Author Affiliations
Abstract
School of Information and Control Engineering, China University of Mining and Technology, Xuzhou 221116, China
Toroidal multipole is a special current distribution that has many different characteristics from electric multipole and magnetic multipole distributions. Because of its special properties, the toroidal dipole is a research hotspot in the field of metamaterials and nanophotonics. However, the low scattering of the toroidal dipole moment makes its excitation a challenging task. At present, there are relatively few studies on its specific engineering applications. In this paper, by slotting in the rectangular cavity, the excitation of an equivalent toroidal dipole is successfully achieved over a wide frequency range of 53–58 GHz. Results indicate that under the action of the toroidal dipole, the TE10 mode electromagnetic waves transmitted in the rectangular waveguide are converted into vector beams and are radiated outwards. Further adjusting the spatial distribution of the magnetic dipoles in the toroidal dipoles yields results that indicate that the resonance mode in the slot is still dominated by the magnetic toroidal dipole moment, and the electromagnetic waves radiating outward are vortex beams carrying vector polarization. The scattered energy of each dipole moment inside the antenna is calculated. This calculation verifies that the mass of the vector beam and vector vortex beam is closely related to the toroidal dipole supported by this antenna. The proposed structure can be applied to explorations in vortex filtering, in photon entanglement, and in the photonic spin Hall effect.
toroidal dipole vector beams vector vortex beams 
Chinese Optics Letters
2024, 22(1): 011601
Xinliang Li 1,*Hao Luo 2,**
Author Affiliations
Abstract
1 Key Laboratory of Material Physics, Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Ministry of Education, Zhengzhou 450052, People’s Republic of China
2 School of Materials Science and Engineering, Zhengzhou University, Zhengzhou University, Zhengzhou 450052, People’s Republic of China
Achieving high absorption in broad terahertz bands has long been challenging for terahertz electromagnetic wave absorbers. Recently in Nature Photonics, Xiao et al. reported the high absorption approaching the theoretical upper limit across the whole terahertz band of MXene-based terahertz absorbers and, on this basis, constructed an applicable, updated alternating current impedance matching model.
Nano-Micro Letters
2023, 15(1): 198
Author Affiliations
Abstract
1 Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, University of Chinese Academy of Sciences, Hangzhou 310024, China
2 State Key Laboratory of Modern Optical Instrumentation, Department of Optical Engineering, Zhejiang University, Department of Optical Engineering, Hangzhou 310027, China
Colorful radiative coolers (CRCs) can be widely applied for energy sustainability especially and meet aesthetic purposes simultaneously. Here, we propose a high-efficiency CRC based on thin film stacks and engineered diffuse reflection unit, which brings out 7.1 °C temperature difference compared with ambient under ~ 700 W·m-2 solar irradiation. Different from analogous schemes, the proposed CRCs produce vivid colors by diffuse reflection and rest of the incident light is specular-reflected without being absorbed. Adopting the structure of TiO2/SiO2 multilayer stack, the nanophotonic radiative cooler shows extra low absorption across the solar radiation waveband. Significant radiative cooling performance can be achieved with the emissivity reaching 95.6% in the atmosphere transparent window (8–13 μm). Moreover, such CRC can be fabricated on flexible substrates, facilitating various applications such as the thermal management of cars or wearables. In conclusion, this work demonstrates a new approach for color display with negligible solar radiation absorption and paves the way for prominent radiative cooling.
PhotoniX
2023, 4(1): 25
Author Affiliations
Abstract
School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
In this Letter, we propose a simple structure of an orthogonal type double Michelson interferometer. The orthogonal detection method overcomes the problems of uneven ranging sensitivity and the inability of traditional interferometers to determine the displacement direction. The displacement measurement principle and signal processing method of the orthogonal double interferometer are studied. Unlike the arctangent algorithm, the displacement analysis uses the arc cosine algorithm, avoiding any pole limit in the distance analysis process. The minimum step size of the final experimental displacement system is 5 nm, which exhibits good repeatability, and the average error is less than 0.12 nm.
