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3D nano-printed geometric phase metasurfaces for generating accelerating beams with complex amplitude manipulation

Science China(Physics,Mechanics & Astronomy) 2024年第6期67卷 86-95页

作者： Tianchen Tang Saima Kanwal Yongzheng Lu Yuelong Li Shuangbao Wu Lei Chen Ziheng Qian Zhouyu Xie Jing Wen Dawei Zhang Research Center of Optical Instrument and System Ministry of Education and Shanghai Key Lab of Modern Optical SystemUniversity of Shanghai for Science and TechnologyShanghai 200093China

Metasurface,a forefront in emerging optical devices,has demonstrated remarkable potential for complex amplitude manipulation of light ***,prevailing approaches face challenges in spatial resolution and complexities associated with integrating dynamic phases,impeding the simplified design and reproducible fabrication of ***,we introduce an innovative approach for complex amplitude modulation within 3D nano-printed geometric phase *** approach enables the generation of self-accelerating beams by encoding amplitude through phase-only manipulation,achieving high spatial ***,this method circumvents the conventional need to adjust the geometric parameters of metasurface unit structures for amplitude manipulation,offering a streamlined and efficient route for design and fabrication *** novel methodology holds promise for expedited and low-cost manufacturing of complex amplitude manipulation metasurfaces.

关键词： metasurface complex amplitude manipulation geometric phase 3D nano-printing Airy beam accelerating parabolic beam

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Unveiling of Terahertz Emission from Ultrafast Demagnetization and the Anomalous Hall Effect in a Single Ferromagnetic Film

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Chinese Physics Letters 2024年第4期41卷 45-50页

作者：蓝志强李章顺徐浩然刘凡金钻明彭滟朱亦鸣 Terahertz Technology Innovation Research Institute Terahertz Spectrum and Imaging Technology Cooperative Innovation CenterShanghai Key Lab of Modern Optical SystemUniversity of Shanghai for Science and TechnologyShanghai 200093China

Using THz emission spectroscopy,we investigate the elementary spin dynamics in ferromagnetic single-layer Fe on a sub-picosecond *** demonstrate that THz radiation changes its polarity with reversal of the magnetization applied by the external magnetic *** addition,it is found that the sign of THz polarity excited from different sides is defined by the thickness of the Fe layer and Fe/dielectric *** on the thickness and symmetry dependences of THz emission,we experimentally distinguish between the two major contributions:ultrafast demagnetization and the anomalous Hall *** experimental results not only enrich understanding of THz electromagnetic generation induced by femtosecond laser pulses but also provide a practical way to access laser-induced ultrafast spin dynamics in magnetic structures.

关键词： magnetic magnetization polarity

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Effect of SiO_(2)introduction on luminescence properties of LuAG:Mn^(2+) phosphors

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Journal of Rare Earths 2022年第2期40卷 253-259,I0003页

作者： Chenyao Zhao Hui Lin Dawei Zhang Ruijin Hong Shengming Zhou Engineering Research Center of Optical Instrument and System Ministry of Education and Shanghai Key Lab of Modem Optical SystemUniversity of Shanghai for Science and TechnologyShanghai 200093China Laboratory of Micro-Nano Optoelectronic Materials and Devices Key Laboratory of Materials for High-Power LaserShanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China

Mn^(2+)doped LuAG phosphors with different contents of Si^(4+)ions were synthesized via the solid-state reaction method and the effects of Si^(4+)doping on the crystal structure and luminescence properties of phosphors were *** patterns of all phosphors exhibit a pure phase but with different extents of *** to the 4 T1→6 A1 transition of Mn^(2+),the LuAG:Mn^(2+),Si^(4+)phosphors exhibit a broad emission band with an emission peak at 582 ***,the introduction of Si^(4+)not only improves the emission intensity but also induces a red-shift with the emission peak from 582 to 612 nm and the spectra broadening with the full width at half maximum value from 64 to 74 nm,which results from the decrease of bond length between O2-anions and Mn^(2+)cations and the re-absorption of Mn^(2+)-Mn^(2+)*** content of Si^(4+)replacement can weaken thermal quenching of Mn^(2+).Thus,via regulating the content of Si,the Mn^(2+),Si^(4+)co-doped LuAG phosphor with low correlated color temperature is a candidate for warm wLEDs.

