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High-Q unidirectional polarization singularities

Physical Review Applied 2025年第5期23卷 054020-054020页

作者： Chuanlin Li Wenhao Wang Jianfeng Chen Mengqi Liu Aobo Ren Cheng-Wei Qiu Hongxing Xu Zhiming Wang Jiang Wu Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu 610054 China Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore Centre for Disruptive Photonic Technologies The Photonics Institute Nanyang Technological University Singapore 637371 Singapore Department of Electrical and Computer Engineering National University of Singapore Singapore 117583 Singapore Institute of Engineering Thermophysics School of Mechanical Engineering Shanghai Jiao Tong University Shanghai 200240 China School of Physics and Technology Center for Nanoscience and Nanotechnology and Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education Wuhan University Wuhan 430072 China

Unidirectional guided resonances (UGRs), which are eigenstates that radiate exclusively in a single channel, are promising for advancing diverse photonic devices. However, existing approaches face an inherent trade-off between achieving high-Q factors and maximizing the radiation-asymmetry ratios. To address this challenge, we propose a scheme that exploits both out-of-plane and in-plane couplings to generate bound states in the continuum with precise radial and rotational control in momentum space. This approach effectively decouples the Q factors of UGRs from their radiation-asymmetry ratios. As a result, we achieve UGRs with Q factors exceeding 104, which is 1–2 orders of magnitude higher than traditional UGRs. Furthermore, we demonstrate the ability to reverse the emission direction of these UGRs, leading to a broad range of radiation-asymmetry ratios from −53 to 55 dB. We further validate the practical realization of high-Q UGRs using a silicon-on-silica system. Our findings provide a versatile method for generating high-Q UGRs, offering alternative pathways for innovations in nonlinear optics, light-matter interactions, and advanced optoelectronic applications.

关键词： Nonlinear optics

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Numerical optimization approach of the gap between the magnet and coil for electromagnetic vibration energy harvesters design

Numerical optimization approach of the gap between the magne...

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16th Annual Conference and 5th International Conference on Chinese Society of micro-nano technology, CSMNT 2014

作者： Lei, Yiming Wen, Zhiyu Key Laboratory of Fundamental Science on Micro/Nano Device and System Technology Chongqing University China National Center for International Research of Micro/Nano System and New Material Technology Chongqing University China Micro System Research Center of Chongqing University Chongqing China

ISBN: (纸本)9783038354628

In the design of the micro electromagnetic vibration harvester, an important goal is maximization of the magnetic flux linkage gradient, which directly determines the induced voltage and output power of the electromagnetic vibration harvester. This paper established a numerical model based on structure of the electromagnetic vibration energy harvester. An analytic expression for the magnetic field of rectangular permanent magnets is used to build up an electromagnetic coupling model. The magnetic field distribution of the rectangular permanent magnet was analyzed. The effects of the gap between the magnet and the coil on the load voltage of the electromagnetic vibration energy harvester were investigated. According to the formula, the magnetic flux linkage and flux gradient were calculated to optimize the geometrical parameter of the magnet and coil. The method and boundary conditions of optimizing the gap between the magnet and coil were presented. The maximum output voltage can be obtained by optimizing the gap between the magnet and the coil. A simple prototype was fabricated and measured to validate the theoretical deducing and the feasibility of method. © (2015) Trans Tech Publications, Switzerland.

关键词： Energy harvesting

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Fabrication of aluminum nitride films by reactive pulse DC magnetron sputtering for vibration energy harvester

Fabrication of aluminum nitride films by reactive pulse DC m...

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16th Annual Conference and 5th International Conference on Chinese Society of micro-nano technology, CSMNT 2014

作者： Shang, Zhengguo Li, Dongling Wang, Shengqiang National Key Laboratory of Fundamental Science of Micro/Nano-Device and System Technology Chongqing University Chongqing China Microsystem Research Center of Chongqing University Chongqing China

ISBN: (纸本)9783038354628

Aluminum nitride(AlN) film as a piezoelectric material has been used widely, particularly in vibration energy harvester due to its unique and enhanced properties such as high temperature resistance and compatibility with CMOS processes. In this work, AlN film with (002) preferred orientation was prepared on silicon wafers by pulse DC reactive magnetron sputtering(RMS), and the properties such as peak intensity, full width at half maximum (FWHM) and surface morphology were investigated by x-ray diffraction (XRD) and scanning electron microscopy (SEM). The preferred orientation was found to be sensitive to deposition conditions such as gas flow rate, power, bottom electrodes materials and substrates temperature. The results shows that the intensity was 1.1×105 counts, the FWHM was 1.9°when the temperature was 260°C. The film was used to fabricate the vibrated energy harvester successful and the power density reached about 3000uW/cm3 at the vibration frequency under 1g acceleration. © (2015) Trans Tech Publications, Switzerland.

