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Suppression of inner energy dissipation in Yb-doped NaErF_(4)upconversion nanocrystals through an energy cycling strategy

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Journal of Rare Earths 2023年第7期41卷 975-980,I0001页

作者： Yunfeng Bai Xiaoxi Liu Shaojian Zhang Haili Jiang Lu Liu Isam Ud Din Jianzhong Zhang Key Laboratory of Micro Nano Optoelectronic Devices and Intelligent Perception Systems School of Electronic Information and EngineeringYangtze Normal UniversityChongqing 408100China College of Physics and Optoelectronic Engineering Harbin Engineering UniversityHarbin 150001China

Suppression of the inner energy dissipation,related to the lattice phonons and inner defects,in lanthanide doped upco nversion luminescent materials remains a formidable ***,we reveal an energy cycling strategy capable of suppressing the inner energy dissipation in lanthanide doped upconversion ***^(3+)ions were introduced in Er^(3+)heavily doped nanocrystals as an energy reservoir to compete with the inner energy *** detailed energy cycling processes between Er^(3+)activator and Yb^(3+)reservoir,responsible for the enhancement of Er^(3+)upconversion intensity,are proposed and further verified on the basis of spectral *** energy cycling strategy,with unique merits like facile and cost-effective preparation as well as broad scope of application,is highly valuable in lanthanide luminescent nano materials.

关键词： Upconversion Er^(3+) 1530 nm excitation Inner energy dissipation Energy cycling Rare earths

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Numerical Investigation of the Spectral Transmission Characteristics of T-shaped Metal nanohole Array 7

Numerical Investigation of the Spectral Transmission Charact...

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7th Global intelligent Industry Conference, GIIC 2024

作者： Li, Hang Zhang, Weiguo Xia, Liangping Dang, Suihu Zhang, Man Du, Chunlei Chongqing Institute of Green and Intelligent Technology Chinese Academy of Sciences Chongqing400714 China Key Laboratory of Micro Nano Optoelectronic Devices and Intelligent Perception Systems Yangtze Normal University Chongqing408100 China

ISBN: (纸本)9781510682986

Surface plasmon polaritons can manipulate and transmit light fields at the nanoscale, offering a wide range of applications in areas such as optoelectronic detection, optical filtering, novel light sources, and biosensing. This study investigated the transmission enhancement characteristics of conventional nanohole arrays through finite-difference time-domain (FDTD) simulations. Additionally, T-shaped metal nanoholes are designed based on the distinct spectral transmission properties of rectangular holes under varying polarized light conditions. Research has demonstrated that compared with their rectangular counterparts, T-shaped metal nanoholes exhibit polarization selectivity and sharper transmission spectra. Furthermore, this study investigated the impact of different components within the structure of T-shaped metal nanoholes on light field modulation by analyzing the electric field distribution. Finally, the influence of various parameters, such as the period, film thickness, and hole size, on the transmission spectrum of T-shaped metal nanoholes is investigated. © 2024 SPIE.

关键词： Light transmission

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A simple method for demodulation of long period fiber grating signals 7

A simple method for demodulation of long period fiber gratin...

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7th Global intelligent Industry Conference, GIIC 2024

作者： Ran, Qiuyue Tang, Yong Bai, Yunfeng Dang, Suihu Key Laboratory of Micro/Nano Optoelectronic Devices and Intelligent Sensing System College of Electronic Information and Engineering Yangtze Normal University Chongqing408100 China

