Yoola Lee, Byoung-Sun Kim, Hae-Yeon Kim, Jaehoon Kim, Haedong Shin, Hyo-Sang Electronics and Telecommunications Research Institute Daejeon 305-350 Korea Republic of Korea Aerospace Research Institute Daejeon 305-333 Korea Republic of Korea Advanced Institute of Science and Technology Daejeon 305-701 Korea Republic of Satellite Ground Control System Team Korea Republic of AIAA United States AAS Norway Korea Aerospace Research Institute Korea Republic of Flight Dynamics and Control Lab. Aerospace Engineering Korea Republic of

ISBN: (纸本)1563478226

Orbit determination (OD) analysis for geostationary Communications, Ocean, and Meteorological Satellite (COMS) is presented. Since the orbital longitude of COMS is close to that of satellite tracking site, geometric singularity affects observability. For OD, we fix velocity increment by the wheel off-loading maneuver, and the azimuth angle tracking bias is not estimated because of observability problem. Final epoch of the propagated OD based on different data arc length is used for two-day orbit prediction. The difference between truth and 48-hour predicted orbit that contains the OD error shows 4-18 km Root-Sum-Squares (RSS) in 3-D sense (one sigma) in spite of the singularity problem. Thus an operational Orbit Determination and prediction (ODP) system for COMS fulfills the requirement for 18 km RSS (one sigma) predicted positioning knowledge. Copyright © 2006 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： Space research

Association rules mining algorithm using sharing mechanism niche leaping ant colony based on apriori algorithm

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Journal of Computational and Theoretical Nanoscience 2015年第10期12卷 3223-3231页

作者： Wang, Yang Xu, Yakun Li, Gang Wang, Hongliang MicroNano System Research Center College of Information Engineering Taiyuan University of Technology Taiyuan Shanxi China Key Lab of Advanced Transducers and Intelligent Control System of the Ministry of Education Taiyuan University of Technology Taiyuan Shanxi China Ministry of Education North University of China Taiyuan China

Based on the alarm data in the information communication network under the context of big data, the paper discusses the classic association mining algorithms of Apriori and FP-Growth with living examples, elaborates the ant colony algorithm and the niche technology, combines the Apriori algorithm thought and the Travelling Salesman Problem (TSP) of the ant colony algorithm, and proposes association rules mining algorithm using Sharing mechanism Niche Leaping Ant Colony based on Apriori algorithm (SN-APLAC algorithm). The algorithm achieves the thought of "leaping ants" by accelerating support calculation through a sparse linked list and setting the route point of non frequent item sets as "stimulation point" and retains the local optimal solution to further improve the quality of association rules mining utilizing the technique of sharing mechanism niche. Copyright © 2015 American Scientific Publishers.

关键词： Association rules