orthogonal detection nanoscale displacement measurement laser interferometer 
Chinese Optics Letters
2023, 21(10): 101201
刘海 1,2,*任紫燕 1,2陈聪 1,2高鹏 1,2[ ... ]罗灏 1,2
作者单位
摘要
1 中国矿业大学地下空间智能控制教育部工程研究中心,江苏 徐州 221116
2 中国矿业大学信息与控制工程学院,江苏 徐州 221116
基于Fano共振超表面所具有的高品质因数Q以及电场局域特性设计了一种全介质超表面结构,探究了超表面结构参数与品质因数Q、调制深度之间的关系。通过改变结构实现了单重Fano共振至双重Fano共振的有效调控。对比同等参数下矩形柱与椭圆柱超表面结构的灵敏度,选择矩形柱结构并确定其最优参数。矩形柱超表面结构的品质因数Q最大可达3408,双重Fano共振峰的调制深度接近99%。通过仿真计算可知该结构对甲烷体积分数的测量灵敏度可以达到1.57 nm/%(对应dip1)和1.66 nm/%(对应dip2),对背景折射率的测量灵敏度为419.45 nm/RIU395.7 nm/RIU,FOM(figure of merit)值分别为524.3 RIU-1542.8 RIU-1。此外,入射光偏振角度对此传感结构的Fano共振透射光谱强度具有一定影响,这一特性为光学非对称传输、偏振角检测以及超表面多功能复用等提供了新思路。
传感器 Fano共振 全介质超表面 甲烷传感器 偏振敏感 光学传感器 sensor Fano resonance all-dielectric metasurface methane sensor polarization sensitivity optical sensor 
中国激光
2023, 50(10): 1010001
Guang Yang 1,2,3Hao Luo 2,3Jiajun Li 2,3Qinqin Shao 2,3[ ... ]Rong Wang 2,3,***
Author Affiliations
Abstract
1 Key Laboratory of Optical Field Manipulation of Zhejiang Province, Department of Physics, Zhejiang Sci-Tech University, Hangzhou 310018, China
2 State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
3 Hangzhou Innovation Center, Zhejiang University, Hangzhou 311200, China
4 School of Materials Science and Engineering & Henan Institute of Advanced Technology, Zhengzhou University, Zhengzhou 450001, China
Discrimination of dislocations is critical to the statistics of dislocation densities in 4H silicon carbide (4H-SiC), which are routinely used to evaluate the quality of 4H-SiC single crystals and homoepitaxial layers. In this work, we show that the inclination angles of the etch pits of molten-alkali etched 4H-SiC can be adopted to discriminate threading screw dislocations (TSDs), threading edge dislocations (TEDs) and basal plane dislocations (BPDs) in 4H-SiC. In n-type 4H-SiC, the inclination angles of the etch pits of TSDs, TEDs and BPDs in molten-alkali etched 4H-SiC are in the ranges of 27°?35°, 8°?15° and 2°?4°, respectively. In semi-insulating 4H-SiC, the inclination angles of the etch pits of TSDs and TEDs are in the ranges of 31°?34° and 21°?24°, respectively. The inclination angles of dislocation-related etch pits are independent of the etching duration, which facilitates the discrimination and statistic of dislocations in 4H-SiC. More significantly, the inclination angle of a threading mixed dislocations (TMDs) is found to consist of characteristic angles of both TEDs and TSDs. This enables to distinguish TMDs from TSDs in 4H-SiC.Discrimination of dislocations is critical to the statistics of dislocation densities in 4H silicon carbide (4H-SiC), which are routinely used to evaluate the quality of 4H-SiC single crystals and homoepitaxial layers. In this work, we show that the inclination angles of the etch pits of molten-alkali etched 4H-SiC can be adopted to discriminate threading screw dislocations (TSDs), threading edge dislocations (TEDs) and basal plane dislocations (BPDs) in 4H-SiC. In n-type 4H-SiC, the inclination angles of the etch pits of TSDs, TEDs and BPDs in molten-alkali etched 4H-SiC are in the ranges of 27°?35°, 8°?15° and 2°?4°, respectively. In semi-insulating 4H-SiC, the inclination angles of the etch pits of TSDs and TEDs are in the ranges of 31°?34° and 21°?24°, respectively. The inclination angles of dislocation-related etch pits are independent of the etching duration, which facilitates the discrimination and statistic of dislocations in 4H-SiC. More significantly, the inclination angle of a threading mixed dislocations (TMDs) is found to consist of characteristic angles of both TEDs and TSDs. This enables to distinguish TMDs from TSDs in 4H-SiC.
