检索结果-内蒙古大学图书馆

Chirp-free hundred-picosecond pulse fiber laser based on carbon nanotubes mode-locker

Optics Express 2025年第7期33卷 14850-14857页

作者： Li, Weixi Jiang, Kailin Dai, Lilong Huang, Qianqian Zou, Meng Luo, Siyu Chen, Siyu Song, Yingxiong Liu, Yunqi Yan, Zhijun Mou, Chengbo Key Laboratory of Specialty Fiber Optics and Optical Access Networks Shanghai Institute for Advanced Communication and Data Science Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication Shanghai University Shanghai200444 China School of Optical and Electronic Information National Engineering Laboratory for Next Generation Internet Access System Huazhong University of Science and Technology Wuhan430074 China

We demonstrate a narrow bandwidth passively erbium-doped mode-locked fiber laser based on single-wall carbon nanotubes (SWCNTs). The center wavelength is 1546.61 nm. The strong filtering effect and low saturable absorber (SA) modulation depth provide advantages for a long pulse duration of 323 ps. An overall spectral bandwidth of 1.3 GHz (0.01 nm) is measured by the optical heterodyne method, representing the narrowest spectral width based on SWCNT under a single filter structure. The obtained spectral width is very close to the transform-limited bandwidth of 8 pm, indicating that the pulse is chirp-free. Meanwhile, the generation of beat signals reveals the strong coherence between pulses. The repetition frequency of the laser is 7.8 MHz, and the number of longitudinal mode locks is only 166, which is the minimum number of longitudinal mode-locking in passively mode-locked laser based on material SA. At the same time, numerical simulations further support our experimental results and reveal the pulse evolution, providing evidence that SA and filter are the key factors in the generation of chirp-free long pulse. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Saturable absorbers

来源：评论

学校读者我要写书评

暂无评论

Lead-free perovskite Cs_(2)AgBiBr_(6)photodetector detecting NIR light driven by titanium nitride plasmonic hot holes

引用

Photonics Research 2024年第3期12卷 522-533页

作者： ZIJIAN LIU YUYING XI WENBO ZENG TING JI WENYAN WANG SITONG GUO LINLIN SHI RONG WEN YANXIA CUI GUOHUI LI College of Physics College of Electronic Information and Optical EngineeringKey Laboratory of Advanced Transducers and Intelligent Control System of Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030032China

Lead-free perovskite Cs_(2)AgBiBr_(6)manifests great potential in developing high-performance,environmentally friendly,solution-processable photodetectors(PDs).However,due to the relatively large energy bandgap,the spectrum responses of Cs_(2)AgBiBr_(6)PDs are limited to the ultraviolet and visible region with wavelengths shorter than 560 *** this work,a broadband Cs_(2)AgBiBr_(6)PD covering the ultraviolet,visible,and near infrared(NIR)range is demonstrated by incorporating titanium nitride(TiN)nanoparticles that are prepared with the assistance of self-assembled polystyrene sphere *** addition,an atomically thick Al2O3layer is introduced at the interface between the Cs_(2)AgBiBr_(6)film and TiN nanoparticles to alleviate the dark current deterioration caused by nanoparticle *** a result,beyond the spectrum range where Cs_(2)AgBiBr_(6)absorbs light,the external quantum efficiency(EQE)of the TiN nanoparticle incorporated Cs_(2)AgBiBr_(6)PD is enhanced significantly compared with that of the control,displaying enhancement factors as high as 2000 over a broadband NIR wavelength *** demonstrated enhancement in EQE arises from the photocurrent contribution of plasmonic hot holes injected from TiN nanoparticles into Cs_(2)AgBiBr_(6).This work promotes the development of broadband solution-processable perovskite PDs,providing a promising strategy for realizing photodetection in the NIR region.

