1 中国人民公安大学侦查学院，北京 100038
2 北京鉴知技术有限公司，北京 100084
建立了一种快速检验口红的方法，并利用拉曼光谱技术结合X射线荧光光谱法对28个口红样品进行了分类研究。利用拉曼光谱技术对样品进行分析测试，根据拉曼特征峰的不同可以有效地对其进行分类；利用主成分分析对数据进行处理，降维后的数据可解释全部信息的97.545%，结合Pearson相关性分析，验证了根据拉曼特征峰分类的科学性；结合X射线荧光光谱法对两类样品分组，根据Ca/Ti进行组内区分。结果表明，此方法简便快速、操作简单，且无需特殊的前处理，为公安机关侦查破案提供了一种新思路，在公安实践工作中有广阔的应用前景。
光谱学 拉曼光谱 X射线荧光 化学计量学 口红 激光与光电子学进展
2023, 60(1): 0130001
1 中国科学技术大学 中国科学院量子信息重点实验室，安徽 合肥 230026
2 中国科学技术大学 中国科学院量子信息和量子物理协同创新中心，安徽 合肥 230026
具有高品质因子（Q 值）的光学谐振腔能够长时间将光束缚在较小的模式体积内，极大地增强了光与物质的相互作用，成为集成光学器件中具有重大潜力的重要组成部分。聚焦于目前广泛应用于集成非线性光学领域的氮化硅材料平台，为了解决大尺寸氮化硅微环腔由拼接误差、表面粗糙等因素导致的散射损耗较大的问题，进行了一系列的工艺改进以提高大尺寸氮化硅微环腔的品质因子。结果表明：通过薄膜再沉积工艺可以有效降低氮化硅波导的散射损耗，半径为560 μm的大尺寸氮化硅微环腔的本征Q值得到了平均26% 的提升。得益于提高的微腔Q 值，在氮化硅微环腔中实现了重复频率40 GHz 的光学频率梳。
氮化硅微环腔 品质因子 光学频率梳 silicon nitride microring resonator quality factor optical frequency comb 红外与激光工程
2022, 51(5): 20220302
Author Affiliations
Abstract
1 CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China
2 CAS Center For Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
3 Center for Micro and Nanoscale Research and Fabrication, University of Science and Technology of China, Chinese Academy of Sciences, Hefei 230026, China
The microresonator-based soliton microcomb has shown a promising future in many applications. In this work, we report the fabrication of high quality (Q) microring resonators for soliton microcomb generation. By developing the fabrication process with crack isolation trenches and annealing, we can deposit thick stoichiometric film of 800 nm without cracks in the central area. The highest intrinsic Q of the microring obtained in our experiments is about , corresponding to a propagation loss as low as 0.058 dBm/cm. With such a high Q film, we fabricate microrings with the anomalous dispersion and demonstrate the generation of soliton microcombs with 100 mW on-chip pump power, with an optical parametric oscillation threshold of only 13.4 mW. Our integrated chip provides an ideal platform for researches and applications of nonlinear photonics and integrated photonics.
