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Extreme single-excitation subradiance from two-band Bloch oscillations in atomic arrays

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Photonics Research 2024年第3期12卷 571-580页

作者： LUOJIA WANG DA-WEI WANG LUQI YUAN YAPING YANG xianfeng chen State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Interdisciplinary Center for Quantum Information and State Key Laboratory of Modern Optical Instrumentation Zhejiang Province Key Laboratory of Quantum Technology and Deviceand School of PhysicsZhejiang UniversityHangzhou 310027China MOE Key Laboratory of Advanced Micro-Structured Materials School of Physics Science and EngineeringTongji UniversityShanghai 200092China Shanghai Research Center for Quantum Sciences Shanghai 201315China Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal UniversityJinan 250358China

Atomic arrays provide an important quantum optical platform with photon-mediated dipole–dipole interactions that can be engineered to realize key applications in quantum information processing.A major obstacle for such applications is the fast decay of the excited *** controlling two-band Bloch oscillations of single excitation in an atomic array under an external magnetic field,here we show that exotic subradiance can be realized and maintained with orders of magnitude longer than the spontaneous decay time in atomic arrays with the finite *** key finding is to show a way for preventing the wavepacket of excited states scattering into the dissipative zone inside the free space light cone,which therefore leads to the excitation staying at a subradiant state for an extremely long decay *** show that such operation can be achieved by introducing a spatially linear potential from the external magnetic field in the atomic arrays and then manipulating interconnected two-band Bloch oscillations along opposite *** results also point out the possibility of controllable switching between superradiant and subradiant states,which leads to potential applications in quantum storage.

关键词： excitation Bloch decay

Enriched photosensitizer for deep-seated-tumor photodynamic therapy

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Photonics Research 2024年第5期12卷 1024-1035页

作者： HONGRUI SHAN XUEQIAN WANG QIHENG WEI HAILANG DAI xianfeng chen State Key Laboratory on Fiber Optic Local Area Communication Networks and Advanced Optical Communication Systems Department of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Metal Matrix Composites Shanghai Key Laboratory for Molecular Engineering of Chiral DrugsSchool of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal UniversityJinan 250358China

Photodynamic therapy(PDT)is an innovative approach that utilizes photochemical reactions for non-invasive disease *** PDT is limited by the low penetration depth of visible light required for ***,we employed upconversion nanoparticles(UCNPs)to extend the activation wavelength of photosensitizers into the infrared range,enabling a treatment depth of over 10 ***,we also used the abundant amino groups of branched polyethyleneimine(PEI)with spatial structure to enhance the loading capacity of protoporphyrin(PPIX),and we ultimately improved skin tumor clearance ***,we achieved tumor-specific treatment by utilizing folic acid(FA)targeting and active enrichment of *** to cellular experimental results,we demonstrated the remarkable reactive oxygen species generation capability of the material and ultra-low dark ***,we investigated the apoptosis mechanism and demonstrated that the synthesized nanoparticle stimulates the up-regulation of apoptosis-associated proteins Bax/Bcl-2 and Cyto *** in vivo experiments involving intravenous injection in mouse tails,we investigated the anticancer efficacy of the nanoparticle,confirming its excellent PDT *** research provides a promising avenue for future non-invasive treatment of deep-seated tumors,offering a method for the treatment and management of specific cancers.

关键词： treatment utilize utilizing

Nonlinear generation of vector beams by using a compact nonlinear fork grating

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Photonics Research 2024年第5期12卷 1036-1043页

作者： QIAN YANG YANGFEIFEI YANG HAO LI HAIGANG LIU xianfeng chen State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Shanghai Research Center for Quantum Sciences Shanghai 201315China

Vectorial beams have attracted great interest due to their broad applications in optical micromanipulation,optical imaging,optical micromachining,and optical *** frequency conversion is an effective technique to expand the frequency range of the vectorial ***,the scheme of existing methods to generate vector beams of the second harmonic(SH)lacks compactness in the ***,we introduce a new way to realize the generation of vector beams of SH by using a nonlinear fork grating to solve such a *** examine the properties of generated SH vector beams by using Stokes parameters,which agree well with theoretical *** we demonstrate that linearly polarized vector beams with arbitrary topological charge can be achieved by adjusting the optical axis direction of the half-wave plate(HWP).Finally,we measure the nonlinear conversion efficiency of such a *** proposed method provides a new way to generate vector beams of SH by using a microstructure of nonlinear crystal,which may also be applied in other nonlinear processes and promote all-optical waveband applications of such vector beams.

