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Progress in Natural Science:Materials International 2021年第3期31卷 379-386页

作者： Yanqiang Cao Tiancheng Lai Furui Teng Chang Liu Aidong Li National Laboratory of Solid State microstructures Materials Science and Engineering Department College of Engineering and Applied Sciences Collaborative Innovation Center of Advanced Microstructures Nanjing University institute of micro-nano photonic & beam steering School of Science Nanjing University of Science and Technology

In this work, a highly stretchable and sensitive strain sensor using silver nanowires(Ag NWs)/multi-walled carbon nanotubes(MWCNTs) on hair band is proposed. The fabrication process of such sensors enabled scalable and facile production with low cost by dipping hair band into Ag NWs/MWCNTs composites suspension. The sensing performance of the sensors was optimized by tuning the Ag NWs/MWCNTs mass ratio. The hair band based strain sensor with Ag NWs/MWCNTs mass ratio of 30 exhibited the best performance with high sensitivity of 416.0 and good stretchability up to 70%. Moreover, great repeatability and long-term stability could be achieved over 7500 cycles of stretch-release. This Ag NWs/MWCNTs-hair band sensor can be used for monitoring human motions and swallowing action.

关键词： Carbon nanotubes Silver nanowires Strain sensor Stretchable electronics Human motion detection

Controlling Airy-Bessel Light Bullets in an Optically Induced Potential

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Communications in Theoretical Physics 2019年第6期71卷 741-745页

作者： Zhen-Kun Wu Yu-Zong Gu institute of micro/nano photonic Materials and Applications School of Physics and Electronics Henan University

We investigate numerically the curious evolution of self-decelerating Airy-Bessel light bullets carrying different topological charges(TC), launched in the three-dimensional(3 D) Schr?dinger equation with an induced parabolic potential. We present their spatiotemporal profile during propagation. In our paper, the number of TC, the modulation depth, and the induced potential are considered simultaneously. The propagation properties of light bullets result from a combination of these effects. Our scheme is distinctly different from the linear light bullets in free space, in which the localized wave packets propagate in a self-consistent trapping potential.

关键词： Airy-Bessel light bullet self-decelerating optically induced potential topological charges 3D Schrodinger equation

Concept and proof for an all-silicon MEMS micro speaker utilizing air chambers

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microsystems & nanoengineering 2019年第1期5卷 196-206页

作者： Bert Kaiser Sergiu Langa Lutz Ehrig Michael Stolz Hermann Schenk Holger Conrad Harald Schenk Klaus Schimmanz David Schuffenhauer Fraunhofer-institute for photonic microsystems 01109 DresdenGermany Chair of micro and nano Systems Brandenburg University of Technology Cottbus-Senftenberg03013 CottbusGermany

MEMS-based micro speakers are attractive candidates as sound transducers for smart devices,particularly wearables and *** such devices,high sound pressure levels,low harmonic distortion and low power consumption are required for industrial,consumer and medical *** ability to integrate with microelectronic circuitry,as well as scalable batch production to enable low unit costs,are the key factors benchmarking a *** nanoscopic Electrostatic Drive based,novel micro speaker concept presented in this work essentially comprises inplane,electrostatic bending actuators,and uses the chip volume rather than the its surface for sound *** describe the principle,design,fabrication,and first characterization *** design options and governing equations are given and *** a standard acoustical test setup(ear simulator),a MEMS micro speaker generated a sound pressure level of 69 dB at 500 Hz with a total harmonic distortion of 4.4%,thus proving the *** potential on sound pressure as well as linearity improvement is *** expect that the described methods can be used to enhance and design other MEMS devices and foster modeling and simulation approaches.

关键词： sound utilizing distortion

Polarization-Selective Collimation Effect with a Reflective Plasmonic Cavity

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Chinese Physics Letters 2012年第7期29卷 246-249页

作者： MAO Fei-Long XIE Jin-Jin FAN Qing-Yan ZHANG Li-Jian AN Zheng-Hua institute of Advanced Materials State Key Laboratory of Surface Physics and Key Laboratory of Micro and Nano Photonic Structures(Ministry of Education)Fudan UniversityShanghai 200433

We report that a metal-dielectric-metal cavity with a perforated top metallic filn shows a remarkable polarizationselective collimation effect through reflection on the perforated *** to simulations,such plasmonic cav... 详细信息

关键词： incident transverse perfect

Enhanced Kerr nonlinearity in a left-handed three-level atomic system driven by a bichromatic field

