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Texture and Se vacancy optimization induces high thermoelectric performance in Bi_(2)Se_(3) flexible thin films

Rare Metals 2024年第6期43卷 2796-2804页

作者： Dong-Wei Ao Wei-Di Liu Yue-Xing Chen Fan Ma Yi-Jie Gu Zhuang-Hao Zheng School of Machinery and Automation Weifang UniversityWeifang 261061China Australian Institute for Bioengineering and Nanotechnology The University of QueenslandBrisbane 4072Australia Shenzhen Key Laboratory of Advanced Thin Films and Applications Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen518060China School of Materials Science and Engineering Inner Mongolia University of TechnologyHohhot 010051China

Bi_(2)Se_(3)-based flexible thin film with high thermoelectric performance is promising for the waste heat recovery *** this work,a novel post-selenization method is employed to prepare n-type Bi_(2)Se_(3)flexible thin films with highly textured *** strengthened texture and Se vacancy optimization can be simultaneously achieved by optimizing the selenization *** highly oriented texture leads to the increased carrier mobility and results in a high electric conductivity of~290.47 S·cm^(-1)at 623 ***,a high Seebeck coefficient(>110μW·K-1)is obtained due to the reduced carrier concentration,induced by optimizing vacancy ***,a high power factor of 3.49μW·cm^(-1)·K^(-2)at 623 K has been achieved in asprepared highly-bendable Bi_(2)Se_(3)flexible thin films selenized at 783 *** study introduces an effective post-selenization method to tune the texture structure and vacancies of Bi_(2)Se_(3)flexible thin films,and correspondingly achieves high thermoelectric performance.

关键词： Thermoelectric Bi_(2)Se_(3) Flexible thin film Post-selenization

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Revealing structure correlation between ionic liquid and metal-organic framework matrix

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Magnetic Resonance Letters 2024年第2期4卷 65-72页

作者： Ligang Xu Wenda Zhang Chenjie Lou Chenxu Geng Yuxiu Sun Jie Liu Yongchao Shi Huajie Luo Jipeng Fu Haiyan Zheng Mingxue Tang Center for High Pressure Science and Technology Advanced Research Beijing100193China College of Materials Science and Engineering Guilin University of TechnologyGuilin541004China State Key Laboratory of Separation Membranes and Membrane Processes School of Material Science and EngineeringTiangong UniversityTianjin300387China University of Science and Technology Beijing Beijing100083China Key Laboratory of Rare Earth Optoelectronic Materials and Devices of Zhejiang Province Institute of Optoelectronic Materials and DevicesChina Jiliang UniversityHangzhou310018China

Solid-state batteries are rising rapidly in response to the fast-increasing energy ***-organic framework(MOF) loaded with ionic liquids has brought new opportunities for solid-state batteries owing to its good interfacial compatibility and high ionic conductivity. MOF-808 is selected to be filled with Li-contained ionic liquid for structure and ion dynamics investigation using nuclear magnetic resonance(NMR) and X-ray *** study finds that the introduced ionic liquid would partially soften the matrix of MOF-808 and thus yield amorphous phase. By selective isotope replacement under cycling symmetric ^(6)Li metal cell, Li^(+)ion is observed to mainly go cross ionic liquid in the open channel of matrix under potential polarization.

关键词： Nuclear magnetic resonance Solid-state batteries MOF-808 Ionic liquid Local structure

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Direction independent flipped spin splitting controlled by linearly polarized light

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Optics Express 2025年第12期33卷 25708-25717页

作者： Kaihao Zheng Hao Zhou Wenjia Li Zhaoqi Jiang Yehan Wang Chunhua Qin Chunying Guan Jianlong Liu Jinhui Shi Key Laboratory of Photonic Materials and Devices Physics for Oceanic Applications Ministry of Industry and Information Technology of China College of Physics and Optoelectronic Engineering Harbin Engineering University Harbin 150001 China Key Laboratory of In-Fiber Integrated Optics of Ministry of Education College of Physics and Optoelectronic Engineering Harbin Engineering University Harbin 150001 China

Spin splitting, arising from spin-orbit interaction of light, has garnered increasing attention due to its potential applications in polarization detection, optical metrology, optical sensing, and optical computing. Here, we demonstrate a direction independent flipped spin splitting, which is realized through orthogonal linearly polarized incidences on conjugate particles. Specifically, the flipped spin splitting is achieved by constructing opposite spin dipoles, leveraging the electric field coupling of the conjugate particle. By employing dipole models, we elucidate the relationship between the polarization state of the scattered far field and the incident polarization state. Furthermore, we demonstrate that consistent spin splitting can be achieved with a constant incident electric field polarization, regardless of variations in the incident wave vector direction. Our findings provide promising opportunities for manipulating spin states in the scattered far field and broadening the applications of conjugate particles.