关键词： method nonlinear Nonlinear

Application of the CatBoost Model for Stirred Reactor State Monitoring Based on Vibration Signals

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Computer Modeling in Engineering & Sciences 2024年第7期140卷 647-663页

作者： Xukai Ren Huanwei Yu xianfeng chen Yantong Tang Guobiao Wang Xiyong Du School of Mechanical Engineering Tianjin UniversityTianjin300354China Quality Department Shaoxing Key Laboratory of Special Equipment Intelligent Testing and EvaluationShaoxing312071China

Stirred reactors are key equipment in production,and unpredictable failures will result in significant economic losses and safety ***,it is necessary to monitor its health *** achieve this goal,in this study,five states of the stirred reactor were firstly preset:normal,shaft bending,blade eccentricity,bearing wear,and bolt *** signals along x,y and z axes were collected and analyzed in both the time domain and frequency ***,93 statistical features were extracted and evaluated by ReliefF,Maximal Information Coefficient(MIC)and *** above evaluation results were then fused by D-S evidence theory to extract the final 16 features that are most relevant to the state of the stirred ***,the CatBoost algorithm was introduced to establish the stirred reactor health monitoring *** validation results showed that the model achieves 100%accuracy in detecting the fault/normal state of the stirred reactor and 98%accuracy in diagnosing the type of fault.

关键词： Stirred reactor fault diagnosis vibration signal CatBoost

Recent progress in thin-film lithium niobate photonic crystal[Invited]

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Chinese Optics Letters 2024年第3期22卷 142-153页

作者：葛睿吴江威刘翔敏陈玉萍陈险峰 State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China School of Physics Ningxia UniversityYinchuan 750021China Shanghai Research Center for Quantum Sciences Shanghai 201315China Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal UniversityJinan 250358China

Lithium niobate is a material that exhibits outstanding electro-optic,nonlinear optical,acousto-optic,piezoelectric,photorefractive,and pyroelectric properties.A thin-film lithium niobate photonic crystal can confine light in the sub-wavelength scale,which is beneficial to the integration of the lithium niobate on-chip *** commercialization of the lithium niobate on insulator gives birth to the emergence of high-quality lithium niobate photonic *** order to provide guidance to the research of lithium niobate photonic crystal devices,recent progress about fabrication,characterization,and applications of the thin-film lithium niobate photonic crystal is *** performance parameters of the different devices are compared.

关键词： lithium niobate photonic crystal integrated optics

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散射光场调控方法及应用(特邀)

光学学报 2024年第10期44卷 92-113页

作者：倪枫超刘海港陈险峰区域光纤通信网与新型光通信系统国家重点实验室上海交通大学物理与天文学院上海200240 上海量子科学研究中心上海201315

波前整形方法通过改变入射光的相位模式分布来补偿由散射引起的相位畸变,使散射光子可以被有效地利用,从而实现散射光场调控。通过散射光场调控可以将有害的散射介质变成可控的光学元件,实现光的定向传输、动态检测等功能,为其在各领域... 详细信息

波前整形方法通过改变入射光的相位模式分布来补偿由散射引起的相位畸变,使散射光子可以被有效地利用,从而实现散射光场调控。通过散射光场调控可以将有害的散射介质变成可控的光学元件,实现光的定向传输、动态检测等功能,为其在各领域中的应用提供了一种强大的工具。本文在介绍光场散射特性及其调控方法原理的基础上,介绍了散射光场空间、偏振、频率、能量和轨道角动量等自由度的调控方法,随后重点介绍了散射光场调控在成像、通信、非线性光学、量子光学、光学检测、集成光学和光计算等领域的最新研究进展。

关键词：物理光学散射光场调控波前整形传输矩阵

考虑碳排放的危险品运输异构车辆路径问题研究

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中国安全科学学报 2024年第1期34卷 193-199页

作者：马天明黄楚原陈先锋武汉理工大学安全科学与应急管理学院湖北武汉430070

为满足危险品运输异构车辆路径问题(HVRP)的低碳需求,对易爆危险品运输过程中的总风险、总成本和总碳排放量进行最优化处理。首先,在模型构造阶段,改进总成本与总风险的度量方式,包括建立爆炸事故场景下考虑危险品装载量的风险量化模型... 详细信息

