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light(Science & Applications) 2023年第10期12卷 2145-2153页

作者： li Long Qiurong Deng Rongtao Huang jiafang li Zhi-Yuan li School of Physics and Optoelectronics South China University of TechnologyGuangzhou 510641China School of Physics Beijing Institute of TechnologyBeijing 100081China State Key Laboratory of Luminescent Materials and Devices South China University of TechnologyGuangzhou 510640China

Scanning near-field optical microscopy(SNOM)offers a means to reach a fine spatial resolution down to~10 nm,but unfortunately suffers from low transmission efficiency of optical *** we present design and 3D printing of a fiber-bound polymer-core/gold-shell spiral-grating conical tip that allows for coupling the inner incident optical signal to the outer surface plasmon polariton with high efficiency,which then adiabatically transport,squeeze,and interfere constructively at the tip apex to form a plasmonic superfocusing spot with tiny size and high *** simulations and optical measurements show that this specially designed and fabricated tip has 10%transmission efficiency,~5 nm spatial resolution,20 dB signal-to-noise ratio,and 7000 pixels per second fast scanning *** high-resolution,high throughput,and high contrast SNOM would open up a new frontier of high spatial-temporal resolution detecting,imaging,and monitoring of single-molecule physical,chemical,and biological systems,and deepen our understanding of their basic science in the single-molecule level.

关键词： optical resolution printing

Kirigami/origami:unfolding the new regime of advanced 3D microfabrication/nanofabrication with“folding”

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light(Science & Applications) 2020年第1期9卷 1309-1327页

作者： Shanshan Chen Jianfeng Chen Xiangdong Zhang Zhi-Yuan li jiafang li Key Lab of Advanced Optoelectronic Quantum Architecture and Measurement(Ministry of Education) Beijing Key Lab of Nanophotonics&Ultrafine Optoelectronic Systemsand School of PhysicsBeijing Institute of Technology100081 BeijingChina College of Physics and Optoelectronics South China University of Technology510640 GuangzhouChina

Advanced kirigami/origami provides an automated technique for modulating the mechanical,electrical,magnetic and optical properties of existing materials,with remarkable flexibility,diversity,functionality,generality,and *** this paper,we review the latest progress in kirigami/origami on the microscale/nanoscale as a new platform for advanced 3D microfabrication/*** stimuli of kirigami/origami,including capillary forces,residual stress,mechanical stress,responsive forces,and focussed-ion-beam irradiation-induced stress,are introduced in the microscale/nanoscale *** stimuli enable direct 2D-to-3D transformations through folding,bending,and twisting of microstructures/nanostructures,with which the occupied spatial volume can vary by several orders of magnitude compared to the 2D *** an instant and direct method,ion-beam irradiation-based tree-type and close-loop nano-kirigami is highlighted in *** progress in microscale/nanoscale kirigami/origami for reshaping the emerging 2D materials,as well as the potential for biological,optical and reconfigurable applications,is briefly *** the unprecedented physical characteristics and applicable functionalities generated by kirigami/origami,a wide range of applications in the fields of optics,physics,biology,chemistry and engineering can be envisioned.

关键词： regime folding enable

Technologies and applications of silicon-based micro-optical electromechanical systems:A brief review

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Journal of Semiconductors 2022年第8期43卷 24-32页

作者： Shanshan Chen Yongyue Zhang Xiaorong Hong jiafang li Key Laboratory for Microstructural Material Physics of Hebei Province School of ScienceYanshan UniversityQinhuangdao 066004China Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(Ministry of Education) Beijing Key Laboratory of Nanophotonics&Ultrafine Optoelectronic Systemsand School of PhysicsBeijing Institute of TechnologyBeijing 100081China Yangtze Delta Region Academy of Beijing Institute of Technology Jiaxing 314019China

Micro-optical electromechanical systems(MOEMS)combine the merits of micro-electromechanical systems(MEMS)and micro-optics to enable unique optical functions for a wide range of advanced *** simple external electromechanical control methods,such as electrostatic,magnetic or thermal effects,Si-based MOEMS can achieve precise dynamic optical *** this paper,we will briefly review the technologies and applications of Si-based *** basic working principles,advantages,general materials and micromachining fabrication technologies are introduced concisely,followed by research progress of advanced Si-based MOEMS devices,including micromirrors/micromirror arrays,micro-spectrometers,and optical/photonic *** to the unique advantages of Si-based MOEMS in spatial light modulation and high-speed signal processing,they have several promising applications in optical communications,digital light processing,and optical ***,future research and development prospects of Si-based MOEMS are discussed.