关键词： Circular polarization Evanescent waves Integrated photonics Liquid crystals Optical computing Optical fields

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Low-Cost and High-Performance Polymer Solar Cells with Efficiency Insensitive to Active-Layer Thickness

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CCS Chemistry 2023年第12期5卷 2945-2955页

作者： Xiaolei Kong Jinyuan Zhang Lei Meng Chenkai Sun Xin Jiang Jianqi Zhang Can Zhu Guangpei Sun Jing Li Xiaojun Li Zhixiang Wei Yongfang Li Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190 School of Chemical Science University of Chinese Academy of SciencesBeijing 100049 College of Chemistry and Green Catalysis CenterZhengzhou UniversityZhengzhou 450001 CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190 Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190 Laboratory of Advanced Optoelectronic Materials Suzhou Key Laboratory of Novel Semiconductor-Optoelectronics Materials and DevicesCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123

The power conversion efficiency(PCE)of polymer solar cells(PSCs)has recently increased quickly,propelling PSCs closer to large-scale ***,several critical issues,such as the cost of materials and the sensitivity of the PCE to active-layer thickness,must be addressed before industrial application can be realized on a large ***,we fabricated a high-performance ternary PSC based on a low-cost polymer donor PTQ10 and an A-DA’D-A-type small molecule acceptor(SMA)2,2'-((2Z,2'Z)-((12,13-bis(2-butyloctyl)-3,9-bis(4-(2-ethylhexyl)thiophen-2-yl)-12,13-dihydro-[1,2,5]thiadiazolo[3,4-e]thieno[2'',3'':4',5']thieno[2',3':4,5]pyrrolo[3,2-g]thieno[2',3':4,5]thieno[3,2-b]indole-2,10-diyl)bis(methaneylylidene))bis(5,6-difluoro-3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile(m-TEH)with a newA-DA’D-A-type SMA 2,2'-((2Z,2'Z)-((12,13-bis(2-butyloctyl)-3,9-bis(3-(2-ethylhexyl)phenyl)-12,13-dihydro-[1,2,5]thiadiazolo[3,4-e]thieno[2'',3'':4',5']thieno[2',3':4,5]pyrrolo[3,2-g]thieno[2',3':4,5]thieno[3,2-b]indole-2,10-diyl)bis(methaneylylidene))bis(5,6-difluoro-3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile(m-PEH)(with phenyl outer side chains)as the third *** from the good compatibility and the unique alignment of the energy levels between PTQ10 and the two SMAs,the ternary system showed favorable phase separation and dominant face-on orientation,exhibiting suitable film morphology and enhanced charge ***,the optimized ternary PSCs based on PTQ10∶m-TEH∶m-PEH(1.0∶0.9∶0.3,w/w/w)demonstrated an outstanding PCE of 19.34%,which is one of the highest PCEs reported for the single junction PSCs to *** importantly,the ternary PSCs demonstrated superior tolerance to the active-layer thickness and showed a high PCE of 18.02% with a high fill factor(FF)of 76.56% for the devices with the active-layer thickness even reaching 300 *** results indicate that the ternary devices based on PTQ10∶m-TEH∶m-PEH are highly

关键词： ternary polymer solar cells A-DA’D-A-type small molecule acceptors side chain engineering insensitive to active-layer thickness commercial application

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Fractional Chern insulator candidate on a twisted bilayer checkerboard lattice

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Physical Review B 2024年第16期110卷 165142页

作者： Jia-Zheng Ma Rui-Zhen Huang Guo-Yi Zhu Ji-Yao Chen Dao-Xin Yao Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices State Key Laboratory of Optoelectronic Materials and Technologies Center for Neutron Science and Technology School of Physics Department of Physics and Astronomy University of Cologne Zülpicher Straße 77 50937 Cologne Germany

We investigate a fractional Chern insulator (FCI) candidate arising from moiré bands with higher Chern number C=2 on a magic-angle twisted bilayer checkerboard lattice (MATBCB). There are two nearly flat low lying bands in the single-particle energy spectrum under the first magic angle ϕ≈1.608∘ and chiral limit. We find that MATBCB hosts a nearly uniform Berry curvature distribution and exhibits tiny violation of quantum geometric trace condition in the first moiré Brillouin zone (mBZ), indicating that there is a nearly ideal quantum geometry in MATBCB in single-particle level. Turning on projected Coulomb interactions, we perform exact diagonalization and find a 10-fold ground-state quasidegeneracy in many-body energy spectrum with filling fraction ν=1/5. The 10-fold quasidegenerate ground states further show spectra flow under flux pumping. By diagnosing the particle entanglement spectrum (PES) of the ground states, we obtain a clear PES gap and quasihole state counting consistent with Halperin spin singlet generalized Pauli principle, suggesting that a C=2 Abelian fractional Chern insulator is realized in this system.

