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Ultracompact silicon on-chip polarization controller

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Photonics Research 2024年第2期12卷 183-193页

作者： WEIKE ZHAO YINGYING PENG MINGYU ZHU RUORAN LIU XIAOLONG HU YAOCHENG SHI daoxin DAI State Key Laboratory for Modern Optical Instrumentation Center for Optical&Electromagnetic ResearchCollege of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang UniversityZijingang CampusHangzhou 310058China School of Precision Instrument and Optoelectronic Engineering Tianjin UniversityTianjin 300072China Key Laboratory of Optoelectronic Information Science and Technology Ministry of EducationTianjin 300072China Ningbo Research Institute Zhejiang UniversityNingbo 315100China

On-chip polarization controllers are extremely important for various optical *** this paper,a compact and robust silicon-based on-chip polarization controller is proposed and demonstrated by integrating a special polarization converter and phase *** special polarization converter consists of a 1×1 Mach–Zehnder interferometer with two polarization-dependent mode converters at the input/output *** light with an arbitrary state of polarization(SOP)is launched into the chip,the TE_(0)and TM_(0)modes are simultaneously *** polarization extinction ratio(PER)and the phase difference for the TE_(0)∕TM_(0)modes are tuned by controlling the first phase shifter,the polarization converter,and the second phase *** a result,one can reconstruct the light SOP at the output *** fabricated polarization controller,as compact as~150μm×700μm,exhibits an excess loss of less than 1 dB and a record PER range of>54 dB for arbitrary input light beams in the wavelength range of 1530–1620 nm.

关键词： polarization SOP interferometer

Silicon photonic spectrometer with multiple customized wavelength bands

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Photonics Research 2024年第5期12卷 1016-1023页

作者： LONG ZHANG XIAOLIN YI DAJIAN LIU SHIHAN HONG GAOPENG WANG HENGZHEN CAO YAOCHENG SHI daoxin DAI State Key Laboratory for Modern Optical Instrumentation Center for Optical&Electromagnetic ResearchCollege of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang UniversityZjingang CampusHangzhou 310058China Intelligent Optics and Photonics Research Center Jiaxing Research InstituteZhejiang UniversityJiaxing 314000China Ningbo Research Institute Zhejiang UniversityNingbo 315100China

A silicon photonic spectrometer with multiple customized wavelength bands is developed by introducing multiple channels of wideband optical filters based on multimode waveguide gratings(MWGs)for pre-filtering and the corresponding thermally tunable narrowband filter for high *** these multiple customized wavelength bands,the central wavelengths,bandwidths,and resolutions are designed flexibly as desired,so that the system is simplified and the footprint is minimized for several practical applications(e.g.,gas sensing).A customized silicon photonic spectrometer is designed and demonstrated experimentally with four wavelength bands centered around1310 nm,1560 nm,1570 nm,and 1930 nm,which is,to the best of our knowledge,the first on-chip spectrometer available for sensing multiple gas components like HF,CO,H_(2)S,and CO_(2).The spectral resolutions of the four wavelength bands are 0.11 nm,0.08 nm,0.08 nm,and 0.37 nm,*** a customized silicon photonic spectrometer shows great potential for various applications,including gas monitors,wearable biosensors,and portable spectral-domain optical coherence tomography.

关键词： waveguide bands multiple

Synthesis of N-doped carbon quantumn dots as lubricant additive to enhance the tribological behavioor f MoS_(2)nanofluid

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Friction 2023年第3期11卷 441-459页

作者： Jiaqi HE Jianlin suN Junho CHOI Chenglong WANG daoxin su School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Department of Mechanical Engineering The University of TokyoTokyo 113-8656Japan

