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Anti-Jahn-Teller effect induced ultrafast insulator to metal transition in perovskite BaBiO_(3)

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npj Computational Materials 2022年第1期8卷 2148-2154页

作者： Nan Feng Jian Han Changpeng Lin Zhengwei Ai chuwen Lan ke Bi Yuanhua Lin Kan-Hao Xue Ben Xu State key Laboratory of Information Photonics and Optical Communications School of ScienceBeijing University of Posts and Telecommunications100876BeijingChina Graduate School of China Academy of Engineering Physics 100193BeijingChina State key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua University100084BeijingChina Theory and Simulation of Materials(THEOS) École Polytechnique Fédérale de LausanneCH-1015LausanneSwitzerland School of Integrated Circuits School of Optical and Electronic InformationHuazhong University of Science and Technology430074WuhanChina

The Jahn-Teller(JT)effect involves the ions M with a degenerate electronic state distorting the corner-sharing MO_(6)octahedra to lift the degeneracy,inducing strong coupling of electrons to lattice,and mediating the exotic properties in perovskite ***,the anti-Jahn–Teller(AJT)effect refers to the deformation against the Jahn-Teller-distorted MO_(6)***,it is difficult to experimentally execute both effects descending from the fine-tuning of crystal *** propose the AJT can be introduced by THz laser illumination at 11.71 THz in a candidate superconducting perovskite material BaBiO_(3)near room *** illumination coherently drives the infrared-active phonon that excites the Raman breathing mode through the quadratic-linear nonlinear *** process is characterized by the emergence of an AJT effect,accompanied by an insulator-to-metal transition occurring on the picosecond *** study underlines the important role of crystal structure engineering by coherent phonon excitation in designing optoelectronic devices.

关键词： tuning effect illumination

A Small-Divergence-Angle Orbital Angular Momentum Metasurface Antenna

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Research 2019年第1期2019卷 149-156页

作者： Jianchun Xu ke Bi Ru Zhang Yanan Hao chuwen Lan Klaus D.McDonald-Maier Xiaojun Zhai Zidong Zhang Shanguo Huang State key Laboratory of Information Photonics and Optical Communications School of ScienceBeijing University of Posts and TelecommunicationsBeijing 100876China Beijing University of Posts and Telecommunications Research Institute Shenzhen 518057China Beijing key Laboratory of Space-Ground Interconnection and Convergence Beijing University of Posts and TelecommunicationsBeijing 100876China School of Computer Science and Electronic Engineering University of EssexColchester CO43SQUK key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) Shandong UniversityJinan 250061China

Electromagnetic waves carrying an orbital angular momentum (OAM) are of great interest. However, most OAM antennas presentdisadvantages such as a complicated structure, low efficiency, and large divergence angle, which prevents their practicalapplications. So far, there are few papers and research focuses on the problem of the divergence angle. Herein, a metasurfaceantenna is proposed to obtain the OAM beams with a small divergence angle. The circular arrangement and phase gradient wereused to simplify the structure of the metasurface and obtain the small divergence angle, respectively. The proposed metasurfaceantenna presents a high transmission coefficient and effectively decreases the divergence angle of the OAM beam. All thetheoretical analyses and derivation calculations were validated by both simulations and experiments. This compact structurepaves the way to generate OAM beams with a small divergence angle.

关键词： antenna surface divergence

Experimental demonstration of ultra-large-scale terahertz all-dielectric metamaterials

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Photonics Research 2019年第4期7卷 457-463页

作者： ke BI DAQUAN YANG JIA CHEN QINGMIN WANG HONGYA WU chuwen LAN YUPING YANG State key Laboratory of Information Photonics and Optical Communications School of Science Beijing University of Posts and Telecommunications School of Materials Science and Engineering Shijiazhuang Tiedao University School of Science Minzu University of China

All-dielectric metamaterials have emerged as a promising platform for low-loss and highly efficient terahertz devices. However, existing fabrication methods have difficulty in achieving a good balance between precision and cost. Here, inspired by the nano-template-assisted self-assembly method, we develop a micro-templateassisted self-assembly(MTAS) method to prepare large-scale, high-precision, and flexible ceramic microsphere all-dielectric metamaterials with an area exceeding 900 cm × 900 cm. Free from organic solvents, vacuum, and complex equipment, the MTAS method ensures low-cost and environmentally friendly fabrication. The ceramic microsphere resonators can be readily assembled into nearly arbitrary arrangements and complex aggregates, such as dimers, trimers, quadrumers, and chains. Finally, using the heat-shrinkable substrate and dipole coupling effect, a broadband reflector with a bandwidth of 0.15 THz and a reflection of up to 95% is *** work provides a versatile and powerful platform for terahertz all-dielectric metamaterials, with potential to be applied in a wide variety of high-efficiency terahertz devices.