关键词： perovskite titanium ultraviolet

来源：评论

学校读者我要写书评

暂无评论

Boosting external quantum efficiency of a WSe_(2) photodetector across visible and NIR spectra through harnessing plasmonic hot electrons

引用

Photonics Research 2024年第9期12卷 1846-1857页

作者： LINLIN SHI ZIYANG ZHAO JINYANG JIAO TING JI WENYAN WANG YANXIA CUI GUOHUI LI College of Electronic Information and Optical Engineering Key Laboratory of Interface Science and Engineering in Advanced Materials of Ministry of EducationKey Laboratory of Advanced Transducers and Intelligent Control System of Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030032China

The layered two-dimensional material tungsten diselenide(WSe_(2))has triggered tremendous interests in the field of optoelectronic devices due to its exceptional carrier transport ***,the limited absorption of WSe_(2) in the near infrared(NIR)band poses a challenge for the application of WSe_(2) photodetectors in night vision,telecommunication,***,the enhanced performance of the WSe_(2) photodetector is demonstrated through the incorporation of titanium nitride nanoparticles(TiN NPs),complemented by an atomically-thick Al_(2)O_(3) layer that aids in suppressing the dark *** is demonstrated that TiN NPs can dramatically enhance the absorption of light in the proposed WSe_(2) photodetector in the NIR *** enhancement boosts photocurrent responses through the generation of plasmonic hot electrons,leading to external quantum efficiency(EQE)enhancement factors of 379.66%at 850 nm and 178.47%at 1550 *** work presents,for the first time,to our knowledge,that the WSe_(2) photodetector is capable of detecting broadband light spanning from ultraviolet to the telecommunication range,all achieved without the reliance on additional semiconductor *** achievement opens avenues for the advancement of cost-effective NIR photodetectors.

关键词： quantum titanium exceptional

来源：评论

学校读者我要写书评

暂无评论

Bacteria Detection system for Solid Specimen Based on Electrical Measurement 59

Bacteria Detection System for Solid Specimen Based on Electr...

引用

59th International Universities Power engineering Conference, UPEC 2024

作者： Terabe, Kokona Ikeda, Yoki Nagaoka, Naoto Advanced Course of Electrical and Electronic Engineering National Institute of Technology Nara College Nara Yamatokoriyama Japan National Institute of Technology Nara College Dept. of Electrical Engineering Nara Yamatokoriyama Japan International Infrastructure System Research Center Doshisha University Kyotanabe Kyoto Japan

ISBN: (纸本)9798350379730

Colony counting method is the most popular method for bacterial assay. The method requires a long incubation time and complex operations based on biological knowledge. Since the assay result is needed as soon as possible in medical and food manufacturing fields, the incubation time is too long for sanitary inspection. Electrical assay methods, such as the dielectrophoretic impedance measurement (DEPIM) method, have been investigated for the fast and easy assay approach. The authors proposed an electrical assay method using impedance measurement in an accompanying paper. However, its accuracy in a low-frequency region should be improved. This paper investigates a method to determine the presence of bacteria by resistance measurement and proposes a practical bacteria detection system that applies a grounding characteristic measurement technique. A parametric measurement unit (PMU) initially developed for semiconductor evaluation is adopted for the measurement. The PMU also works as a D.C. power supply, and a microcomputer controls the PMU. The measured result using the proposed system clearly shows the difference between the presence and absence of Escherichia coli. The result means the system can be used as a speedy and convenient assay method in sanitary inspection. © 2024 IEEE.

关键词： Escherichia coli

来源：评论

学校读者我要写书评

暂无评论

Injecting spectral indices to transferable convolutional neural network under imbalanced and noisy labels for Landsat image classification

引用

International Journal of Digital Earth 2022年第1期15卷 437-462页

作者： Xuemei Zhao Jun Wu Haijian Wang Xingyu Gao Longlong Zhao School of Electronic Engineering and Automation Guilin University of Electronic TechnologyGuangxiPeople's Republic of China Guangxi Key Laboratory of Manufacturing System & Advanced Manufacturing Technology School of Mechanical and Electrical EngineeringGuilin University of Electronic TechnologyGuangxiPeople's Republic of China Center for Geospatial Information Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesBeijingPeople's Republic of China