Journal of Semiconductors
2022, 43(12): 122801
罗利明 1,2,*罗浩 2,3彭同江 2孙红娟 2,4[ ... ]李松林 4
作者单位
摘要
1 西南科技大学核废物与环境安全国防重点学科实验室,四川 绵阳 621010
2 西南科技大学矿物材料及应用研究所,四川 绵阳 621010
3 西南科技大学理学院,四川 绵阳 621010
4 西南科技大学环境与资源学院,四川 绵阳 621010
以新疆蛭石为原料,采用插层-微波法和插层-焙烧法制备了2种高膨胀倍数的膨胀蛭石,利用X射线衍射、场发射扫描电镜等分析手段对产物的物相组成、微观形貌等进行表征分析,并测试了不同加热方式制备膨胀蛭石的阳离子交换容量(CEC)和亚甲基蓝(MB)吸附量。结果表明:2种加热方式制备的膨胀蛭石膨胀率具有明显的差异,焙烧膨胀蛭石(BCV)膨胀倍数(56.12倍)是微波膨胀蛭石(WCV)的1.4倍;在浓度为300 mg/L的亚甲基蓝溶液中,焙烧膨胀蛭石吸附MB能力差,而微波膨胀蛭石因其具有高阳离子交换容量而对MB具有很好的吸附性能,吸附量最高可达391.26 mg/g。
微波 焙烧 膨胀蛭石 阳离子交换容量 吸附性 microwave calcined expanded vermiculite cation exchange capacity adsorption 
硅酸盐学报
2022, 50(1): 236
作者单位
摘要
合肥工业大学化学与化工学院,合肥 230009
以金属有机框架-74为模板制备了仿锤体状Co3O4,然后与单质Ag复合,通过界面工程提高了材料电导率,制备出Li-O2电池的高活性催化剂Ag/Co3O4。在100 mA/g电流密度,使用Ag/Co3O4催化剂的Li-O2电池的放电比容量达到了13 945 mA·h/g,即使在1 000 mA/g高电流密度,依然可以保持4 476.3 mA·h/g的放电比容量,证明其具有出色的倍率性能。同时,循环性能也得到了大幅提高,在电流密度为500 mA/g,限制比容量为1 000 mA·h/g,使用Ag/Co3O4催化剂的电池可以稳定循环195圈,而使用Co3O4催化剂的电池只能循环42圈。
 金属有机框架 四氧化三钴 锂空气电池 silver metal-organic framework cobalt tetroxide lithium-air batteries 
硅酸盐学报
2022, 50(1): 62
作者单位
摘要
中国矿业大学 教育部地下空间智能控制工程研究中心,江苏 徐州 221116
设计了一种基于石墨烯的新型可调谐宽带超材料吸收器。该吸收器采用经典夹层结构,包含一个图案化的单层石墨烯超表面、介电层和金属底板。该石墨烯图案的结构由不同尺寸的石墨烯谐振器组成,确保高吸收率的同时能拓宽吸收带宽。研究结果表明,当费米能级Ef为0.9 eV时,吸收器在光源垂直入射条件下能实现2.3~5.2 THz波段90%以上的宽带吸收率,同时通过控制石墨烯的费米能级可以灵活调节吸收器的带宽和吸收性能。此外,基于单元结构的对称设计,吸收器对偏振角度的变化并不敏感,所设计的吸收器结构将促进石墨烯材料在太赫兹波段和新型吸波器件中的广泛应用。
超材料 太赫兹 时域有限差分法 石墨烯 吸收器 Metamaterials Terahertz Finite difference time domain method Graphene Absorbers 
光子学报
2022, 51(9): 0923001
作者单位
摘要
浙江大学光电科学与工程学院现代光学仪器国家重点实验室, 浙江 杭州 310027
液晶偏振体光栅作为一种新型波导耦合元件,因其较宽的角度响应带宽和独特的偏振特性而受到关注。然而,目前对液晶偏振体光栅的研究还在初步阶段,基于液晶偏振体光栅的波导显示系统主要存在出瞳范围较小的缺点。制备了中心波长为532 nm、光束垂直入射时反射衍射角为50°的液晶偏振体光栅,光栅峰值衍射效率达到75%。将其作为波导显示系统的耦合元件可实现图像的传输和显示。同时,设计和实现了出瞳在一维和二维方向上的扩展,将出瞳扩大了到14 mm×12 mm的范围。
光栅 光学器件 衍射光栅 显示系统 波导 液晶 gratings optical devices diffraction grating display system waveguides liquid crystal 
光学学报
2022, 42(10): 1005002

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