邹萌 1,2肖何 1,2宋青果 1,2肖翔鹏 1,2[ ... ]闫志君 1,2,*
作者单位
摘要
1 华中科技大学光学与电子信息学院,湖北 武汉 430074
2 华中科技大学无锡研究院,江苏 无锡 214174
随着激光雷达、引力波探测和光学原子钟等新技术的兴起和研究的不断深入,光学精密测量覆盖的应用领域的广度和深度都在拓展,传统自由运转的激光器其稳定性难以满足高精密测量的应用要求。超窄线宽、超低噪声和长期稳定的光源已成为该领域迫切追求的目标。光纤激光器具备结构紧凑、易于集成化和极限线宽窄等特点,通过噪声抑制和稳频技术输出超稳定、超窄线宽激光,近年来逐渐成为热点研究方向。本文从光纤激光器的噪声理论出发,介绍了光纤激光器的噪声来源、分类及测试方法,基于噪声理论,分类总结了光纤激光器强度噪声和频率噪声不同抑制技术的原理、发展历程及现阶段进展,并对窄线宽光纤激光器的发展趋势做了展望。
激光器 超窄线宽激光 光纤激光器 噪声抑制 稳频技术 lasers ultra-narrow linewidth laser fiber laser noise suppression frequency stabilization technology 
激光与光电子学进展
2023, 60(15): 1500002
Yuxiang Chen 1†Fengyu Zhang 2,4†Zhibo Dang 1Xiao He 1[ ... ]Zheyu Fang 1,3,*
Author Affiliations
Abstract
1 School of Physics, Peking University, Beijing 100871, China
2 The State Key Laboratory for Artificial Microstructures and Mesoscopic Physics, School of Physics & Center for Quantitative Biology, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China
3 Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China
4 Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou 325001, China
Chirality plays an important role in biological processes, and enantiomers often possess similar physical properties and different physiologic functions. In recent years, chiral detection of enantiomers become a popular topic. Plasmonic metasurfaces enhance weak inherent chiral effects of biomolecules, so they are used in chiral detection. Artificial intelligence algorithm makes a lot of contribution to many aspects of nanophotonics. Here, we propose a nanostructure design method based on reinforcement learning and devise chiral nanostructures to distinguish enantiomers. The algorithm finds out the metallic nanostructures with a sharp peak in circular dichroism spectra and emphasizes the frequency shifts caused by nearfield interaction of nanostructures and biomolecules. Our work inspires universal and efficient machine-learning methods for nanophotonic design.
chiral detection metasurface deep learning cathodoluminescence 
Opto-Electronic Science
2023, 2(1): 220019
Author Affiliations
Abstract
School of Physics, State Key Lab for Mesoscopic Physics, Academy for Advanced Interdisciplinary Studies, Collaborative Innovation Center of Quantum Matter, Yangtze Delta Institute of Optoelectronics, and Nano-optoelectronics Frontier Center of Ministry of Education, Peking Universityhttps://ror.org/02v51f717, Beijing 100871, China
The manipulation of polarization states beyond the optical limit presents advantages in various applications. Considerable progress has been made in the design of meta-waveplates for on-demand polarization transformation, realized by numerical simulations and parameter sweep methodologies. However, due to the limited freedom in these classical strategies, particular challenges arise from the emerging requirement for multiplex optical devices and multidimensional manipulation of light, which urge for a large number of different nanostructures with great polarization control capability. Here, we demonstrate a set of self-designed arbitrary wave plates with a high polarization conversion efficiency. We combine Bayesian optimization and deep neural networks to design perfect half- and quarter-waveplates based on metallic nanostructures, which experimentally demonstrate excellent polarization control functionalities with the conversion ratios of 85% and 90%. More broadly, we develop a comprehensive wave plate database consisting of various metallic nanostructures with high polarization conversion efficiency, accompanying a flexible tuning of phase shifts (02π) and group delays (0–10 fs), and construct an achromatic metalens based on this database. Owing to the versatility and excellent performance, our self-designed wave plates can promote the performance of multiplexed broadband metasurfaces and find potential applications in compact optical devices and polarization division multiplexing optical communications.