关键词： Lu_(3)Al_(5)O_(12) Mn^(2+)luminescence Warm white LEDs Transition metal luminescence Rare earths

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Electrospun Bi-decorated Bi_(x)Ti_(y)O_(z)/TiO_(2) flexible carbon nanofibers and their applications on degradating of organic pollutants under solar radiation

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Journal of Materials Science & Technology 2023年第19期150卷 114-123页

作者： Liangtao Yao Changpo Sun Hui Lin Guisheng Li Zichao Lian Ruixin Song Songlin Zhuang Dawei Zhang Engineering Research Center of Optical Instrument and System Ministry of Education and Shanghai Key Lab of Modern Optical SystemUniversity of Shanghai for Science and TechnologyShanghai 200093China Standards and Quality Center of National Food and Strategic Reserves Administration Beijing 100834China Department of Chemistry College of ScienceUniversity of Shanghai for Science and TechnologyShanghai 200093China

Presently,photocatalytic degradation has emerged as an attractive and efficient technology for wastewater *** order to avoid hurdles,such as difficulty in the suspended photocatalyst segregation from the aqueous system and low reutilization rate,the strategy of immobilizing photocatalysts with electro-spun fibers has been widely ***,those methods usually require multi-step preparation and complex *** this,a novel metallic Bi-decorated flexible multiphase Bi_(x)Ti_(y)O_(z)/TiO_(2) electrospun carbon nanofibers(Bi/Bi_(x)Ti_(y)O_(z)-TiO_(2)/CNFs)with high photocatalytic efficiency,good mechanical property,good stability,easy separation,and recovery were synthesized via a one-step approach of pre-oxidation and carbonization *** as-prepared Bi/Bi_(x)Ti_(y)O_(z)-TiO_(2)/CNFs with multiphase Bi_(x)Ti_(y)O_(z),anatase TiO_(2),and metallic Bi particles embedded not only enhance the harvest of light but also pro-vide more separation paths for photogenerated carriers,which improve photocatalytic efficiency *** Bi/Bi_(x)Ti_(y)O_(z)-TiO_(2)/CNFs(S3)exhibited excellent photocatalytic performance and the degradation rate of 10 mg L^(-1) Rhodamine B(RhB)was up to 97%in only 30 min under simulated sunlight ***,S3 exhibited stable activity during 5 cycles of experiments since the degradation rates remained at about 97%in 30 *** mechanism of degradation of RhB by Bi/Bi_(x)Ti_(y)O_(z)-TiO_(2)/CNFs in the photocat-alytic process was also proposed based on active species trapping *** work in this paper shows that Bi/Bi_(x)Ti_(y)O_(z)-TiO_(2)/CNFs are easy to prepare and have high photocatalytic ability and stability,thereby offering a new strategy in catalyst immobilization and wastewater treatment.

关键词： Electrospun nanofibers Photocatalyst Flexible

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Non-volatile and multistate terahertz response in semi-floating-gate graphene field-effect transistors

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Optics Express 2025年第11期33卷 22196-22207页

作者： Fu, Jingjing Xu, Mengjian Cai, Miao Yao, Yifan Lei, Shuo Cai, Wen Cai, Yating He, Fei Zhang, Shichen Zhang, Xunling Hou, Shicong Tang, Shun Wang, Qingyang Guo, Xuguang Zhu, Yiming Shanghai Key Lab of Modern Optical Systems Terahertz Technology Innovation Research Institute Engineering Research Center of Optical Instrument and System Ministry of Education University of Shanghai for Science and Technology Shanghai200093 China Shanghai Institute of Intelligent Science and Technology Tongji University Shanghai200092 China

Two-dimensional (2D) material photodetector based on semi-floating gate (SFG) structure is expected to achieve multiple functions of information sensing, storage, and processing in a single device. Here, we demonstrated a terahertz (THz) detector based on the graphene/h-BN/graphene SFG structure. The device exhibits an excellent memory behavior and a gate-controlled non-volatile and multistate photothermoelectric (PTE) THz response. A theoretical model is established to systematically investigate the memory and PTE response characteristics, and the numerical results are well consistent with the experimental results. Our research provides valuable insights into the complex optoelectronic behavior of 2D material Semi-Floating-Gate Graphene Field-Effect Transistors (SFG-FETs) and paves the way for the realization of multifunctional photodetectors based on SFG-FET structures. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Photodetectors