关键词： Magnetron sputtering

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Stretchable multifunctional wearable system for real-time and on-demand thermotherapy of arthritis

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microsystems and nanoengineering 2025年第1期11卷 1-12页

作者： Liu, Zehan Wang, Xihan He, Yiyang Hong, Weiqiang Sun, Peng Liu, Weitao Ye, Dong Yang, Zhuoqing Wang, Xuewen Wu, Mengxi Wang, Liding Liu, Junshan State Key Laboratory of High-performance Precision Manufacturing Dalian University of Technology Liaoning Dalian116024 China Key Laboratory for Micro/Nano Technology and System of Liaoning Province Dalian University of Technology Liaoning Dalian116024 China State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and Technology Wuhan430074 China National Key Laboratory of Science and Technology on Micro and Nano Fabrication School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai200240 China Institute of Flexible Electronics Northwestern Polytechnical University Xi’an710072 China

Thermotherapy is a conventional and effective physiotherapy for arthritis. However, the current thermotherapy devices are often bulky and lack real-time temperature feedback and self-adjustment functions. Here, we developed a multifunctional wearable system for real-time thermotherapy of arthritic joints based on a multilayered flexible electronic device consisting of homomorphic hollow thin-film sensors and heater. The kirigami−serpentine thin-film sensors provide stretchability and rapid response to changes in environmental temperature and humidity, and the homomorphic design offers easy de-coupling of dual-modal sensing signals. Based on a closed-loop control, the thin-film Joule heater exhibits rapid and stable temperature regulation capability, with thermal response time © The Author(s) 2025.

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Bionics-inspired highly robust and fatigue-resistant hydrogel composite elastomers with multi-applications

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Chemical Engineering Journal 2025年 516卷

作者： Shen, Jiaxin Huang, Haizhou Li, Chen Shi, Huihui Hou, Shisheng Yin, Kuibo Bi, Hengchang Wan, Shu Sun, Litao SEU-FEI Nano-Pico Center Key Laboratory of MEMS of Ministry of Education Collaborative Innovation Center for Micro/Nano Fabrication Device and System Southeast University Nanjing210096 China Key Laboratory of Opto-Electronic Science and Technology for Medicine of Ministry of Education Fujian Provincial Key Laboratory of Photonics Technology College of Photonic and Electronic Engineering Fujian Normal University Fuzhou350117 China Chongqing Key Laboratory of Precision Optics Chongqing Institute of East China Normal University Chongqing401120 China In Situ Devices Center School of Integrated Circuits East China Normal University Dongchuan Road Shanghai200241 China Key Laboratory of Optoelectronic Technology and Systems Ministry of Education Key Disciplines Laboratory of Novel Micro-Nano Devices and System Technology School of Optoelectronics Engineering Chongqing University Chongqing400044 China

The key factors limiting the potential applications of hydrogels are their weak mechanical properties, specifically fatigue and hysteresis, which arise from the breakage of low-energy amorphous polymer chains within the hydrogels. To address this issue, this study presents a universal approach for fabricating composite hydrogels that exhibit remarkable elasticity and mechanical stability. The Ecoflex elastomer backbone was integrated into the organic hydrogel to mimic the cytoskeletal structure. This innovation serves to bolster the material's fatigue resistance and eliminate hysteresis. The findings reveal that the organic hydrogel/porous Ecoflex (OHPE) composite displays impressive mechanical stability. Remarkably, it can endure up to 5,000 load-unload cycles, even at a 250 % strain, with minimal alteration in its mechanical properties. Furthermore, OHPE exhibits excellent resistance to dewatering and freezing, making it a robust material for various applications. Additionally, OHPE performs admirably as strain sensors, temperature sensors, and triboelectric nanogenerators, highlighting its versatility and potential for widespread use. © 2025 Elsevier B.V.

关键词： Hydroelasticity

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Design and Comparison of micro electromagnetic vibration energy harvesters

Design and Comparison of micro electromagnetic vibration ene...

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16th Annual Conference and 5th International Conference on Chinese Society of micro-nano technology, CSMNT 2014

作者： Lei, Yiming Wen, Zhiyu Chen, Li Key Laboratory of Fundamental Science on Micro/Nano-Device and System Technology Chongqing University China Microsystem Research Center of Chongqing University Chongqing400030 China

ISBN: (纸本)9783038354628

This paper presents two electromagnetic vibration energy harvesters based on micro-electro-mechanical (MEMS) technology. Two prototypes with different vibration structures were designed and fabricated. The energy harvester includes a permanent magnet attached on vibration structure (resonator) made by Si and a fixed wire-wound coil, with the total volume of 0.9 cm3. Two energy harvesters with different resonator are tested and compared. Experiments show that: in the same acceleration and a load resistance, the resonant frequency of prototype B is approximately 95% of prototype A;The peak-peak voltage and the maximum power of prototype B is 1.6 times and 2.7 times of prototype A respectively. The test results was analyzed simply and it indicated that the electromagnetic energy harvesting with the spring B has better performance;also proved that the potential ability of the non-linear spring could extend the frequency bandwidth and improve output voltage. © (2015) Trans Tech Publications, Switzerland.