Photonics Research
2023, 11(5): 695
Author Affiliations
Abstract
1 School of Physics, State Key Lab for Mesoscopic Physics, Academy for Advanced Interdisciplinary Studies, Collaborative Innovation Center of Quantum Matter, and Nano-optoelectronics Frontier Center of Ministry of Education, Peking University Yangtze Delta Institute of Optoelectronics, Peking University, Beijing 100871, China
2 National Laboratory of Solid State Microstructures, Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, China
3 College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
4 Department of Physics and HKU-UCAS Joint Institute for Theoretical and Computational Physics at Hong Kong, the University of Hong Kong, Pokfulam Road, Hong Kong, China
Photonic topological insulators with robust boundary states can enable great applications for optical communication and quantum emission, such as unidirectional waveguide and single-mode laser. However, because of the diffraction limit of light, the physical insight of topological resonance remains unexplored in detail, like the dark line that exists with the crystalline symmetry-protected topological edge state. Here, we experimentally observe the dark line of the Z2 photonic topological insulator in the visible range by photoluminescence and specify its location by cathodoluminescence characterization, and elucidate its mechanism with the p-d orbital electromagnetic field distribution which calculated by numerical simulation. Our investigation provides a deeper understanding of Z2 topological edge states and may have great significance to the design of future on-chip topological devices.
photonic topological insulator edge state cathodoluminescence TMDC 
Opto-Electronic Advances
2022, 5(4): 210015
Author Affiliations
Abstract
School of Physics, State Key Laboratory for Mesoscopic Physics, Academy for Advanced Interdisciplinary Studies, Collaborative Innovation Center of Quantum Matter, and Nano-optoelectronics Frontier Center of Ministry of Education, Peking University, Beijing 100871, China
Quantum information technology requires bright and stable single-photon emitters (SPEs). As a promising single-photon source, SPEs in layered hexagonal boron nitride (hBN) have attracted much attention recently for their high brightness and excellent optical stability at room temperature. In this review, the physical mechanisms and the recent progress of the quantum emission of hBN are reviewed, and the various techniques to fabricate high-quality SPEs in hBN are summarized. The latest development and applications based on SPEs in hBN in emerging areas are discussed. This review focuses on the modulation of SPEs in hBN and discusses possible research directions for future device applications.