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Ultra-wideband terahertz fingerprint enhancement sensing and inversion model supported by single-pixel reconfigurable graphene metasurface

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PhotoniX 2024年第1期5卷 547-568页

作者： Bingwei Liu Yan Peng YuFan Hao Yiming Zhu Shengjiang Chang Songlin Zhuang Terahertz Technology Innovation Research Institute Terahertz Spectrum and Imaging Technology Cooperative Innovation CenterShanghai Key Lab of Modern Optical SystemUniversity of Shanghai for Science and TechnologyShanghai 200093China Institute of Modern Optics Nankai UniversityTianjin 300350China

The molecular fingerprint sensing technology based on metasurface has unique attraction in the biomedical ***,in the terahertz(THz)band,existing metasurface designs based on multi-pixel or angle multiplexing usually require more analyte amount or possess a narrower tuning ***,we propose a novel single-pixel graphene *** on the synchronous voltage tuning,this metasurface enables ultra-wideband(1.5 THz)fingerprint enhancement sensing of trace analytes,including chiral optical isomers,with a limit of detection(LoD)≤0.64μg/*** enhancement of the fingerprint signal(17.4 dB)originates from the electromagnetically induced transparency(EIT)effect excited by the metasurface,and the ideal overlap between the light field constrained by single-layer graphene(SLG)and ultra-thin ***,due to the unique nonlinear enhancement mechanism in graphene tuning,the absorption envelope distortion is *** solve this problem,a universal fingerprint spectrum inversion model is developed for the first time,and the restoration of standard fingerprints reaches Rmax 2≥*** addition,the asynchronous voltage tuning of the metasurface provides an opportunity for realizing the dynamic reconfiguration of EIT resonance and the slow light modulation in the broadband *** work builds a bridge for ultra-wideband THz fingerprint sensing of trace analytes,and has potential applications in active spatial light modulators,slow light devices and dynamic imaging equipments.

关键词： Graphene metasurface Chiral molecules Terahertz fingerprint Electromagnetically induced transparency Spectrum inversion model

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A four-dimensional model for the information storage/output of life

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Nano Research 2023年第2期16卷 2630-2634页

作者： Bo Song Lei Jiang Key Laboratory of Optical Technology and Instrument for Medicine Ministry of EducationShanghai Key Lab of Modern Optical SystemSchool of Optical-Electrical Computer EngineeringUniversity of Shanghai for Science and TechnologyShanghai 200093China Key Laboratory of Bio-inspired Materials and Interfacial Science Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China School of Future Technology University of Chinese Academy of SciencesBeijing 100049China

A large amount of progress has achieved in neuroscience,however,there is still a lack of reasonable model for the storage/output(S/O)of life *** cyclical motion of cardio-and pulmonary-myocyte is a typical process of the life information S/O,while the opening and closing sites of Ca^(2+)ion channels during the motion can form a genetically programmed time-dependent three-dimensional(3D)*** phenomena indicate a strong correlation of the information S/O model of these myocytes with the time-sequence 3D ***,based on the time-dependent Ca^(2+)fluorescence imaging during the motion of cardio-and pulmonary-myocyte,here we suggest a four-dimensional(4D)code of information S/O model in cell and nervous *** from the fact of pulmonary myocyte motion able to be controlled by brain,it is deduced that the 4D code in brain has a role of controlling muscles through a pathway of the central nervous system,peripheral nervous system,neuromuscular junction,and muscle *** addition,we also suggested the 4D code of non-innate skill that can be programmed by the learning/training of a long time(~3 years),such as walking,writing,painting,sports,speech,singing,and ***,this 4D S/O model is reasonable for the ultralow energy consumption of life information transmission.

关键词： four-dimensional(4D)storage/output model life information cell nervous system

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LDSeq: Latent Diffusion Models for Sequence to Sequence Text Generation 7

LDSeq: Latent Diffusion Models for Sequence to Sequence Text...