Stable and continuous remote sensing land-cover mapping is important for agriculture,ecosystems,and land *** neural networks(CNNs)are promising methods for achieving this ***,the large number of high-quality training samples required to train a CNN is difficult to *** practice,imbalanced and noisy labels originating from existing land-cover maps can be used as *** have shown that the inconsistency in the training samples has a significant impact on the performance of the *** overcome this drawback,a method is proposed to inject highly consistent information into the network,to learn general and transferable features to alleviate the impact of imperfect training *** indices are important features that can provide consistent *** indices can be fused with CNN feature maps which utilize information entropy to choose the most appropriate CNN layer,to compensate for the inconsistency caused by the imbalanced,noisy *** proposed transferable CNN,tested with imbalanced and noisy labels for inter-regional Landsat time-series,not only is superior in terms of accuracy for land-cover mapping but also demonstrates excellent transferability between regions in both time series and cross-regional Landsat image classification.

关键词： Landsat image classification imbalanced and noisy label convolutional neural network(CNN) transferability feature fusion information entropy

来源：评论

学校读者我要写书评

暂无评论

A Lightweight Network for Detecting Small Targets in the Air 6th

A Lightweight Network for Detecting Small Targets in the Air

引用

6th International Conference on Innovative Computing, IC 2023

作者： Li, Jiaxin Li, Hui Yong, Ting Hou, Xingyu Institute of System Engineering Nanjing China The Institute of North Electronic Equipment Beijing China National Key Laboratory of Science and Technology on Information System Security Beijing China Zhengzhou Xinda Institute of Advanced Technology Zhengzhou China

ISBN: (纸本)9789819922864

Fast and accurate detection and identification of small airborne targets are of great importance, to security in the air. Unmanned aerial vehicle detection algorithms are mostly deployed on edge devices, and a yolov5-based aerial target lightweight detector is proposed by compressing channels and network cropping for the limited resource characteristics on edge devices. Firstly, the shallow cross-stage partial module is extended and optimized when designing the feature ex-traction network to maximize the use of shallow features. Secondly, the network is cropped to reduce the number of down-sampling, which makes the computation faster. Finally, the pyramid network used for feature fusion is simplified by modifying from two upsampling operations and two downsampling operations to only one upsampling operation. On the homemade dataset, the proposed Yolo-mini achieves 94.44% mean average accuracy on the test set and the Giga floating-point operations per second of the model is only 3.2, which achieves a better balance of accuracy and computation compared to other lightweight algorithms. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Object detection

来源：评论

学校读者我要写书评

暂无评论

Research on Metamaterial Technology for Microwave Wireless Power Transfer

Research on Metamaterial Technology for Microwave Wireless P...

引用

2024 International Symposium on Antennas and Propagation, ISAP 2024

作者： Yamamoto, Tsunayuki Kobashi, Takeo Maruyama, Tamami Department of Integrated Science and Technology National Institute of Technology Tsuyama College Tsuyama-shi Japan Advanced Electronics and Information System Engineering Course National Institute of Technology Tsuyama College Tsuyama-shi Japan Department of Production Systems Engineering Institute of Technology Hakodate College Hakodate-shi Japan

ISBN: (纸本)9798350364774

In this paper, two technologies of metamaterial for microwave wireless power transfer are shown. One is a zeroth-order resonance for a microwave snow melting system, and another one is a focusing reflector for realizing of a highly efficient wireless power transfer space. A zeroth-order resonance leads a uniformed microwave heating and a flexibility of feeding in a snow melting system. Focusing reflector can make some electromagnetic hot and null points in a space. These are expected to be required technologies for highly efficient wireless power transfer. © 2024 IEEE.