In this study,a novel lubricant additive nitrogen-doped carbon quantum dot(N-CQD)nanoparticle was prepared by the solvothermal *** synthesized spherical N-CQD nanoparticles in the diameter of about 10 nm had a graphene oxide(GO)-like structure with various oxygen(O)-and nitrogen(N)-containing functional *** N-CQDs were added to MoS_(2)nanofluid,and the tribological properties for steel/steel friction pairs were evaluated using a pin-on-disk ***-equilibrium molecular dynamics(NEMD)simulations for the friction system with MoS_(2)or MoS_(2)+N-CQD nanoparticles were also *** results showed that friction processes with MoS_(2)+N-CQD nanofluids were under the mixed lubrication *** MoS_(2)nanofluid containing 0.4 wt%N-CQDs could achieve 30.4%and 31.0%reduction in the friction coefficient and wear rate,respectively,compared to those without *** analyzing the worn surface topography and chemical compositions,the excellent lubrication performance resulted from the formation of tribochemistry-induced *** average thickness of tribofilm was about 13.9 nm,and it was composed of amorphous substances,ultrafine crystalline nanoparticles,and self-lubricating FeSO_(4)/Fe2(SO_(4))_(3).NEMD simulation results indicated the interaction between S atoms in MoS_(2)as well as these O-and N-containing functional groups in N-CQDs with steel surfaces enhanced the stability and strength of *** the metal surface was further protected from friction and wear.

关键词： carbon-based quantum dots(CQDs) lubricant nanofluid molecular dynamics(MD) tribofilm

Anisotropy-free arrayed waveguide gratings on X-cut thin film lithium niobate platform of in-plane anisotropy

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Light(Science & Applications) 2024年第7期13卷 1416-1426页

作者： Junjie Yi Changjian Guo Ziliang Ruan Gengxin Chen Haiqiang Wei Liwang Lu Shengqi Gong Xiaofu Pan Xiaowan Shen Xiaowei Guan daoxin Dai Kangping Zhong Liu Liu State Key Laboratory of Extreme Photonics and Instrumentation College of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang UniversityHangzhou 310058China. Guangdong Provincial Key Laboratory of Optical Information Materials and Technology South China Academy of Advanced OptoelectronicsSouth China Normal UniversityHigher-Education Mega-CenterGuangzhou 510006China. National Center for International Research on Green Optoelectronics South China Normal UniversityGuangzhou 510006China Photonics Research Institute Department of Electrical and Electronic EngineeringThe Hong Kong Polytechnic UniversityHung HomKowloonHong Kong(SAR)China. Jiaxing Key Laboratory of Photonic Sensing&Intelligent Imaging Intelligent Optics&Photonics Research CenterJiaxing Research Institute Zhejiang UniversityJiaxing 314000China

Arrayed waveguide grating is a versatile and scalable integrated light dispersion device,which has been widely adopted in various applications,including,optical communications and optical ***,thin-film lithium niobate emerges as a promising photonic integration platform,due to its ability of shrinking largely the size of typical lithium niobate based optical *** would also enable multifunctional photonic integrated chips on a single lithium niobate ***,due to the intrinsic anisotropy of the material,to build an arrayed waveguide grating on X-cut thin-film lithium niobate has never been ***,a universal strategy to design anisotropyfree dispersive components on a uniaxial in-plane anisotropic photonic integration platform is introduced for the first *** leads to the first implementation of arrayed waveguide gratings on X-cut thin-film lithium niobate with various configurations and *** best insertion loss of 2.4 dB and crosstalk of−24.1 dB is obtained for the fabricated arrayed waveguide grating *** of such arrayed waveguide gratings as a wavelength router and in a wavelength-division multiplexed optical transmission system are also demonstrated.