为满足危险品运输异构车辆路径问题(HVRP)的低碳需求,对易爆危险品运输过程中的总风险、总成本和总碳排放量进行最优化处理。首先,在模型构造阶段,改进总成本与总风险的度量方式,包括建立爆炸事故场景下考虑危险品装载量的风险量化模型,并设计一种用于惩罚成本计算的软时间窗函数,该函数可以优先减少装载量较大的车辆在客户处的等待时间;然后,在算法改良阶段从2方面改进非支配排序遗传算法(NSGA-Ⅱ),设计一种带有改良交叉算子的混合交叉方法来提升全局搜索效率,并通过包含2个阶段的变邻域搜索(VNS)算法来提高局部搜索能力;最后,通过算例验证模型和算法的有效性。研究结果表明:相较于原始NSGA-Ⅱ,改进的算法收敛曲线下降更快,使总成本、总风险和总碳排放量3个优化目标的平均值进一步减少3.36%、12.16%和6.96%;在车辆数目有限的车队中,承运人可以通过选择不同的车辆类型对各目标产生不同程度的影响。

关键词：碳排放危险品异构车辆路径问题(HVRP) 多目标优化非支配排序遗传算法(NSGA-Ⅱ)

Broadband second-harmonic generation in thin-film lithium niobate microdisk via cyclic quasi-phase matching

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Chinese Optics Letters 2024年第3期22卷 118-122页

作者：朱杰夫丁婷婷孙雪芮倪枫超黎浩刘时杰郑远林陈险峰 State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China School of Electronic and Electrical Engineering Shanghai University of Engineering ScienceShanghai 201620China Shanghai Research Center for Quantum Sciences Shanghai 201315China Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal UniversityJinan 250358China

Whispering-gallery-mode(WGM)microresonators can greatly enhance light-matter interaction,making them indispensable units for frequency conversion in nonlinear *** nonlinear wave mixing in microresonators requires stringent simultaneous optical resonance and phase-matching ***,it is challenging to achieve efficient frequency conversion over a broad ***,we demonstrate broadband second-harmonic generation(SHG)in the x-cut thinfilm lithium niobate(TFLN)microdisk with a quality factor above 107by applying the cyclic quasi-phase-matching(CQPM)mechanism,which is intrinsically applicable for broadband *** SHG of continuous-wave laser with a maximum normalized conversion efficiency of~15%/m W is achieved with a bandwidth spanning over 100 nm in the telecommunication ***,broadband SHG of femtosecond lasers,supercontinuum lasers,and amplified spontaneous emission in the telecommunication band is also experimentally *** work is beneficial for integrated nonlinear photonics devices like frequency converters and optical frequency comb generator based on second-order nonlinearity on the TFLN platform.

关键词： lithium niobate whispering-gallery mode broadband second-harmonic generation cyclic quasi-phase matching

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适温离子交换掺铒铌酸锂薄膜的制备研究

人工晶体学报 2024年第3期53卷 441-448页

作者：何雨轩吴江威陈玉萍陈险峰上海交通大学物理与天文学院区域光纤通信网与新型光通信系统国家重点实验室上海200240 宁夏大学物理学院银川750021 山东师范大学光场调控及应用协同创新中心济南250358 上海量子科学研究中心上海201315

本文通过制备KNO_(3)和Er(NO_(3))_(3)熔融混合物,将其与铌酸锂薄膜在高温管式炉中混合进行适温热扩散,并结合退火工艺,发明了一种直接在铌酸锂薄膜上掺杂Er^(3+)的方法。通过不断变换热扩散温度、掺杂试剂浓度比例和晶体切向等参数,用... 详细信息

本文通过制备KNO_(3)和Er(NO_(3))_(3)熔融混合物,将其与铌酸锂薄膜在高温管式炉中混合进行适温热扩散,并结合退火工艺,发明了一种直接在铌酸锂薄膜上掺杂Er^(3+)的方法。通过不断变换热扩散温度、掺杂试剂浓度比例和晶体切向等参数,用控制变量法探究了不同参数对适温离子交换法掺杂Er^(3+)效果的影响,在热扩散和退火温度360℃及KNO_(3)和Er(NO_(3))_(3)质量比25∶1的参数设置下获得了表面形貌较佳的Z切掺铒铌酸锂薄膜。通过飞行时间二次离子质谱仪并利用已知掺杂浓度的薄膜进行定标,检测了所获得的掺铒铌酸锂薄膜中的Er^(3+)浓度情况,对所采用适温离子交换法的有效性进行了验证。这一方法大幅简化了铌酸锂薄膜掺杂的工艺,同时节约了成本,有助于后续在铌酸锂薄膜平台上实现分区掺杂的工作,为未来定制化铌酸锂光子集成平台的搭建提供参考。

关键词：铌酸锂薄膜 Er^(3+) 适温离子交换二次离子质谱仪