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Chinese Physics B 2013年第11期22卷 304-310页

作者：杨晓雨姜永远 Department of Physics Harbin Institute of Technology Key Lab of micro-Optics and photonic Technology of Heilongjiang Province

China） Enhanced Kerr nonlinearity in a left-handed atomic system consisting of three levels driven by a bichromatic field is presented in this paper. Based on bichromatic field coherence, the real parts of the permittivity and permeability can obtain negative values simultaneously in the same detuning frequency region. By adjusting the frequency difference and the Rabi frequencies of the bichromatic field, the multi-band left-handed behavior of the presented atomic metamaterial is exhibited. Meanwhile, the enhanced Kerr nonlinearity can be realized in this multi-band left-handed three-level atomic system. It is shown that the third-order susceptibility possesses focusing or defocusing properties in the same frequency band.

关键词： left-handed Kerr nonlinearity bichromatic field multi-band

Enhancement of light extraction efficiency in OLED with two-dimensional photonic crystal slabs

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Chinese Optics Letters 2006年第6期4卷 353-356页

作者：闫荣金王庆康 institute of micro and nano-Science and Technology National Key Laboratory of nano/micro Fabrication Technology Shanghai Jiao Tong University

Light extraction efficiency of organic light emitting diode （OLED） based on various photonic crystal slab （PCS） structures was studied. By using the finite-difference time-domain （FDTD） method, we investigated the effect of several parameters, including filling factor and lattice constant, on the enhancement of light extraction efficiency of three basic PCSs, and got the most effective one. Two novel designs of ＂interlaced＂ and ＂double-interlaced＂ PCS structures based on the most effective basic PCS structure were introduced, and the ＂interlaced＂ one was proved to be even more efficient than its prototype. Large enhancement of light extraction efficiency resulted from the coupling to leaky modes in the expended light cone of a band structure, the diffraction in the space between columns, as well as the strong scattering at indium-tinoxide/glass interfaces.

关键词： Enhancement of light extraction efficiency in OLED with two-dimensional photonic crystal slabs OLED

Atomic Layer Deposition of High-Capacity Anodes for Next-Generation Lithium-Ion Batteries and Beyond

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Energy & Environmental Materials 2021年第3期4卷 363-391页

作者： Yanqiang Cao Xiangbo Meng Aidong Li institute of micro-nano photonic&beam steering School of ScienceNanjing University of Science and TechnologyNanjing 210094China Department of Mechanical Engineering Center for Advanced Surface EngineeringUniversity of ArkansasFayetteville AR 72701USA Materials Science and Engineering Department National Laboratory of Solid State MicrostructuresCollege of Engineering and Applied SciencesCollaborative Innovation Center of Advanced MicrostructuresJiangsu Key Laboratory of Artificial Functional MaterialsNanjing UniversityNanjing 210093China

Electrification has great impacts on our modern *** electrify future transportation,state-of-the-art lithium-ion batteries(LIBs)are still not sufficient in multiple aspects including cost,energy density,lifespan,and *** this end,next-generation high-energy LIBs and beyond are highly *** this regard,high-capacity anodes are undergoing intensive investigation,such as silicon,SnO_(2),and lithium ***,such anode materials are commonly experiencing large volume changes and related issues,which are reflected on mechanical degradation,capacity fading,low efficiency,and unsatisfactory *** address these challenges,many technical strategies have been *** the past decade,atomic layer deposition(ALD)has emerged as a new promising technique enabling atomic-scale surface modification and nanoscale design of high-capacity anodes for high *** this review,recent ALD studies on developing high-capacity anodes for LIBs and beyond are thoroughly *** addition,ALD strategies and their effectiveness in pursing high-energy LIBs and beyond are ***,we highlighted the latest advances of ALD for addressing the notorious issues associated with Li metal *** is expected that this work will promote the applications of ALD in new battery systems.