关键词： waveguide arrayed lithium

煤制油作为铝冷轧基础油的表面润滑与吸附机理

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石油学报（石油加工） 2023年第3期39卷 650-658页

作者：唐华杰孙建林韩钊苏道昕赵章靓北京科技大学材料科学与工程学院北京100083

为对比研究煤制异构烷烃油(CTL)和传统白油(D100)作为铝冷轧基础油的摩擦学性能和表面吸附机理,分别以CTL和D100为基础油,制备含不同质量分数十二烷醇(DDL)的铝冷轧轧制油,采用四球摩擦磨损试验表征其摩擦学性能;同时,采用量子化学计算... 详细信息

为对比研究煤制异构烷烃油(CTL)和传统白油(D100)作为铝冷轧基础油的摩擦学性能和表面吸附机理,分别以CTL和D100为基础油,制备含不同质量分数十二烷醇(DDL)的铝冷轧轧制油,采用四球摩擦磨损试验表征其摩擦学性能;同时,采用量子化学计算和分子动力学模拟,研究CTL、D100、DDL分子的前线轨道分布及CTL+DDL和D100+DDL 2种体系在铝表面的吸附与相互作用机理。结果表明:CTL的油膜强度(88 N)低于D100(98 N),但其摩擦学性能对DDL的加入更加敏感,当DDL质量分数为6%时,CTL为基础油的铝冷轧轧制油油膜强度为334 N,而以D100为基础油的铝冷轧轧制油油膜强度仅为304 N。当添加剂含量相同时,含CTL的铝冷轧轧制油具有更低的摩擦系数和磨斑直径。理论研究表明:D100分子HOMO和LUMO分布于整个分子主链,CTL分子HOMO位于整个分子主链,但其LUMO分布与DDL分子相似,均位于分子链末端。因而CTL分子与DDL分子具有显著的协同吸附作用,DDL能够促进CTL分子在铝表面形成厚度1.32 nm的分子膜。

关键词：煤制油量子化学计算分子动力学模拟润滑铝材

“浅视听”时代的“深电影”——论《红毯先生》作为“疯狂”的变体

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当代电影 2024年第4期 32-34,38页

作者：李道新北京大学艺术学院

作为一部“疯狂”变体的喜剧电影,《红毯先生》杂糅着宁浩和刘德华两人之间同中有异甚至矛盾冲突的双重视野、批判诉求与思考方式。在致密的隐喻编码和孤独的情绪解码过程中,始终彰显着人群之间的沟通无能,流露出意义过载、痛苦相随与... 详细信息

作为一部“疯狂”变体的喜剧电影,《红毯先生》杂糅着宁浩和刘德华两人之间同中有异甚至矛盾冲突的双重视野、批判诉求与思考方式。在致密的隐喻编码和孤独的情绪解码过程中,始终彰显着人群之间的沟通无能,流露出意义过载、痛苦相随与荒诞虚空、悲凉结局的价值取向。显然,这是一种无关“优雅”,也跟“爽感”背道而驰,但却直击生存困境与灵魂,因此需要更多理解和支持的“浅视听”时代的“深电影”。当然,也需要在已有的“技术”“理性”基础上,更加大胆地寻求改变,努力抵达喜剧电影的更高目标,真正为“浅视听”时代打开一道“深电影”的大门。

关键词：《红毯先生》 “浅视听” “深电影” 宁浩刘德华

原位制备CaCO_(3)微纳米流体及摩擦学性能研究

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润滑与密封 2023年第1期48卷 72-78页

作者：苏道昕孙建林黄瑛唐华杰贺佳琪北京科技大学材料科学与工程学院北京100083

选用菜籽油、失水山梨糖醇脂肪酸酯(Span 80)、壬基酚聚氧乙烯醚(TX-7)、正丁醇制备W/O型微乳液,并将其作为微反应器原位合成CaCO_(3)微纳米粒子。对CaCO_(3)粒子形貌的表征表明,随含水量增加,CaCO_(3)粒子由球形转变为梭形薄片状,CaCO_... 详细信息