引用

7th International Conference on Computer Science and Artificial Intelligence, CSAI 2023

作者： Ding, Yizhou Tian, Jidong Mei, Shanxing Zhou, Yifan Dong, Yuwu He, Hao Hu, Weisheng State Key Lab of Advanced Optical Communication System and Network Shanghai Jiao Tong University Shanghai China

ISBN: (纸本)9798400708688

Diffusion models have demonstrated remarkable success in generating continuous data, such as images and audios. Previous studies on text generation employing continuous diffusion models have revealed the potential of the diffusion framework. However, challenges like embedding collapse persist, limiting the overall generation performance. In this paper we introduce LDSeq, a latent diffusion framework employing a two-stage training procedure for sequence-to-sequence text generation. In the proposed framework, we first train a Variational Auto-Encoder (VAE) on downstream datasets to compress the target text of samples into a continuous latent space, and then we train a conditional latent diffusion model in the fixed continuous latent space, where the latent vectors are iteratively sampled conditioned on the input source text. The disjoint training stages prevent the collapse of diffusion space. Experimental results on paraphrase generation and text summarization datasets show that LDSeq achieves comparable or superior performance in comparison to AR and NAR baselines while requiring lower training cost. Furthermore, We discuss some potential future directions for enhancing diffusion models in the text generation domain. © 2023 ACM.

关键词： Diffusion

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Ontology-Semantic Alignment On Contrastive Video-Language Model for Multimodel Video Retrieval Task 7

Ontology-Semantic Alignment On Contrastive Video-Language Mo...

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7th International Conference on Computer Science and Artificial Intelligence, CSAI 2023

作者： Zhou, Yifan Ding, Yizhou Dong, Yuwu He, Hao Shanghai Jiao Tong University State Key Lab of Advanced Optical Communication System and Network Shanghai China

ISBN: (纸本)9798400708688

Contrastive Learning-based models have shown impressive performance in text-image retrieval tasks. However, when applied in video retrieval, traditional contrastive learning strategies have faced challenges in achieving satisfactory results due to redundancy of video contents. We discern several potential reasons: (1)Current methodologies sometimes overlook the significant information imbalance between videos and query text, specifically neglecting the in-depth textual representation of the content within the videos. (2) Current video matching methodologies typically focus on cross-model alignment at general entity similarity level, without specific consideration for how entity pair preferences and similarity properties affect the task at hand. (3) Previous vectorized retrieval based on video content features have been somewhat flawed. They primarily focused on aligning overall features without having an video content tags feature for meaningful feature discrimination. Considering the shortcomings identified in the mentioned three aspects, we propose an ontology semantic labels augments retrieval model and introduce a method to integrate video ontology semantic labels into the contrastive learning framework. In particular, we have developed ontology semantic descriptions about entities encompassing both human figures and textual elements within the videos. Subsequently, we conducted training and testing on the CMIVQA dataset to assess the performance of our approach. The experimental results show that employing fine-grained ontology labels as sample pairs for contrastive learning leads to an increased level of precision in video retrieval tasks. © 2023 ACM.

关键词： Ontology

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Ultrafast laser state active controlling based on anisotropic quasi-1D material

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Light(Science & Applications) 2024年第4期13卷 717-726页

作者： Zixin Yang Qiang Yu Jian Wu Haiqin Deng Yan Zhang Wenchao Wang Tianhao Xian Luyi Huang Junrong Zhang Shuai Yuan Jinyong Leng Li Zhan Zongfu Jiang Junyong Wang Kai Zhang Pu Zhou College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China. Nanhu Laser Laboratory National University of Defense TechnologyChangsha 410073China. i-Lab&Key Laboratory of Nanodevices and Applications&Key Laboratory of Nanophotonic Materials and Devices Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China. School of Applied and Engineering Physics Cornell UniversityIthacaNY 14853USA. State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China. Shanghai Key Lab of Modern Optical System University of Shanghai for Science and TechnologyShanghai 200093China

Laser state active controlling is challenging under the influence of inherent loss and other nonlinear effects in ultrafast *** an extension of degree of freedom in optical devices based on low-dimensional materials may be a way ***,the anisotropic quasi-one-dimensional layered material Ta2PdS6 was utilized as a saturable absorber to modulate the nonlinear parameters effectively in an ultrafast system by polarization-dependent *** polarization-sensitive nonlinear optical response facilitates the Ta2PdS6-based mode-lock laser to sustain two types of laser states,i.e.,conventional soliton and noise-like *** laser state was switchable in the single fiber laser with a mechanism revealed by numerical *** coding was further demonstrated in this platform by employing the laser as a codable light *** work proposed an approach for ultrafast laser state active controlling with low-dimensional material,which offers a new avenue for constructing tunable on-fiber devices.

关键词： polarization fiber controlling

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