关键词： Reflection

来源：评论

学校读者我要写书评

暂无评论

Indefinite metacavities coupled to a mirror:bound states in the continuum with anomalous resonance scaling

引用

Photonics Research 2024年第3期12卷 598-607页

作者： QIANG ZHANG PEIXIANG LI ZHIYUAN GU SHAODING LIU ZEJUN DUAN College of Electronic Information and Optical Engineering Taiyuan University of TechnologyTaiyuan 030024China Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024China

Indefinite metacavities(IMCs)made of hyperbolic metamaterials show great advantages in terms of extremely small mode volume due to large wave vectors endowed by the unique hyperbolic ***,quality(Q)factors of IMCs are limited by Ohmic loss of metals and radiative loss of leaked *** the fact that Ohmic loss of metals is inevitable in IMCs,the radiative loss can be further suppressed by leakage *** we propose a mirror coupled IMC structure which is able to operate at Fabry–Pérot bound states in the continuum(BICs)while the hyperbolic nature of IMCs is *** the BIC point,the radiative loss of magnetic dipolar cavity modes in IMCs is completely absent,resulting in a considerably increased Q factor(>90).Deviating from the BIC point,perfect absorption bands(>0.99)along with a strong near-field intensity enhancement(>1.8×10^(4))appear when the condition of critical coupling is almost *** proposed BICs are robust to the geometry and material composition of IMCs and anomalous scaling law of resonance is verified during the tuning of optical *** also demonstrate that the Purcell effect of the structure can be significantly improved under BIC and quasi-BIC regimes due to the further enhanced Q factor to mode volume *** results provide a new train of thought to design ultra-small optical nanocavities that may find many applications benefitting from strong light–matter interactions.

关键词： hyperbolic mirror definite

来源：评论

学校读者我要写书评

暂无评论

Brillouin Frequency Shift Extraction for BOTDA Based on Gramian Angular Fields 4

Brillouin Frequency Shift Extraction for BOTDA Based on Gram...

引用

4th International Computational Imaging Conference, CITA 2024

作者： Zhu, Borong Zhang, Zhihao Qian, Yuhao Ma, Xiaole Wang, Liang Yu, Kuanglu Beijing Key Laboratory of Advanced Information Science and Network Technology Beijing100044 China Institute of Information Science School of Computer and Information Technology Beijing Jiaotong University Beijing100044 China National Engineering Laboratory for Next Generation Internet Access System School of Optics and Electronic Information Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9781510688834

To accurately extract Brillouin frequency shift of BOTDA with large sweeping step sizes, a novel structure of GAFCNN is proposed, combining time series coding with convolutional neural networks. The experimental data validation results demonstrate that the GAFCNN is capable of obtaining more accurate results under large sweep steps and low signal-to-noise ratios (SNRs) than other current methods. © 2025 SPIE.

关键词： Convolutional neural networks

来源：评论

学校读者我要写书评

暂无评论

Photovoltaic (PV) Watering Plant system With Internet of Things (IoT) 8

Photovoltaic (PV) Watering Plant System With Internet of Thi...

引用

8th IEEE International Conference on Smart Instrumentation, Measurement and Applications, ICSIMA 2022

作者： A'Ffan, M.I. Arbai, A.A. Pazil, A.F.Md. SEGi University Centre for Advanced Electrical and Electronic System Faculty of Engineering Built Environment and Information Technology Petaling Jaya Malaysia

ISBN: (数字)9781665488006

ISBN: (纸本)9781665488006

This paper presents the design of Photovoltaic (PV) watering plant system with Internet of Things (IoT) incorporated with soil moisture and air humidity for hydroponic plants namely water spinach, red spinach and mustard green plant. The input data of the soil moisture and humidity sensors would trigger the water pump in pumping water from the water tank to the plant when the sensors input data reaches below the threshold value and display the data onto Blynk application for monitoring purposes. The power measurement of PV system is implemented by measuring the voltage, current and power produced from the solar panel. Results show that the each soil moisture sensor is able to measure the moisture of each hydroponic plant with an average reading of 80% while the humidity sensor with the reading of 57.25% and 50.25% for both humidity sensor positioned on left and right respectively. This PV system using INA219 sensor was also able to perform the measurement while the solar panel is charging the battery. The proposed system indicates that the plant can be grown without the need of watering the plant physically which eases the workforce in modern agriculture. © 2022 IEEE.

关键词： Hydroponics

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：