关键词： All-dielectric metamaterials promising platform applied in a wide variety

永康方岩风景名胜区文化景观与胡公信仰耦合发展研究

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中国园林 2020年第4期36卷 94-98页

作者：袁珂王声菲陈楚文汉嘉设计集团股份有限公司杭州310005 浙江农林大学园林设计院临安311300 浙江农林大学风景园林与建筑学院

永康方岩国家级风景名胜区历史悠久,其历史人文景观的发展与胡公信仰的形成和演化有着密切的联系。通过对方岩风景名胜区相关历史文献的梳理与考证,对宋代以来胡公信仰影响下方岩风景名胜区发展与演变进行分析,并以此为基础对二者之间... 详细信息

永康方岩国家级风景名胜区历史悠久,其历史人文景观的发展与胡公信仰的形成和演化有着密切的联系。通过对方岩风景名胜区相关历史文献的梳理与考证,对宋代以来胡公信仰影响下方岩风景名胜区发展与演变进行分析,并以此为基础对二者之间相互耦合的发展机制进行探讨。在胡公信仰文化变迁梳理的基础上,总结了各时期胡公信仰影响下方岩风景名胜区文化景观格局的转变,探析了各个历史时期方岩的文化景观特征,从而对二者的发展特点进行归纳总结。

关键词：风景园林胡公信仰永康方岩风景名胜区文化景观特征

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可调介质超材料研究进展

中国材料进展 2019年第1期38卷 1-13+41页

作者：毕科王旭莹兰楚文郝亚楠周济北京邮电大学理学院清华大学材料学院

超材料由于具有自然界材料所不具备的一些独特的电磁和光学特性而被广泛关注与研究。相比于传统金属结构超材料,介质超材料不仅可以低损耗地实现超常电磁特性,而且对外场具有很高的敏感度,其电磁参数随磁场、电场、温度等外场的变化而改... 详细信息

超材料由于具有自然界材料所不具备的一些独特的电磁和光学特性而被广泛关注与研究。相比于传统金属结构超材料,介质超材料不仅可以低损耗地实现超常电磁特性,而且对外场具有很高的敏感度,其电磁参数随磁场、电场、温度等外场的变化而改变,因而受到了功能材料和信息器件领域研究者的广泛关注。分别从磁可调、电可调和温度可调3个方面介绍可调介质超材料。首先,对于磁可调介质超材料,介绍了基于铁氧体的多种磁可调结构的研究进展以及铁磁谐振原理;其次,对于电可调介质超材料,介绍了基于石墨烯、变容二极管和液晶材料的多种电可调结构的研究进展;最后,对于温度可调介质超材料,介绍了基于二氧化钒、锑化铟和钛酸锶材料实现温度可调性能的研究进展及其相应物理机制,并展望了可调介质超材料的发展趋势和潜在应用。

关键词：超材料可调介质超材料磁可调电可调温度可调

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明清永康五峰书院园林艺术研究

建筑与文化 2019年第4期 135-136页

作者：袁珂陈楚文浙江农林大学浙江农林大学园林设计院

五峰书院是宋代永康学派的发源地,明清时期五峰书院园林成熟,书院园林与书院文化共生,形成了符合山地特质的书院园林,园林艺术达到顶峰。文章对明清时期五峰书院的园林选址、空间布局、园林各要素进行了多角度的解析,对其所体现的园林... 详细信息

五峰书院是宋代永康学派的发源地,明清时期五峰书院园林成熟,书院园林与书院文化共生,形成了符合山地特质的书院园林,园林艺术达到顶峰。文章对明清时期五峰书院的园林选址、空间布局、园林各要素进行了多角度的解析,对其所体现的园林意境进行了总结,从而对五峰书院的园林艺术进行表达。

关键词：明清五峰书院园林艺术

构筑物中乡土文化的景观转译--以杭州市余杭区瓶窑镇美丽乡村精品线为例

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城市建筑 2021年第5期18卷 164-166,175页

作者：杨可江晓薇陈楚文浙江农林大学风景园林与建筑学院浙江杭州311300

文章讨论了乡土文化的概念、特点和重要意义,认为景观语言是要在对文化深入了解的基础上形成认知框架与系统,再进行转译。并以杭州市余杭区瓶窑镇美丽乡村精品线为例,详细讨论了精品线"窑乡桃韵"主题在构筑物上的景观语言转译与建构。... 详细信息

文章讨论了乡土文化的概念、特点和重要意义,认为景观语言是要在对文化深入了解的基础上形成认知框架与系统,再进行转译。并以杭州市余杭区瓶窑镇美丽乡村精品线为例,详细讨论了精品线"窑乡桃韵"主题在构筑物上的景观语言转译与建构。在构筑物中植入乡土文化,通过传承乡土文化,保留或重建建筑样式或文化符号;从更广阔的时空或领域中引用诗词,产生隔时空对话;将现代与传统的材料融合,建立起现代景观语言与文化的血脉联系,激发场地生机与活力。

关键词：乡土文化构筑物景观语言转译