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Photonic Fibrous Liquid Crystal Elastomer Actuators

Chinese Journal of Polymer Science 2025年第4期43卷 597-604页

作者： Yun-Long Li Kai Liu Hui-Min Wu Jiu-An Lv Department of Materials Science Fudan UniversityShanghai200433China Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of EngineeringWestlake UniversityHangzhou310024China Institute of Advanced Technology Westlake Institute for Advanced StudyHangzhou310024China

Photonic fibrous soft actuators that can modulate light and produce responsive deformation would have broad technological implications in areas,ranging from smart textiles and intelligent artificial muscles to medical ***,creating such multifunctional soft actuators has proved tremendously ***,we report novel cholesteric liquid crystal elastomer(CLCE)based photonic fibrous soft actuators(PFSAs).CLCE can serve as chiral photonic soft active material and allow for multiresponse in shapes and *** leveraged a tubularmold-based processing technology to prepare fibrous CLCE actuators,and the prepared actuators exhibit the capabilities to dynamically switch structural colors and geometrical shapes by mechanical,temperature,or light ***-based PFSAs demonstrate diverse functionalities,including visual weight feedback,optically driven object manipulation,and light driven *** is anticipated that our PFSAs would offer many new possibilities for developing advanced soft actuators.

关键词： Cholesteric liquid crystal elastomers Photonic fibers Soft actuators Stimuli response

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Oxide Phototransistor Array With Multiply-and-Accumulation Functions for In-Sensor Image Processing

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IEEE Journal of the Electron devices Society 2025年 13卷 378-382页

作者： Wang, Saisai Jing, Xiaotao Zhang, Wanlin Wang, Rui Wang, Hong Huang, Qi Westlake Institute for Optoelectronics Zhejiang Key Laboratory of 3D Micro/Nano Fabrication and Characterization Hangzhou311421 China Xidian University State Key Laboratory of Wide Band Gap Semiconductor Devices and Integrated Technology School of Microelectronics Xi’an710071 China

Advanced in-sensor computing paradigm has gradually become a research hotspot in this IOT era of sensor data proliferation. However, most existing in-sensor computing devices are plagued by a complex structure, and the uniformity of the sensor array is difficult to ensure. Moreover, photoconductive devices are incapable of achieving on-chip current summation because the regulation of photoresponsivity usually leads to inconsistent dark current, thereby impeding the practical implementation of artificial neural networks (ANNs) on the sensor array. In this work, we developed a 3 × 3 ultraviolet (UV) image sensor array based on solution-processed indium oxide (In2O3) phototransistors. The devices exhibit tunable responsivity and unified dark current under negative gate voltage (Vgs), enabling the direct execution of multiply-and-accumulation (MAC) operations. Consequently, two key applications of ANN were successfully demonstrated: image convolution and classification. © 2013 IEEE.

关键词： Phototransistors

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212-km ultra-long-distance hybrid Φ-OTdR/BOTdR based on remotely pumped optical amplification

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Optics Express 2025年第7期33卷 15827-15837页

作者： Lei, Yanyang Tang, Xiaohui Xia, Meng Jiang, Taofei Liu, Shuaiqi Li, Tianfu Ba, dexin dong, Yongkang National Key Laboratory of Laser Spatial Information Harbin Institute of Technology Harbin150001 China Harbin Institute of Technology Zhengzhou Research Institute Zhengzhou450007 China Zhejiang Key Laboratory of 3d Micro/Nano Fabrication and Characterization Westlake Institute for Optoelectronics Fuyang Zhejiang Hangzhou311421 China

In this paper, we propose and demonstrate a 212 km ultra-long-distance hybrid distributed optical fiber sensing (dOFS) system capable of simultaneously measuring vibration and strain/temperature along the sensing fiber. This is achieved by integrating phase-sensitive optical time-domain reflectometry (Φ-OTdR) and Brillouin optical time-domain reflectometry (BOTdR) into a single interrogator. The extended sensing range is realized through the use of wavelength division multiplexing, time division multiplexing, co-pumped distributed Raman amplification, and remotely pumped optical amplification technologies. The system achieves a 20 m spatial resolution for vibration sensing and a 50 m resolution for strain/temperature sensing, with strain/temperature measurement accuracy reaching 4.3 MHz. Notably, the single-end operation and simplified system architecture make this solution highly suited for industrial on-site applications. To our knowledge, this is the longest measurement range reported for hybrid dOFS systems without the aid of active repeaters or bi-directional distributed amplification techniques. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Optical fibers

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High-Temperature Stealth Across Multi-Infrared and microwave Bands with Efficient Radiative Thermal Management

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nano-micro Letters 2025年第8期17卷 533-547页