关键词： Electromagnetic induction

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Array of single crystalline anatase TiO2 nanotubes with significant enhancement of photoresponse

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Progress in Natural science:Materials International 2021年第4期31卷 536-540页

作者： Lvchao Qiu Ke Fang Yubo Li Shutao Huang Guanxing Li Songda Li Hu He Wentao Yuan Hangsheng Yang Wei Tian Yong Wang State Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University Center of Electron Microscopy School of Materials Science and Engineering Zhejiang University Key Laboratory of Micro-Nano Electronic Device and Smart System of Zhejiang Province College of Information Science & Electronic Engineering Zhejiang University School of Physical Science and Technology Soochow University

Anatase TiO2nanotubes array（ATONA） has attracted tremendous attention owing to its promising applications in solar cells, water splitting and organic pollutants photocatalytic degradation. However, the activity of ATONAs was greatly suppressed by the grain boundaries existed in the tube walls, which acted as carrier scattering and recombination centers. Herein, we report a novel strategy to prepare array of single crystalline anatase TiO2nanotubes（SC-ATONAs） with significant enhancement of the photocatalytic activity and UV photo response performance compared to the polycrystalline counterparts. The growth of SC-ATONAs was achieved by establishing a crystallization temperature gradient along the tube wall, which ensured the crystallization started from the nucleation of a single nucleus at the bottom of amorphous TiO2nanotubes prepared by Ti anodization. These findings pave the way to prepare single-crystalline nanotubes with superior performance for other materials.

关键词： Single crystallineTiO2 nanotube Crystallization temperature gradient Photo response Photocatalysis

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Enrichment efficiency optimization of dielectrophoresis cell chip based on interdigitated microelectrodes array

Enrichment efficiency optimization of dielectrophoresis cell...

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16th Annual Conference and 5th International Conference on Chinese Society of micro-nano technology, CSMNT 2014

作者： Gu, Wenwen Huang, Jie Department of Electronic and Control Engineering College of Engineering and Technology Southwest University Chongqing400715 China National Key Laboratory of Fundamental Science of Micro/Nano-Device and System Technology Chongqing University Chongqing400030 China

ISBN: (纸本)9783038354628

At present, the majority dielectrophoresis chip designs optimize their performance by electric simulation and fluid field simulation. The lack of further cells force analysis and movement prediction results in a limited cell dielectrophoresis enrichment efficiency. The HepG2 hepatoma carcinoma cell movement under the action of dielectrophoresis force, fluid force and gravity was analyzed respectively by Comsol Multiphysics software. The preliminary optimization conditions for the cell enrichment were obtained. According to the simulation results, the experiments were carried out to investigate the enrichment effect of the HepG2 hepatoma carcinoma cells. The experiment result demonstrated the enrichment efficiency of HepG2 hepatoma carcinoma cells was reached to 88.89% under the 5 V amplitude and 4 MHz frequency sinusoidal signal excitation. © (2015) Trans Tech Publications, Switzerland.

关键词： Efficiency

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Parameter extraction for sensing optimization of nanoparticle basednano fluidics sensor 19

Parameter extraction for sensing optimization of nanoparticl...

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19th International Conference on Miniaturized systems for Chemistry and Life sciences, microTAS 2015

作者： Li, Siwei Huang, Jie Wang, Wei Institute of Microelectronics Peking University China National Key Laboratory of Science and Technology on Micro/Nano Fabrication Innovation Center for Micro-Nano-Electronics and Integrated System Beijing100871 China

ISBN: (纸本)9780979806483

nanofluidic sensor had a funnel nanochannel with few nanoparticles stuck at the tip has been demonstrated as a simple, fast and inexpensive way to prepare biosensor with high sensitivity. However, the parameter of this kind of sensor was difficult to obtain so that theoretical analyzation of the experimental results was necessary. Herein, we discussed further on how to extract the device parameter and optimize the sensitivity of the sensing device. © 15CBMS-0001.

关键词： Parameter extraction

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LED induced fluorescence detector integrated in microfluidic cell chip

LED induced fluorescence detector integrated in microfluidic...

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作者： Gu, Wenwen Huang, Jie Tan, Weimin College of Engineering and Technology Southwest University No. 2 Tiansheng Road BeiBei District Chongqing400715 China National Key Laboratory of Fundamental Science of Micro Nano-Device and System Technology Chongqing University No. 174 Shazheng Shapingba Chongqing400044 China

A light-emitting diode (LED) induced fluorescence detector for the microfluidic cell chip has been proposed in this contribution. Compared with the other competitor, the optical path does not require re-calibration after the microfluidic chip has been reloaded and relocated. Last but not the least, the system has a compact size and is more energy efficient. The model selection of the excitation light module, filter sets, aperture and photoelectric detector were analysed. The angle between the exciting light path and fluorescence optical path was optimised to be 135 degrees by experiment. The optimal value of photomultiplier (PMT) working voltage and LED working current were experimentally optimised to be 3.5 V and 200 mA. HepG2 hepatoma carcinoma cells were used to validate the cell counting function of the fluorescence detector. The experimental results showed that the output was peak signals that can be obviously distinguished from background noise;there were eight peak signals with an average value of 0.7 V within 250 s, which agreed with that of fluorescence microscope imaging results. It provides a new technological approach for novel micro total cell analysis system. Copyright © 2015 Inderscience Enterprises Ltd.

关键词： microfluidic chips

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