关键词： Flat bands Landau levels Quantum Hall effect Topological insulators Twistronics Lattice types Quantum many-body systems Strongly correlated systems Bloch wave theory Density matrix methods Exact solutions for many-body systems Numerical techniques Tight-binding model

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Phase diagram and critical behavior of the Hubbard model on the square-hexagon-octagon lattice

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Physical Review B 2024年第15期109卷 155122-155122页

作者： Xinwei Jia Dao-Xin Yao Han-Qing Wu Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices State Key Laboratory of Optoelectronic Materials and Technologies Center for Neutron Science and Technology School of Physics Sun Yat-sen University Guangzhou 510275 China International Quantum Academy Shenzhen 518048 China

Employing the projective formalism of determinant quantum Monte Carlo (DQMC) simulations, we meticulously explore the ground-state phase diagram and critical behavior of the half-filled Hubbard model on a square-hexagon-octagon (SHO) lattice. This lattice, a two-dimensional (2D) structure comprising squares, hexagons, and octagons, is representative of the biphenylene network (BPN). Our findings reveal an intriguing ground-state phase diagram, featuring an antiferromagnetic (AFM) Mott insulating phase enveloped by three valence-bond-solid-like (VBS-like) insulating phases. Analyzing the single-particle gap, spin gap, and single-particle spectral function, we observe that the metallic state in the noninteracting case becomes unstable under the influence of Hubbard U. This interaction drives the system into a hexagon insulating phase before transitioning into an AFM Mott insulating phase. To quantify the critical exponents, we use finite-size scaling techniques. The critical exponents of quantum critical points between the AFM Mott insulating phase and two insulating phases, plaquette insulator, and ethylene insulator, closely align with the 3D O(3) universality class. However, the critical exponents of quantum critical points between the hexagon insulating phase and the AFM Mott insulating phase deviate from the 3D O(3) universality class. This deviation can be attributed to the coupling effect between the fluctuations of magnetic order parameters and very low-energy fermionic excitations. Our comprehensive study not only advances the understanding of correlation effects on the SHO lattice but also sheds light on the less-explored critical exponents in a weakly insulating quantum critical point.

关键词： Critical exponents Phase diagrams Mott insulators Two-dimensional electron system Hubbard model Quantum Monte Carlo

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A hybrid algorithm for reducing PAPR of CO-OFDM system based on fast Hadamard transformation cascading SLM

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optoelectronics Letters 2021年第9期17卷 534-538页

作者： LIU Ye TONG Zhengrong ZHANG Weihua LI Tingting WANG Mingxu Tianjin Key Laboratory of Film Electronic and Communication Devices Engineering Research Center of Optoelectronic Devices and Communication TechnologyMinistry of EducationSchool of Electrical and Electronic EngineeringTianjin University of TechnologyTianjin 300384China

In this paper,a hybrid technique using fast Hadamard transformation cascading a selective mapping(FHT-SLM)is proposed to reduce peak-to-average power ratio(PAPR)and complexity in coherent optical orthogonal frequency division multiplexing(CO-OFDM)*** Hadamard transform is used to reduce the autocorrelation of signals so as to reduce the PAPR of *** fast Hadamard transform(FHT)algorithm is obtained by recursive decomposition of sparse matrix of a simple Hadamard matrix,which improves the computational efficiency and greatly reduces the computational ***,a selective mapping(SLM)scheme is used to select the smallest frame of PAPR in the time domain to further reduce PAPR of OFDM *** simulation results show that at the complementary cumulative distribution function(CCDF)of10-4,the PAPR of the proposed scheme FHT-SLM(V=8)is optimized to 7.63 d ***,when the bit error rate(BER)is 10-3,the optical signals to noise ratio(OSNR)of FHT-SLM(V=8)algorithm is 21.2 d *** total computational cost of the FHT-SLM(V=8)is ***,the simulation results prove that the proposed algorithm provides a choice for a balance among PAPR,BER and complexity.