ISBN: (纸本)9781510682986

In this paper, a comprehensive evaluation of a long period fiber grating sensor (LPFGs) based on the transmission intensity at a fixed wavelength is presented. Firstly, the application of spiral long-period fiber grating sensor (H-LPFGs) and tapered long-period fiber grating sensor (T-LPFGs) based on transmission intensity at fixed wavelength is studied, that is, the sensor of torsion, temperature, strain and liquid concentration. The transverse pressure and temperature are then evaluated using this method, and the optical signal is converted into an electrical signal using photoelectric conversion to prepare a complete LPFGs. The temperature sensor has a voltage-temperature sensitivity of -18.7mV / ℃ for a measuring range of 50-150℃ with an accuracy of 0.1℃, and the strain sensor has a voltage-strain sensitivity of 0.248 mV/μΕ for a measuring range of 0-1800μΕ with an accuracy of 1 μΕ. Compared with other long - period fiber grating sensors, the accuracy is improved and the measurement range is wider. The demodulation system of the LPFG sensor based on the transmission intensity ratio measurement method has the advantages of simple operation, wide application range, and low price, so it has a very good application prospect in the LPFG sensor. © 2024 SPIE.

关键词： Fiber Bragg gratings

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Broadband high-efficiency dielectric metalenses based on quasi-continuous nanostrips

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Opto-Electronic Advances 2024年第5期7卷 43-51页

作者： Xiaohu Zhang Qinmiao Chen Dongliang Tang Kaifeng Liu Haimo Zhang Lintong Shi Mengyao He Yongcai Guo Shumin Xiao Key Laboratory of optoelectronic Technology and Systems of the Education Ministry of China Chongqing UniversityChongqing 400044China Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic SystemsHarbin Institute of TechnologyShenzhen 518055China Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education&Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices School of Physics and ElectronicsHunan UniversityChangsha 410082China

Benefiting from the abrupt phase changes within subwavelength thicknesses,metasurfaces have been widely applied for lightweight and compact optical *** broadband and high-efficiency characteristics are highly attractive for the practical implementation of ***,current metasurface devices mostly adopt discrete micro/nano structures,which rarely realize both merits *** this paper,dielectric metasurfaces composed of quasi-continuous nanostrips are proposed to overcome this *** quasi-continuous nanostrips metasurface,a normal focusing metalens and a superoscillatory lens overcoming the diffraction limit are designed and experimentally *** quasi-continuous metadevices can operate in a broadband wavelength ranging from 450 nm to 1000nm and keep a high power *** average efficiency of the fabricated metalens reaches 54.24%,showing a significant improvement compared to the previously reported metalenses with the same *** proposed methodology can be easily extended to design other metadevices with the advantages of broadband and high-efficiency in practical optical systems.

关键词： broadband high-efficiency metalens sub-diffraction quasi-continuous

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intelligent ion gels: Design, performance, and applications

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SmartMat 2024年第1期5卷 38-58页

作者： Naiwei Gao Caofeng Pan Beijing Key Laboratory of Micro‐nano Energy and Sensor CAS Center for Excellence in NanoscienceBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijingChina Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education Center for Stretchable Electronics and Nano SensorsCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhenChina School of Nanoscience and Engineering University of Chinese Academy of SciencesBeijingChina

intelligent ion gels,which possess highly tunable mechanical,electrical,and stimulus‐responsive properties,have emerged as powerful candidates in the field of artificial intelligence,telemedicine,and health *** enrich the functionality of ion gels,it is critical to explore the link between the structure and function of ion *** this review,we provide an overview of the synthesis path and functional derivatives of ion *** conformational relationships of ion gels have been discussed,such as the effect of structure on electrical conductivity as well as sensing *** the perspective of stimulus response,the role of ion gels in areas such as bionic haptics,neural devices,artificial muscles,and intelligent displays has also been *** is possible that smart ion gels will open up a new horizon in the upcoming smart era,especially after the current challenges are resolved.

关键词： chemical structure intelligent electronics ion gels stimulus‐responsive

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Research On Vector Optimization Of Laser Beam Splitter Grating 7

Research On Vector Optimization Of Laser Beam Splitter Grati...