quantum emission single-photon emitter hexagonal boron nitride two-dimensional materials quantum nanophotonics 
Chinese Optics Letters
2022, 20(3): 032701
作者单位
摘要
1 中国工程物理研究院电子工程研究所,四川绵阳 621999
2 西华师范大学计算机学院,四川南充 637009
3 电子科技大学自动化工程学院,四川成都 611731
提出一种基于射频 (RF)能量采集的认知无线电网络 (CRN)架构。次用户 (SU)消耗的总能量必须等于或小于采集的总能量,以保护主用户 (PU)不受干扰。在满足次用户的服务质量前提下,确定在射频能量采集认知无线网络中最大化能效的最优传输时间和功率分配。在能效最大化过程中,引入吞吐量约束,找到服务质量和能源消耗之间的平衡。能效优化是一个非线性分式规划问题,使用坐标上升将其分成 2个子问题,即给定传输时间下的功率分配与给定功率分配下的传输时间选择,然后使用 Charnes-Cooper变形方法将非凸问题转化为一个等价凹问题。仿真结果表明,该方案能够实现有效的能效优化。
能量效率 认知无线电 能量采集 能量因果关系 吞吐量约束 Energy Efficiency cognitive radio energy harvesting underlay energy causality throughput constraint 
太赫兹科学与电子信息学报
2020, 18(3): 397
作者单位
摘要
江西中医药大学基础医学实验中心, 江西 南昌 330004
为了研究太赫兹波辐射对小鼠造血功能的影响,采用正交设计实验方法,选择太赫兹波的三个挡位对小鼠进行不同辐照天数和辐照时长的全身照射(辐照),检测小鼠的外周血常规、胸腺指数和脾脏指数,并取骨髓有核细胞测定有核细胞数和集落形成能力,以评估骨髓功能。研究结果显示:太赫兹波照射天数为主要影响因素;随着太赫兹波照射天数增加,红细胞、血红蛋白的含量明显增加,骨髓细胞粒单系克隆形成能力增强,脾脏指数减小。太赫兹波不仅影响造血功能,而且在生物医学的各方面都受到了广泛关注,其产生的生物效应亦有待进一步深入研究。
生物光学 小鼠 太赫兹波 造血功能 三因素三水平 biotechnology mouse terahertz wave hemopoietic function three-factor three-level 
激光与光电子学进展
2020, 57(13): 131702
作者单位
摘要
1 昆明理工大学材料科学与工程学院, 云南 昆明 650093
2 昆明理工大学分析测试研究中心, 云南 昆明 650093
3 首都师范大学北京市纳米光电子学重点实验室, 北京 100048
采用固相法分别在1 150, 1 250, 1 350, 1 450 ℃下制备了Ca(1-x)Al2Si2O8∶Eux(x=0, 0.01, 0.05, 0.15)系列微晶材料。 通过X射线衍射仪(XRD)、 拉曼光谱仪(Raman)、 光致发光光谱仪(PL)和X射线荧光光谱仪(XRF)研究了CaAl2Si2O8表面结构与荧光强度之间的相互关系。 XRD和Raman结果表明: 在制备CaAl2Si2O8材料的过程中, 随着温度不断升高, 原材料逐渐结晶形成结构较为完整的CaAl2Si2O8相; 并且从拉曼光谱可以清晰看出, 当Eu掺杂量相同时, 随着烧结温度的升高, Si—O非晶相逐渐减少, 硅氧四面体逐步形成, 其振动峰位置逐渐向低波数移动, 但当温度过高时硅氧四面体破坏形成宽化的的非晶峰; Eu的掺杂阻碍了Al取代Si位置的过程, 因此在1 620波数处振动峰先增强后减弱。 这种材料表面结构的变化与Eu的掺杂密切相关, 影响着材料表面Eu原子数量分布。 PL和XRF结果表明: 相同Eu掺杂量时, 温度越高越有利于Eu原子扩散到样品表面, 从而使样品的荧光强度更强。 因此样品的荧光强度和样品单位表面积Eu原子数量存在正比关系。
拉曼光谱 硅(铝)氧四面体 X荧光光谱 荧光强度 CaAl2Si2O8 CaAl2Si2O8 Raman spectroscopy Silicon (aluminum) oxygen tetrahedron X-ray fluorescence spectroscopy Fluorescence intensity 
光谱学与光谱分析
2016, 36(1): 146
作者单位
摘要
南京航空航天大学,南京 210016
主要研究空空导弹的末制导问题。简单研究了三维比例导引律,基于Terminal 滑模控制方法提出一种新型的三维末制导律,并分析了它的不足,在此基础上进行改进,从而提出基于RBF 神经网络的自适应快速终端滑模(AFTSM)制导律。该制导律在非线性系统的精确模型未知的情况下,通过RBF神经网络对非线性模型进行逼近,并根据Lyapunov方法设计了参数自适应律。最后对所研究的导引律在目标机动情况下进行仿真验证,仿真结果表明,该制导律与比例制导相比有较大的性能改善。
空空导弹 末制导 神经网络 TSMC滑模 air-to-air missile terminal guidance neural network terminal sliding mode 
电光与控制
2009, 16(9): 13
作者单位
摘要
南京航空航天大学 自动化学院模式识别与智能控制实验室,南京 210016
考虑到导弹-目标追逃模型中存在的非线性和不确定性等特点,首先建立在三维坐标系下的反舰巡航导弹-目标的相对运动方程,采用基于零化导弹目标视线角速率的思想,同时把目标机动看成一类有界干扰,应用动态逆方法设计了一种三维末制导律,这种控制方法可以很好地解决系统中存在的强的非线性和不确性因素。仿真结果表明该制导律能够打击机动目标且脱靶量较小,具有较强的鲁棒性。
反舰巡航导弹 非线性 动态逆 末制导律 鲁棒性 anti-ship cruise missile nonlinearity dynamic inversion terminal guidance law robustness 
电光与控制
2009, 16(8): 19

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