关键词： MOEMS Si-based micromachining technology micromirror micro-spectrometer optical switches

Optical forces exerted on a graphene-coated dielectric particle by a focused Gaussian beam

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Photonics Research 2016年第2期4卷 65-69页

作者： Yang Yang Zhe Shi jiafang li Zhi-Yuan li Laboratory of Optical Physics Institute of Physics Chinese Academy of Sciences Key Laboratory of Micro-Nano Measurement-Manipulation and Physics (Ministry of Education) Beihang University

In this paper, we derive the analytical expression for the multipole expansion coefficients of scattering and interior fields of a graphene-coated dielectric particle under the illumination of an arbitrary optical beam. By using this arbitrary beam theory, we systematically investigate the optical forces exerted on the graphene-coated particle by a focused Gaussian beam. Via tuning the chemical potential of the graphene, the optical force spectra could be modulated accordingly at resonant excitation. The hybridized whispering gallery mode of the electromagnetic field inside the graphene-coated polystyrene particle is more intensively localized than the pure polystyrene particle, which leads to a weakened morphology-dependent resonance in the optical forces. These investigations could open new perspectives for dynamic engineering of optical manipulations in optical tweezers applications.

关键词： Optical forces exerted on a graphene-coated dielectric particle by a focused Gaussian beam

Variation of Thornthwaite Moisture Index in Hengduan Mountains, China

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Chinese Geographical Science 2016年第5期26卷 687-702页

作者： ZHU Guofeng QIN Dahe TONG Huali liU Yuanfeng li jiafang CHEN Dongdong WANG Kai HU Pengfei College of Geography and Environment Science Northwest Normal University State Key Laboratory of Cryosphere Sciences Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences

The Thornthwaite moisture index, an index of the supply of water （precipitation） in an area relative to the climatic demand for water （potential evapotranspiration）, was used to examine the spatial and temporal variation of drought and to verify the influence of environmental factors on the drought in the Hengduan Mountains, China. Results indicate that the Thornthwaite moisture index in the Hengduan Mountains had been increasing since 1960 with a rate of 0.1938/yr. Annual Thomthwaite moisture index in Hengduan Mountains was between -97.47 and 67.43 and the spatial heterogeneity was obvious in different seasons. Thomthwaite moisture index was high in the north and low in the south, and the monsoon rainfall had a significant impact on its spatial distribution. The tendency rate of Thomthwaite moisture index variation varied in different seasons, and the increasing trends in spring were greater than that in summer and autumn. However, the Thomthwaite moisture index decreased in winter. Thomthwaite moisture index increased greatly in the north and there was a small growth in the south of Hengduan Mountains. The increase of precipitation and decrease of evaporation lead to the increase of Thomthwaite moisture index. Thornthwaite moisture index has strong correlation with vegetation coverage. It can be seen that the correlation between Normalized Difference Vegetation Index （NDVI） and Thomthwaite moisture index was positive in spring and summer, but negative in autumn and winter. Correlation between Thornthwaite moisture index and relative soil relative moisture content was positive in spring, summer and autumn, but negative in winter. The typical mountainous terrain affect the distribu- tion of temperature, precipitation, wind speed and other meteorological factors in this region, and then affect the spatial distribution of Thomthwaite moisture index. The unique ridge-gorge terrain caused the continuity of water-heat distribution from the north to south, and the water-h

关键词： Thomthwaite moisture index Normalized Difference Vegetation Index (NDVI) Kriging interpolation Hengduan Mountains

Adaptable Invisibility Management Using Kirigami-Inspired Transformable Metamaterials

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Research 2021年第1期2021卷 1034-1044页

作者： He-Xiu Xu Mingzhao Wang Guangwei Hu Shaojie Wang Yanzhao Wang Chaohui Wang Yixuan Zeng jiafang li Shuang Zhang Wei Huang Air and Missile Defense College Air Force Engineering UniversityXi’an 710051China Institute of Flexible Electronics Northwestern Polytechnical UniversityXi’an 710072China Department of Electrical and Computer Engineering National University of SingaporeSingaporeSingapore 117583 Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)Beijing 100081China School of Physics Beijing Institute of TechnologyBeijing 100081China Department of Physics University of Hong KongHong KongChina Department of Electronic&Electrical Engineering University of Hong KongHong KongChina

Many real-world applications,including adaptive radar scanning and smart stealth,require reconfigurable multifunctional devices to simultaneously manipulate multiple degrees of freedom of electromagnetic(EM)waves in an on-demand ***,kirigami technique,affording versatile and unconventional structural transformation,has been introduced to endow metamaterials with the capability of controlling EM waves in a reconfigurable ***,we report for a kirigami-inspired sparse meta-architecture,with structural density of 1.5%in terms of the occupation space,for adaptive invisibility based on independent operations of frequency,bandwidth,and *** on the general principle of dipolar management via structural reconstruction of kirigami-inspired meta-architectures,we demonstrate reconfigurable invisibility management with abundant EM functions and a wide tuning range using three enantiomers(A,B,and C)of different geometries characterized by the folding angleβ.Our strategy circumvents issues of limited abilities,narrow tuning range,extreme condition,and high cost raised by available reconfigurable metamaterials,providing a new avenue toward multifunctional smart devices.