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7th Global intelligent Industry Conference, GIIC 2024

作者： Chen, Guohui Xia, Liangping Wang, Chunyan Dang, Suihu Zhang, Man Yang, Zengbao Qin, Lin Tu, Hong Wang, Shuai Lan, Jingtian Du, Chunlei School of Opto-electronic Engineering Changchun University of Science and Technology Jilin Changchun130022 China Key Laboratory of Micro Nano Optoelectronic Devices and Intelligent Perception Systems Yangtze Normal University Chongqing408100 China Zhuhai Multiscale Optoelectronics Technology Co. Ltd Zhuhai519060 China

ISBN: (纸本)9781510682986

Large angle beam splitter grating is an important optical element but the current design methods are mostly based on the scalar diffraction theory based on Thin Element Approximation approximation, which is difficult to evaluate and calculate well when large angle beam splitting is involved. In this work, a method combining finite difference time domain method with adjoint optimization is proposed. Each iteration only needs two electromagnetic simulations to obtain the gradient distribution of the grating structure region. Using this method, a 1×5 beam splitting grating with a splitting angle of 10 degrees is designed. The final uniformity error is 3.7%, and the total diffraction efficiency is 86.6%. For the two-dimensional splitter, a 3×5 beam splitting grating with a diffraction full angle of 82.4×14 degrees is designed. Under the condition of large angle beam splitting, good uniformity error can still be maintained, and the final uniformity error reaches 23.1%. © 2024 SPIE.

关键词： Laser beams

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Design of Achromatic Metalens Based on Dielectric Metasurface 7

Design of Achromatic Metalens Based on Dielectric Metasurfac...

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7th Global intelligent Industry Conference, GIIC 2024

作者： Zhu, Wenqing Xia, Liangping Zheng, Yang Yang, Zengbao Dang, Suihu Zhang, Man Qin, Lin Du, Chunlei School of Opto-electronic Engineering Changchun University of Science and Technology Jilin Changchun130022 China Key Laboratory of Micro Nano Optoelectronic Devices and Intelligent Perception Systems Yangtze Normal University Chongqing408100 China Zhuhai Multiscale Optoelectronics Technology Co. Ltd Zhuhai519060 China

ISBN: (纸本)9781510682986

Metalenses based on all-dielectric metasurfaces plays an important role in microscopic imaging, machine vision and holographic imaging. Chromatic aberration correction is an important factor that imaging devices. In this work, we propose an transmission achromatic metalens that can operate over a broad band of wavelengths. Based on the principle of phase compensation, the finite-difference time-domain method is used to calculate the wavefront of light for the design of the nano-units in the metalens with eliminating chromatic aberration. In the whole incident spectrum of visible light from 425 nm to 625 nm, The maximum focal shift of the achromatic metalens is about 7.9 %.And the average efficiency of the metalens with a numerical aperture of 0.6 is about 42 % in the wavelength band. © 2024 SPIE.

关键词： Aberrations

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Laser Beam Homogenization and Shaping with Metasurfaces 7

Laser Beam Homogenization and Shaping with Metasurfaces

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7th Global intelligent Industry Conference, GIIC 2024

作者： Li, Yilin Xia, Liangping Dang, Suihu Wang, Chunyan Yang, Zengbao Zhang, Man Qin, Lin Du, Chunlei School of Opto-electronic Engineering Changchun University of Science and Technology Jilin Changchun130022 China Key Laboratory of Micro Nano Optoelectronic Devices and Intelligent Perception Systems Yangtze Normal University Chongqing408100 China Zhuhai Multiscale Optoelectronics Technology Co. Ltd Zhuhai519060 China

ISBN: (纸本)9781510682986

All-dielectric metalens based on the transmission phase was designed, which can uniformly shape a beam with a uniform energy distribution. The problems and related fixes for maintaining beam homogeneity and broad divergence angle simultaneously at 940 nm are explained. In order to solve the problem of wavefront shaping, based on the iterative design principle of complex surfaces such as freeform surfaces, a design scheme to shape the incident wavefront into 80° divergence angle wavefront was proposed. An effective, polarization-independent silicon nanopillar element is built based on the effective dielectric theory, and instead of using the conventional step size selection method, the size of each nanopillar is determined by the phase diameter function, covering the phase tuning from 0 to 2π. © 2024 SPIE.