作者： Meng Zhao Huanzheng Zhu Bing Qin Rongxuan Zhu Jihao Zhang Pintu Ghosh Zuojia Wang Min Qiu Qiang Li State Key Laboratory of Extreme Photonics and Instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhou 310027People’s Republic of China College of Information Science and Electronic Engineering Zhejiang UniversityHangzhou 310027People’s Republic of China Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of EngineeringWestlake UniversityHangzhou 310024People’s Republic of China

High-temperature stealth is vital for enhancing the concealment,survivability,and longevity of critical ***,achieving stealth across multiple infrared bands—particularly in the short-wave infrared(SWIR)band—along with microwave stealth and efficient thermal management at high temperatures,remains a significant ***,we propose a strategy that integrates an IR-selective emitter(Mo/Si multilayer films)and a microwave metasurface(TiB2–Al2O3–TiB2)to enable multi-infrared band stealth,encompassing mid-wave infrared(MWIR),long-wave infrared(LWIR),and SWIR bands,and microwave(X-band)stealth at 700℃,with simultaneous radiative cooling in non-atmospheric window(5–8μm).At 700℃,the device exhibits low emissivity of 0.38/0.44/0.60 in the MWIR/LWIR/SWIR bands,reflection loss below−3 dB in the X-band(9.6–12 GHz),and high emissivity of 0.82 in 5–8μm range—corresponding to a cooling power of 9.57 kW m^(−2).Moreover,under an input power of 17.3 kW m^(−2)—equivalent to the aerodynamic heating at Mach 2.2—the device demonstrates a temperature reduction of 72.4℃ compared to a conventional low-emissivity molybdenum surface at high *** work provides comprehensive guidance on high-temperature stealth design,with far-reaching implications for multispectral information processing and thermal management in extreme high-temperature environments.

关键词： Stealth High temperature Multispectral Thermal management

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A decade Review of Video Compressive Sensing:A Roadmap to Practical Applications

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Engineering 2025年第3期46卷 172-185页

作者： Zhihong Zhang Siming Zheng Min Qiu Guohai Situ david J.Brady Qionghai dai Jinli Suo Xin Yuan Department of Automation Tsinghua UniversityBeijing 100084China Research Center for Industries of the Future(RCIF)&School of Engineering Westlake UniversityHangzhou 310030China Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of EngineeringWestlake UniversityHangzhou 310024China Shanghai Institute of Optics and Fine Mechanics Chinese Academy of SciencesShanghai 201800China Wyant College of Optical Sciences University of ArizonaTucsonAZ 85721USA Shanghai Artificial Intelligence Laboratory Shanghai 200232China

It has been over a decade since the first coded aperture video compressive sensing(CS)system was *** underlying principle of this technology is to employ a high-frequency modulator in the optical path to modulate a recorded high-speed scene within one integration *** superimposed image captured in this manner is modulated and compressed,since multiple modulation patterns are *** this,reconstruction algorithms are utilized to recover the desired high-speed *** leading advantage of video CS is that a single captured measurement can be used to reconstruct a multi-frame video,thereby enabling a low-speed camera to capture high-speed *** by this,a number of variants of video CS systems have been built,mainly using different modulation ***,in order to obtain high-quality reconstruction videos,many algorithms have been developed,from optimization-based iterative algorithms to deep-learning-based ***,emerging deep learning methods have been dominant due to their high-speed inference and high-quality reconstruction,highlighting the possibility of deploying video CS in practical *** this end,this paper reviews the progress that has been achieved in video CS during the past *** further analyze the efforts that need to be made—in terms of both hardware and algorithms—to enable real *** gaps are put forward and future directions are summarized to help researchers and engineers working on this topic.

关键词： Video compressive sensing Computational imaging deep learning Practical applications

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Phototunable Rayleigh 3d Soft Self-Oscillator Enabling Versatile Biomimetic Tubular Peristaltic Pumping

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Advanced Materials 2025年 e2502434页

作者： Zhao, Tonghui Lv, Jiu-an Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of Engineering Westlake University Zhejiang Province Hangzhou310024 China School of Engineering Westlake University Zhejiang Hangzhou310030 China

Living tubular organs can spatiotemporally and cyclically deform their muscular walls to implement adaptable and sustainable peristaltic pumping applicable to broad matter, achieved via asymmetric and non-equilibrium self-oscillating deformations of muscular walls. However, man-made tubular soft actuators have been limited to pumping a few simple matters, because of their reciprocal and monotonic wall motions that cannot break time-reversal symmetry and system equilibrium to gain adaptable and sustainable pumping. Here, a phototunable Rayleigh 3d soft self-oscillator (PR3dSSO) capable of multimodal, nonreciprocal, self-sustainable wall deformations is presented. PR3dSSO's design leverages two direction-and-dimension-phototunable tubular instabilities: snapping and postbuckling. The post-buckling instability can generate local-wall origami which cannot only fold local walls into multimodal shape-mode waves, but also break wall-motion symmetry;snapping instabilities help break equilibrium in wall motions to initiate autonomous wall motions. These phototunable-instabilities-driven wall deformations unprecedentedly create Rayleigh-like 3d wall motions, which allow for versatile biomimetic tubular peristaltic pumping adapt to broad matter. Our PR3dSSO would spur creative life-like active-material designs and novel pumping functions. © 2025 Wiley-VCH GmbH.