关键词： atomic layer deposition high-capacity anodes lithium-ion batteries and beyond nanostructured electrodes surface coating

Time amplifying techniques towards atomic time resolution

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Science China(Technological Sciences) 2009年第12期52卷 3425-3446页

作者： LI JingZhen institute of photonic Engineering,College of Electron Science&Technology,Shenzhen University,and Shenzhen Key Laboratory of micro·nano photonic Information,Shenzhen 518060,China 1. institute of photonic Engineering College of Electron Science & Technology Shenzhen University and Shenzhen Key Laboratory of Micro-Nano Photonic Information Shenzhen 518060 China

High speed imaging technology has opened applications in many fields,such as collision,detonating, high voltage discharge,disintegration and transfer of phonon and exciton in solid,photosynthesis primitive reaction,and electron dynamics inside atom *** principle,all of the transient processes need to be explained theoretically and,at the same time,the time amplifying technique is required for observations of these *** present review concerns the atomic time amplifying mechanism of optical information and the extremely-high speed imaging methods,which are expressed in terms of the short time amplifying *** is well-known that for extremely-high speed imaging with the converter tube,the temporal resolution is in the order of sub-picosecond of the streak imaging,and the imaging frequency is 6×10 8 ―5×10 9 fps(frame per second)of the frame *** the other hand,for the tubeless extremely-high speed imaging,the imaging frequency is 10 7 ―10 14 fps,and its mechanism of forming high speed and framing could involve a lot of factors of the light under investigation,for instance,light speed,light parallelism,the parameters of light wave such as amplitude,phase,polari- zation and wavelength,and even quantum properties of *** the cascaded system of electro- magnetic wave and particle wave,it is possible to simultaneously realize extremely-high resolution in time and space,which is higher than a kite *** it would be possible to break the limit of the Heisenberg uncertainty relation of the optical frequency band.

关键词： time amplification image converter tube imaging tubeless imaging ultra-high speed imaging extremely-high speed imaging holog- raphic coherent shutter optical acceleration

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Enhanced performances of InGaN/GaN-based blue light-emitting diode with InGaN/AlInGaN superlattice electron blocking layer

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Chinese Physics B 2014年第6期23卷 608-612页

作者：卓祥景章俊李丹伟易翰翔任志伟童金辉王幸福陈鑫赵璧君王伟丽李述体 Laboratory of nano-photonic Functional Materials and Devices Institute of Opto-electronic Materials and Technology South China Normal University

InGaN/AIlnGaN superlattice （SL） is designed as the electron blocking layer （EBL） of an InGaN/GaN-based light- emitting diode （LED）. The energy band structure, polarization field at the last-GaN-barrier/EBL interface, carrier concen- tration, radiative recombination rate, electron leakage, internal quantum efficiency （IQE）, current-voltage （l-V） perfor- mance curve, light output-current （L-l） characteristic, and spontaneous emission spectrum are systematically numerically investigated using APSYS simulation software. It is found that the fabricated LED with InGaN/AIInGaN SL EBL exhibits higher light output power, low forward voltage, and low current leakage compared with those of its counterparts. Meanwhile, the efficiency droop can be effectively mitigated. These improvements are mainly attributed to the higher hole injection efficiency and better electron confinement when InGaN/AIlnGaN SL EBL is used.

关键词： light-emitting diode InGaN/AIlnGaN superlattice efficiency droop

The push-pull principle:an electrostatic actuator concept for low distortion acoustic transducers

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microsystems & nanoengineering 2022年第6期8卷 181-194页

作者： Bert Kaiser Hermann A.G.Schenk Lutz Ehrig Franziska Wall Jorge M.Monsalve Sergiu Langa Michael Stolz Anton Melnikov Holger Conrad David Schuffenhauer Harald Schenk Fraunhofer institute for photonic microsystems IPMS DresdenGermany Arioso Systems GmbH since Sep.1st 2022:BOSCH Sensortec GmbHDresdenGermany Chair of micro and nano Systems Brandenburg University of Technology Cottbus-SenftenbergCottbusGermany

Electrostatic actuators are of particular interest for microsystems(MEMS),and in particular for MEMS audio transducers for use in advanced true wireless *** are attractive because of their typically low electrical capacitance and because they can be fabricated from materials that are compatible with standard complementary metal-oxide semiconductor(CMOS)*** high audio performance and in particular low harmonic distortion(THD)the implementation of the push-pull principle provides strong *** an arrangement of three electrodes in a conjunct moving configuration on a beam,we demonstrate here for the first time a balanced bending actuator incarnating the push-pull principle operating at low *** first design already exhibits a harmonic distortion as low as 1.2%at 79 dB using a signal voltage of only 6 V_(p) and a constant voltage of only±10 V_(dc) in a standard acoustic measurement ***,exceeding our previously reported approach in all three key performance indications at the same *** expect that our novel electrode configurations will stimulate innovative electrostatic actuator developments for a broad range of *** this paper we report the basic theory,the fabrication and the performance of our novel actuator design acting as an audio transducer.

关键词： distortion push electrostatic