silicon nitride microresonator optical frequency comb dissipative Kerr soliton Chinese Optics Letters
2022, 20(3): 032201
1 暨南大学 光电工程系, 广东 广州 510632
2 广东省可见光通信工程技术研究中心, 广东 广州 510632
3 广州市可见光通信工程技术重点实验室, 广东 广州 510632
室内停车场是静态交通的一个重要组成部分, 由于缺乏有效的室内定位技术, 目前存在着泊车导航以及反向寻车困难的问题。提出一种基于LED照明灯光的可见光室内停车场定位导航系统, 实现了面向车辆的停车位引导和面向行人的反向寻车导航, 具有定位速度快、定位精度高和"照明定位两用"的优势。实验结果及现场测试表明: 该系统定位精度可达到7.5 cm, 可支持车辆或行人在时速达17 km/h下的实时定位导航。
可见光通信 停车系统 室内定位 LED照明定位两用灯 visible light communication parking system indoor positioning LED lighting and positioning dual use
中国石油大学(华东)机电工程学院, 山东 青岛 266580
利用有限元分析软件SYSWELD建立了三维有限元模型, 对不同预热温度下激光熔覆铁基涂层的过程进行了数值模拟, 分析了不同预热温度下温度场和组织转变的变化规律, 研究了冷却速度和组织转变对残余应力场的影响。结果表明, 预热温度越高, 熔覆层中心的峰值温度越高, 同时能有效降低熔覆层冷却速度。预热温度在20～300 ℃范围内时, 随着预热温度的增加, 熔覆层贝氏体含量逐渐增加, 铁素体和马氏体含量逐渐减少, 使得熔覆层残余应力增大; 预热温度高于300 ℃以后, 随预热温度增加冷却速度显著降低, 组织中铁素体含量逐渐增加, 贝氏体含量逐渐减少, 残余应力随之减小。
激光熔覆 数值模拟 组织转变 温度场 残余应力 laser cladding numerical simulation microstructural transformation temperature field residual stress
新疆大学 物理科学与技术学院, 乌鲁木齐 830046
利用溶胶-凝胶工艺在ITO/玻璃衬底上制备了Bi1-xGdxFeO3(x=0.00、0.05、0.10和0.15)薄膜。研究了Gd掺杂对薄膜的结构、形貌、漏电流性能和介电性能的影响。结果显示, 未掺Gd和Gd掺杂为5%的样品为菱方结构, 当Gd掺杂量达到10%和15%时, 样品变为四方结构。掺10%Gd的薄膜样品表面光滑、平整, 晶粒大小均匀。Gd的掺入大大降低了BiFeO3(BFO)薄膜的漏电流, 其中掺Gd量为10%和15%的薄膜的漏电流几乎为零。在整个测试频率范围内, 掺10%Gd的样品的介电常数较大且能保持恒定, 同时其介电损耗最小。
铁酸铋 Gd掺杂 溶胶-凝胶法 漏电流 介电 Bismuth Ferrite Gd-doping Sol-Gel method leakage current dielectric
Author Affiliations
Abstract
1 Advanced Photonics Center, Southeast University, Nanjing 210096, China
2 Clinical Laboratory Center of the First Affiliated Hospital of Nanjing Medical University, Nanjing 210011, China
A novel drug carrier based on SiO2-coated silver nanoparticle aggregates and antitumor drug is successfully synthesized. The surface-enhanced Raman scattering (SERS) spectra of the antitumor drug in living cells are obtained. By using silver nano-aggregates as SERS substrates instead of dispersed silver particles, a great improvement of SERS signal intensity is achieved. It is found that the chemical stability of the drug carrier can also be increased with the existence of SiO2 shell. The adsorbing effect between antitumor drug 9-aminoacridine (9AA) and silver particles is investigated to optimize the SERS signal. The core/shell structure of the drug carrier is characterized by ultraviolet-visible (UV-Vis) spectroscopy and transmission electron microscopy (TEM) pictures. The experimental results show that the drug carrier offers biocompatibility, stability, and high SERS activity, holding the potential for realizing the intracellular drug tracing.
银纳米聚集体 表面增强拉曼散射 药物载体 160.4236 Nanomaterials 290.5860 Scattering, Raman 170.5660 Raman spectroscopy Chinese Optics Letters
2010, 8(4): 357
Author Affiliations
Abstract
1 Advanced Photonics Center, Southeast University, Nanjing 210096, China
2 Clinical Laboratory Center of the First Affliated Hospital of Nanjing Medical University, Nanjing 210006, China
Optical methods and MTT method are used to characterize the antiproliferation effect of antitumor drug 9-aminoacridine (9AA) with and without silver nanoparticles. Intracellular surface enhanced Raman scattering (SERS) spectra and fluorescent spectra of 9AA indicate the form of 9AA adsorbed on the surface of silver nanoparticles. Although both silver nanoparticles and antitumor drug can inhibit the growth of Hela cells, silver nanoparticles can slow down the antiproliferation effect on Hela cells at low concentration of antitumor drugs. Our experimental results suggest that silver nanoparticles may serve as slow-release drug carriers, which is important in antitumor drug delivery.
银纳米 表面增强拉曼散射 药物 160.4236 Nanomaterials 290.5860 Scattering, Raman 180.1790 Confocal microscopy Chinese Optics Letters
2009, 7(10): 894
