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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 elab.rately 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

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

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

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

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

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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Integrative Multi-Spectral Sensor Device for Far-Infrared and Visible Light Fusion

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Photonic Sensors 2018年第2期8卷 134-145页

作者： Tiezhu QIAO Lulu CHEN Yusong PANG Gaowei YAN Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province Taiyuan University of Technology Taiyuan 030024 China Section of Transport Engineering and Logistics Faculty of 3mE Delft University of Technology Mekelweg 2 2628CD Netherlands College of Information Engineering Taiyuan University of Technology Taiyuan 030024 China

Infrared and visible light image fusion technology is a hot spot in the research of multi-sensor fusion technology in recent years. Existing infrared and visible light fusion technologies need to register before fusion because of using two cameras. However, the application effect of the registration technology has yet to be improved. Hence, a novel integrative multi-spectral sensor device is proposed for infrared and visible light fusion, and by using the beam splitter prism, the coaxial light incident from the same lens is projected to the infrared charge coupled device （CCD） and visible light CCD, respectively. In this paper, the imaging mechanism of the proposed sensor device is studied with the process of the signals acquisition and fusion. The simulation experiment, which involves the entire process of the optic system, signal acquisition, and signal fusion, is constructed based on imaging effect model. Additionally, the quality evaluation index is adopted to analyze the simulation result. The experimental results demonstrate that the proposed sensor device is effective and feasible.

关键词： Integrative multi-spectral sensor device infrared and visible fusion beam splitter prism imaging effectmodel

The lysis of bacterial cell in oscillating electric field

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The lysis of bacterial cell in oscillating electric field

中国电子学会电路与系统学会第二十五届年会

作者： Jianfeng Jin Jianmin Qin Department of Biotechnology Delft University of TechnologyJulianalaan 1362628 BL Delftthe Netherl Key Lab of Advanced Transducers and Intelligent Control System Ministry of EducationTaiyuan Univers

A new disruption method using oscillating electric field has been developed in this *** a low voltage oscillating electric field,Eschericia coli cells were effectively disrupted and recombinant proteins were released showing enzymatic *** oscillating frequencies were tested to optimize the disruption of cells but no significant influence of frequency on cell lysis was *** method can be further developed for sterilization of beverages and diary products and used by microfluidic or high throughput screening devices to detect bio-molecules.

关键词： oscillating electric field cell disruption sterilization microfluidic device high throughput screening

Supersolid and pair correlations of the extended Jaynes-Cummings-Hubbard model on triangular lattices

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Physical Review A 2019年第3期100卷 033614-033614页

作者： Lijuan Guo Sebastian Greschner Siyu Zhu Wanzhou Zhang College of Physics and Optoelectronics Taiyuan University of Technology Taiyuan 030024 China Department of Quantum Matter Physics University of Geneva 1211 Geneva Switzerland Key Lab of Advanced Transducers and Intelligent Control System of Ministry of Education Taiyuan University of Technology Taiyuan 030024 China

We study the extended Jaynes-Cummings-Hubbard model on triangular cavity lattices and zigzag ladders. By using density-matrix renormalization-group methods, we observe various types of solids with different density patterns and find evidence for light supersolids, which exist in extended regions of the phase diagram of the zigzag ladder. Furthermore, we observe strong pair correlations in the supersolid phase due to the interplay between the atoms in the cavities and atom-photon interaction. By means of cluster mean-field simulations and a scaling of the cluster size extending our analysis to two-dimensional triangular lattices, we present evidence for the emergence of a light supersolid in this case also.

关键词： Supersolids Cold gases in optical lattices Hubbard model