关键词： Hadamard algorithm autocorrelation

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Research on an automatic light field refocusing method for a camera array

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Optics Express 2025年第10期33卷 20964-20980页

作者： Pan, Yihua Zhao, Yushan Li, Yuyang Liu, Bin Chen, Ping Shanxi Key Laboratory of Intelligent Detection Technology & Equipment School of Information and Communication Engineering North University of China Shanxi Taiyuan030051 China Key Laboratory of Photoelectronic Imaging Technology System of Ministry of Education of China School of Optics and Photonics Beijing Institute of Technology Beijing100081 China State Key Laboratory of Extreme Environment Optoelectronic Dynamic Testing Technology and Instruments North University of China Shanxi Taiyuan030051 China

Light field information includes the position and angle information of light in space. A camera array is one of the methods for obtaining light field information, which combines and arranges multiple cameras in space to achieve multi-angle imaging of the same target. Based on the light field information, a computational imaging method can be used to achieve refocusing technology for a camera array (also known as optical synthetic aperture imaging technology). In this technology, by setting the focusing coefficient, the light field information can be focused on different depths. This mode is called taking photos first and focusing later. However, in order to focus on a specific object surface, traditional refocusing methods require users to manually adjust the focusing coefficient multiple times, which is time-consuming and user-unfriendly. Therefore, in this paper, we propose an automatic focusing method based on the optimal focusing coefficient map (OFCM) to address the manual refocusing problem. This method transforms the refocusing problem into obtaining the optimal focus coefficient map. In the process of solving OFCM, the threshold filtering method and the neighborhood filling method are used to optimize the results and improve the robustness of the proposed method. The experimental results show that our proposed method has higher imaging quality and faster running efficiency compared to automatic refocusing methods based on disparity maps and gradient functions. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Computational Imaging

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Ti-diffused KTN waveguide enabling intensity modulation based on the quadratic electro-optic effect

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Optics Express 2025年第11期33卷 23269-23279页

作者： Wang, Tao Wang, Yu Tan, Peng Xing, Bohan Li, Zhenghao Liu, Mingxuan Zhu, Ziyao Tian, Hao School of Physics Harbin Institute of Technology Harbin150001 China Heilongjiang Provincial Key Laboratory of Advanced Quantum Functional Materials and Sensor devices Harbin150001 China Key Laboratory of Micro-Nano Optoelectronic Information System Ministry of Industry and Information Technology Harbin150001 China

Optical waveguides are fundamental components in integrated optics, enabling the confinement of light beams at micron and nanometer scales. The performance of electro-optic materials is the key to realizing waveguide-based modulation devices. Potassium tantalate niobate (KTN) crystals exhibit exceptional quadratic electro-optic effects, making them highly promising for applications in optical waveguides and electro-optic modulators. This study explored a novel, to our knowledge, optical waveguide leveraging the quadratic electro-optic effect of KTN crystals. Buried waveguides with a width of 10 µm were fabricated in KTN crystals using the titanium ion diffusion method. The impact of ion diffusion on the crystal structure of KTN was analyzed using confocal Raman spectroscopy. Based on the optical waveguide, an intensity modulator with a single waveguide and an extinction ratio of 14.2 dB at 1550 nm was developed. The modulator’s different modulation functions were evaluated without and with an applied bias voltage. This research offers valuable insights for the design and production of low-driving, efficient electro-optic modulation devices in integrated optics. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Integrated optics

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Stimulated emission-depletion-based point-scanning structured illumination microscopy

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Chinese Optics Letters 2024年第3期22卷 95-100页

作者：汪磊王美婷王璐玮郑晓敏陈嘉杰吴文帅严伟于斌屈军乐高志邵永红 Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging National-Regional Key Technology Engineering Laboratory for Medical UltrasoundSchool of Biomedical EngineeringShenzhen University Medical SchoolShenzhen 518060China Key Laboratory of Opto-electronic Information Science and Technology of Jiangxi Province Nanchang Hangkong UniversityNanchang 330063China College of Physics and Optoelectronics Engineering Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceShenzhen UniversityShenzhen 518060China Department of Bioengineering and COMSET Clemson UniversityClemson SC 29634US

Wide-field linear structured illumination microscopy(LSIM)extends resolution beyond the diffraction limit by moving unresolvable high-frequency information into the passband of the microscopy in the form of moiré***,due to the diffraction limit,the spatial frequency of the structured illumination pattern cannot be larger than the microscopy cutoff frequency,which results in a twofold resolution improvement over wide-field *** Letter presents a novel approach in point-scanning LSIM,aimed at achieving higher-resolution improvement by combining stimulated emission depletion(STED)with point-scanning structured illumination microscopy(ps SIM)(STED-ps SIM).The according structured illumination pattern whose frequency exceeds the microscopy cutoff frequency is produced by scanning the focus of the sinusoidally modulated excitation beam of STED *** experimental results showed a 1.58-fold resolution improvement over conventional STED microscopy with the same depletion laser power.

关键词： stimulated emission depletion structured illumination microscopy superresolution microscopy

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