选用菜籽油、失水山梨糖醇脂肪酸酯(Span 80)、壬基酚聚氧乙烯醚(TX-7)、正丁醇制备W/O型微乳液,并将其作为微反应器原位合成CaCO_(3)微纳米粒子。对CaCO_(3)粒子形貌的表征表明,随含水量增加,CaCO_(3)粒子由球形转变为梭形薄片状,CaCO_(3)粒子尺寸也可受含水量控制。通过四球摩擦磨损试验机评价CaCO_(3)微纳米流体的摩擦学性能,结果表明,该微乳液体系相较于基础油的摩擦因数降低了约55.74%,CaCO_(3)粒子使微乳液P_(B)值提高了约10.88%,摩擦面粗糙度降低了约16.01%。在摩擦过程中,胶团在表面活性剂的作用下平行吸附于摩擦面且易于剪切,实现优异的减摩效果;梭形薄片状的CaCO_(3)微纳米粒子可以抑制表面微凸体之间的直接接触,减少黏着磨损与磨粒磨损,从而发挥极压作用并显著改善表面质量。

关键词：微乳液摩擦学性能微纳米流体润滑剂

Structural transition, electric transport, and electronic structures in the compressed trilayer nickelate LaNiO

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Science China(Physics,Mechanics & Astronomy) 2024年

作者： Jingyuan Li Cuiqun Chen Chaoxin Huang Yifeng Han Mengwu Huo Xing Huang Peiyue Ma Zhengyang Qiu Junfeng Chen Xunwu Hu Lan Chen Tao Xie Bing Shen Hualei sun daoxin Yao Meng Wang Center for Materials of the Universe School of Molecular Sciences Arizona State University Center for Neutron Science and Technology Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices School of Physics Sun Yat-sen University School of Sciences Sun Yat-sen University

Atomic structure and electronic band structure are fundamental properties for understanding the mechanism of superconductivity. Motivated by the discovery of pressure-induced high-temperature superconductivity at 80 K in the bilayer Ruddlesden-Popper nickelate La3Ni2O7, the atomic structure and electronic band structure of the trilayer nickelate La4Ni3O10under pressure up to 44.3 GPa are investigated. A structural transition from the monoclinic P21/a space group to the tetragonal I4/mmm around 12.6-13.4 GPa is identified, accompanied by a drop of resistance below 7 K. Density functional theory calculations suggest that the bonding state of Ni 3dz2orbital rises and crosses the Fermi level at high pressures, which may give rise to possible superconductivity observed in resistance under pressure in La4Ni3O10. The trilayer nickelate La4Ni3O10shows some similarities with the bilayer La3Ni2O7and has unique properties, providing a new platform to investigate the underlying mechanism of superconductivity in nickelates.

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超慢速扩张洋中脊的海底地形分段特征研究

科技创新与应用 2023年第21期13卷 28-31页

作者：苏道鑫闫凯暄亢瑞馨孙连泽山东科技大学测绘科学与空间信息学院山东青岛266590 自然资源部第二海洋研究所杭州310012 自然资源部海底科学重点实验室杭州310012

为研究超慢速扩张洋中脊的地形分段特征和中心形态的变化,该文使用多波束水深数据,对西南印度洋中脊(10°-70°E)和加克洋中脊(7°W-102°E)进行二级洋中脊的分段和地形地貌测量,分别划分出71和19个二级洋脊段。测量结果说明,西南印度... 详细信息

为研究超慢速扩张洋中脊的地形分段特征和中心形态的变化,该文使用多波束水深数据,对西南印度洋中脊(10°-70°E)和加克洋中脊(7°W-102°E)进行二级洋中脊的分段和地形地貌测量,分别划分出71和19个二级洋脊段。测量结果说明,西南印度洋中脊和加克洋中脊的岩浆上涌单元间隔、洋脊段沿轴地形起伏变化、中央裂谷宽度和高度的平均值都大于扩张更快的洋中脊。超慢速扩张洋中脊的二级分段长度与沿轴地形起伏呈正相关,岩浆供给强度是扩张中心形态变化的主要控制因素。

关键词：超慢速扩张洋中脊海底地形分段性岩浆供给多波束水深数据