关键词： Liquid crystals

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Approaching the thermal emissivity limit with ultrathin MXene films

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Optica 2025年第5期12卷 685-692页

作者： dai, Cenzhen Zhu, Huanzheng Qin, Rui Qin, Bing Zhao, Meng Ghosh, Pintu Qiu, Min Li, Qiang State Key Laboratory of Extreme Photonics and Instrumentation College of Optical Science and Engineering Zhejiang University Hangzhou310027 China Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of Engineering Westlake University Hangzhou310024 China

Control over thermal emission has garnered increasing attention, driven by the long-standing objective of achieving the theoretical limits of thermal emissivity in devices. However, conventional thermal emitters either approach the thermal emissivity limit at the cost of substantial thickness, or are ultrathin but fail to approach this limit due to impedance mismatch. In this work, we demonstrate that ultrathin MXene films (∼10 nm) can effectively achieve impedance matching. A double-sided emitter, consisting of a suspended ultrathin MXene film, achieves a thermal emissivity limit of 0.5 in the 6–15 µm wavelength band. A single-sided emitter, formed by integrating the double-sided emitter within a resonator, attains emissivity close to unity at 10.8 µm based on Fabry–Perot resonance with critical coupling. This work paves the way for ultimate control of thermal emissivity in emitter design and has significant implications for energy harvesting and thermal management applications, including infrared imaging, light sources, and thermophotovoltaics. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Thermoluminescence

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Free-space high-Q nanophotonics

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Light: Science and Applications 2025年第1期14卷 1-18页

作者： Yu, Jianbo Yao, Wenzhe Qiu, Min Li, Qiang State Key Laboratory of Extreme Photonics and Instrumentation College of Optical Science and Engineering Zhejiang University Hangzhou310027 China Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of Engineering Westlake University Hangzhou310024 China

High-Q nanophotonic devices hold great importance in both fundamental research and engineering applications. Their ability to provide high spectral resolution and enhanced light-matter interactions makes them promising in various fields such as sensing, filters, lasing, nonlinear optics, photodetection, coherent thermal emission, and laser stealth. While Q-factors as large as 109 have been achieved experimentally in on-chip microresonators, these modes are excited through near-field coupling of optical fibers. Exciting high-Q modes via free-space light presents a significant challenge primarily due to the larger fabrication area and more lossy channels associated with free-space nanophotonic devices. This Review provides a comprehensive overview of the methods employed to achieve high-Q modes, highlights recent research progress and applications, and discusses the existing challenges as well as the prospects in the field of free-space high-Q nanophotonics. © The Author(s) 2025.

关键词： nanophotonics

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Tattooing water bears: microfabrication on living organisms

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Science Bulletin 2025年

作者： Yang, Zhirong Wu, Shan Zhao, Kang Zhao, ding Qiu, Min Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of Engineering Westlake University Hangzhou310030 China Westlake Institute for Optoelectronics Hangzhou311421 China Institute of Advanced Technology Westlake Institute for Advanced Study Hangzhou310024 China

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Quantum Geometric Origin of Strain-Induced Ferroelectric Phase Transitions

arXiv

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arXiv 2025年

作者： Hu, Jiaming Zhu, Ziye Yuan, Yubo Li, Wenbin Wang, Hua Chang, Kai Center for Quantum Matter School of Physics Zhejiang University Hangzhou310058 China School of Engineering Westlake University Hangzhou310030 China Zhejiang Key Laboratory of 3D Micro/Nano Fabrication and Characterization Westlake University Hangzhou310030 China

Strain-regulated ferroelectric (FE) materials have long attracted significant attention due to their diverse applications. While soft-phonon theory and the (pseudo) Jahn-Teller effect have achieved considerable success in providing phenomenological descriptions and general understanding, the detailed connection between these perspectives and their microscopic dependence on strain regulation remains unclear. Here, under the framework of density-functional perturbation theory (dFPT), we demonstrate that the Berry curvature of electron-phonon coupling (EPC) plays a pivotal role in the interatomic force matrix (IFM). A subsequent model analysis shows that external strain can reverse the polarity of the EPC Berry curvature in (quasi)-degenerate electronic subsystems through band inversion, thereby directly leading to phonon softening. The general theory is then applied to the BiOCl monolayer as a benchmark, which offers an accurate description of the density functional theory (dFT) calculations. This mechanism is further observed across a broad range of materials through ab initio calculations, providing an insightful perspective on EPC quantum geometry in lattice dynamics and FE phase transitions. Copyright © 2025, The Authors. All rights reserved.

关键词： Perturbation techniques

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