关键词： tuning visibility smart

Directly patterned substrate-free plasmonic “nanograter” structures with unusual Fano resonances

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light(Science & Applications) 2015年第1期4卷 295-300页

作者： Ajuan Cui Zhe liu jiafang li Tiehan H Shen Xiaoxiang Xia Zhiyuan li Zhijie Gong Hongqiang li Benli Wang Junjie li Haifang Yang Wuxia li Changzhi Gu Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Joule Physics Laboratory School of ComputingScience and EngineeringUniversity of SalfordSalfordM54WTUK School of Physics Science and Engineering Tongji UniversityShanghai200092China Collaborative Innovation Center of Quantum Matter Beijing200092China

The application of three-dimensional(3D)plasmonic nanostructures as metamaterials(MMs),nano-antennas,and other devices faces challenges in producing metallic nanostructures with easily definable orientations,sophisticated shapes,and smooth surfaces that are operational in the optical regime and ***,we demonstrate that complex 3D nanostructures can be readily achieved with focused-ion-beam irradiation-induced folding and examine the optical characteristics of plasmonic“nanograter”structures that are composed of free-standing Au *** 3D nanostructures exhibit interesting 3D hybridization in current flows and exhibit unusual and well-scalable Fano resonances at wavelengths ranging from 1.6 to 6.4 *** the introduction of liquids of various refractive indices to the structures,a strong dependence of the Fano resonance is observed,with spectral sensitivities of 1400 nm and 2040 nm per refractive index unit under figures of merit of 35.0 and 12.5,respectively,for low-order and high-order resonance in the near-infrared *** work indicates the exciting,increasing relevance of similarly constructed 3D free-standing nanostructures in the research and development of photonics and MMs.

关键词： extraordinary Fano resonances plasmonic nanostructures spatially oriented substrate-free three-dimensional

Rechargeable Metasurfaces for Dynamic Color Display Based on a Compositional and Mechanical Dual-Altered Mechanism

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Research 2023年第1期2022卷 367-377页

作者： Le Yang Xiaorong Hong jiafang li Chang-Yin Ji Yu Han Shanshan Chen Hanqing Jiang Wei-li Song Hao-Sen Chen Daining Fang Beijing Key Laboratory of lightweight Multi-Functional Composite Materials and Structures Institute of Advanced Structure TechnologyBeijing Institute of TechnologyBeijing 100081China Key Lab of Advanced Optoelectronic Quantum Architecture and Measurement(Ministry of Education) Beijing Key Lab of Nanophotonics e Ultrafine Optoelectronic SystemsSchool of PhysicsBeijing Institute of TechnologyBeijing 100081China School of Engineering Westlake UniversityHangzhou 310024China

Dynamic color display can be realized by tunable optical metasurfaces based on the compositional or structural ***,it is still a challenge to realize the efficient modulation by a single-field ***,we report a novel compositional and mechanical dual-altered rechargeable metasurface for reversible and broadband optical reconfiguration in both visible and near-infrared wavelength *** employing a simple fabrication and integration strategy,the continuous optical reconfiguration is manipulated through an electro-chemo-mechanical coupled process in a lithium ion battery,where lithiation and delithiation processes occur dynamically under a low electric voltage(ling the phase transformation from Si to li,Si,both structural morphology and optical scattering could be rapidly and dramatically tailored within 30s,exhibiting high-contrast colorization and decolorization in a large-area nanofilm and showing long cyclic *** wide-angle reconfiguration of high-resolution structural colors in bowtie metasurfaces is demonstrated from anomalous *** results provide a multifield mechanism for reconfigurable photonic devices,and the new platform can be introduced to the multidimensional information encryption and storage.

关键词： scattering figuration Dynamic

Nano-Kirigami： A Nanoscale＂Paper-cut＂ Developed For 3D Intelligent Nanofabrication

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Bulletin of the Chinese Academy of Sciences 2018年第2期32卷 105-106页

作者： li jiafang institute of physics cas

Kirigami is one of the most traditional Chinese arts(named"paper-cuts"or"jianzhi")that has been widely used in window decorations,gift cards,festivals,ceremonies,*** cutting and folding flat objects into 3D shapes,the knowledge of kirigami has recently aroused tremendous interests in both sciences and technologies,including deployable designs of solar arrays,biomedical devices and micro-/

关键词：中国科学技术发展现状 3D智能技术

Microscopic and macroscopic manipulation of gold nanorod and its hybrid nanostructures[Invited]

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Photonics Research 2013年第1期1卷 28-41页

作者： jiafang li Honglian Guo Zhi-Yuan li Laboratory of Optical Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

Gold nanorods(GNRs)have potential applications ranging from biomedical sciences and emerging nanophoton*** this paper,we will review some of our recent studies on both microscopic and macroscopic manipulation of *** properties of GNR nanoparticles,such as efficient surface plasmon amplifications effects,are in*** stable trapping,transferring,positioning and patterning of GNRs with nonintrusive optical tweezers will be *** beams are further employed to improve the trapping *** the other hand,alignment of GNRs and their hybrid nanostructures will be described by using a film stretch method,which induces the anisotropic and enhanced absorptive nonlinearities from aligned *** and engineering of polarized emission from aligned hybrid GNRs will be further demonstrated,with relative excitation–emission efficiency significantly *** works presented in this review show that optical tweezers possess great potential in microscopic manipulation of metal nanoparticles and macroscopic alignment of anisotropic nanoparticles could help the macroscopic samples to flexibly represent the plasmonic properties of single nanoparticles for fast,cheap,and high-yield applications.

关键词： nanoparticles macroscopic trapping