关键词： Laser beams

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Beam Shaping of Photon Spin Hall Effect based on Single-Layer Dielectric Metasurface 7

Beam Shaping of Photon Spin Hall Effect based on Single-Laye...

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7th Global intelligent Industry Conference, GIIC 2024

作者： Wang, Aobo Xia, Liangping Qin, Lin Wang, Chunyan Dang, Suihu Zhang, Man Yang, Zengbao Du, Chunlei School of Opto-electronic Engineering Changchun University of Science and Technology Jilin Changchun130022 China Key Laboratory of Micro Nano Optoelectronic Devices and Intelligent Perception Systems Yangtze Normal University Chongqing408100 China Zhuhai Multiscale Optoelectronics Technology Co. Ltd Zhuhai519060 China

ISBN: (纸本)9781510682986

The Hall-effect metasurface described in this paper uses a combination of Pancharatnam-Berry (PB) phase and geometric phase to achieve independent phase control of different spin states. According to the established vector diffraction rigorous coupled wave model, the genetic algorithm is used to optimize the phase distribution of two different shaping effects. Then, different shaping functions are integrated into one device through the arrangement of metasurface microstructure units. By manipulating the polarization chirality of the incident light, the focusing and wavefront shaping of different spin-state photons can be realized at the same time, and two coaxially distributed composite spots can be obtained to achieve the purpose of multi-dimensional shaping of far-field spin-state photons. By this method, the central beam with better flat-top effect and the annular spot with larger radius can be obtained. The designed diffraction efficiency is greater than 90% and the spot uniformity is less than 15%. The welded products have both the smooth surface of semiconductor laser welding and the high aspect ratio of fiber laser welding. © 2024 SPIE.

关键词： Laser beam welding

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Stepwise colloidal lithography toward scalable and various planar chiral metamaterials

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Rare Metals 2024年第2期43卷 723-735页

作者： Xiu Yang Yong Liu Fei-Liang Chen Qian-Qi Lin Rohit Chikkaraddy Shan-Shan Huang Shi-Lin Xian Yi-Dong Hou Jing-Lei Du Liang-Ping Xia Chun-Lei Du School of Electronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu610054China School of Optoelectronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu610054China Zhuhai Multiscale Optoelectronics Technology Co. Ltd.Zhuhai915060China Hybrid Materials for Opto-Electronics Group Department of Molecules and MaterialsMESA+Institute for NanotechnologyMolecules Center and Center for Brain-Inspired Nano SystemsFaculty of Science and TechnologyUniversity of Twente7500 AEEnschedeThe Netherlands School of Physics and Astronomy University of BirminghamBirminghamB152TTUK College of Physics Sichuan UniversityChengdu610065China Key Laboratory of Micro Nano Optoelectronic Devices and Intelligent Perception Systems Yangtze Normal UniversityChongqing408100China

Chiral metamaterials(CMs)composed by artificial chiral resonators have attracted great attentions in the recent decades due to their strong chiroptical resonance and identifiable interaction with chiral materials,facilitating practical applications in chiral biosensing,chiral emission,and display ***,the complex geometry of CMs improves the fabrication difficulty and hinders their scalable fabrication for practical applications,especially in the visible and ultraviolet *** potential strategy is the colloidal lithography that enables parallel fabrication for scalable and various planar ***,we demonstrate a stepwise colloidal lithography technique that uses sequential deposition from multiple CMs and expand their variety and *** geometry and optical chirality of building blocks from single deposition are systematically investigated,and their combination enables a significant extension of the range of chiral patterns by multiple-step *** approach resulted in a myriad of complex designs with different characteristic sizes,compositions,and shapes,which are particularly beneficial for the development of nanophotonic *** addition,we designed a flexible chiral device based on PDMS,which exhibits a good CD value and excellent stability even after multiple inward and outward *** excellent compatibility to various substrates makes the planar CMs more flexible in practical applications in microfluidic biosensing.

关键词： Chiral metamaterials Colloidal lithography nanophotonics Metasurfaces Plasmonics nanofabrications Flexible devices

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