1 深圳技术大学未来技术学院先进制造与未来工业中心，广东 深圳 518118
2 哈尔滨工程大学物理与光电工程学院纤维集成光学教育部重点实验室，黑龙江 哈尔滨 150001
3 桂林电子科技大学光电工程学院光子学研究中心，广西 桂林 541004
随着微流控技术的日趋成熟，将微流控芯片技术和光微流方法在微结构光纤中进行交叉融合，已经逐渐形成了一个新的发展方向。简要综述了这一技术是如何从初期的利用微结构光纤的特殊结构，进行简单的功能集成，拓展到如今基于特殊需求进行光纤的功能设计的新阶段，以实现在微结构光纤内部构造微流控感测系统的目的。该方向的发展，不仅促进了光波导与微流物质检测技术相结合，还为实现不同检测原理在微结构光纤内的高灵敏度光纤微流传感器技术开辟了新方法与新途径。
微流控 光微流 光纤传感器 光微流传感器 激光与光电子学进展
2024, 61(1): 0106004
1 北京理工大学光电学院北京市混合现实与新型显示工程技术研究中心，北京 100081
2 北京理工大学光电学院光电成像技术与系统教育部重点实验室，北京 100081
3 北京理工大学光电学院信息光子技术工信部重点实验室，北京 100081
超表面器件的亚波长单元结构能够与光产生强烈的相互作用。通过对超原子的优化设计，能够对光场的各个参量进行多维度调控，为包括全息显示在内的众多应用光学领域带来全新的解决思路与方案。针对全息显示中核心光电调制器件能力有限的问题，发挥超表面器件超强的光场控制能力，利用多维度的复用调控，实现对信息通道数量的扩展，提升显示质量与效果。随着对超表面光场调控机制与复用技术的深入研究，超表面自身与相关应用领域都得到了长足发展。本文围绕超表面进行论述，着重介绍本课题组在多维度超表面的光场调控及全息显示中的研究进展。
超表面 光场调控 多维度 全息显示 光学学报
2023, 43(15): 1524001
1 中北大学信息与通信工程学院, 山西 太原 030051
2 中国特种设备检测研究院, 北京 100029
3 中国航发沈阳黎明航空发动机有限责任公司, 辽宁 沈阳 110000
为对工件表面产生的倾斜微裂纹进行检测, 从理论上和试验上分析激光产生的宽带瑞利波与矩形铝板上的倾斜角缺陷之间的相互作用。使用瑞利波与倾斜裂纹相互作用产生的透射波、反射波以及在裂纹尖端产生的绕射波来对裂纹角度进行定量检测。通过观察有限元仿真的应力云图, 发现瑞利波沿缺陷传播, 在缺陷尖端处发生模态转换, 有一部分波沿着裂纹绕射到金属表面, 部分波反射, 还有部分转换成纵波和横波。通过对绕射波信号进行傅里叶变换, 得到频谱图并观察绕射波在频域的变化趋势, 对绕射波能量进行计算, 最终得到绕射波能量随缺陷角度增大而减小, 呈e指数衰减分布。将有限元仿真与试验相结合, 结果表明, 当表面缺陷与表面呈一定倾角时, 绕射波能量提取是检测表面裂纹倾斜角的一种有效的方法。
激光超声 无损检测 有限元仿真 斜裂纹 laser ultrasonic nondestructive testing finite element simulation oblique crack
1 吉林省教育学院，吉林 长春 130022
2 吉林大学 仪器科学与电气工程学院 地球物理勘探装备教育部重点实验室，吉林 长春 130061
在现代医学中，核扫描、正电子发射断层扫描( Positron Emission Tomography, PET) 和磁共振成像(Magnetic Resonance Imaging, MRI)技术已被广泛应用于提供组织形态和功能信息。但是这些技术在分辨率或成像深度上各有缺点，而一种基于低相干干涉原理的新型光学检测技术则可以同时实现高分辨率和大深度成像，该技术称为光学相干层析成像技术(Optical Coherence Tomography，OCT)。OCT技术是一种将高纵向分辨率和高横向分辨率结合的非接触、非侵入、无损伤影像技术，可以实现与活体组织病理学观察相同的作用。OCT采用低能量的近红外光源作为探测光，并结合显微镜头、手持式探头或内窥镜等非损伤方式进行常规检测，不会对生物组织造成损伤。同时OCT结合发展迅速的图像采集分析处理技术，可实现实时三维成像，从中提取对诊断有用的信息进行定量分析，为医生的诊断提供便利。该综述重点介绍经典OCT成像技术及其相关医疗应用技术，如SD-OCT、SS-OCT、aOCT、PS-OCT和D-OCT，在呼吸系统、口腔、脑组织和肾脏等其他主要器官疾病检测中的应用。
光学相干层析成像 呼吸系统 气道疾病 口腔癌 optical coherence tomography respiratory system airway diseases oral cancer 红外与激光工程
2022, 51(10): 20210803
Author Affiliations
Abstract
1 Key Laboratory of In-Fiber Integrated Optics, Ministry of Education, College of Physics and Optical Engineering, Harbin Engineering University, Harbin 150001, China
2 Photonics Research Center, School of Electric Engineering and Automation, Guilin University of Electronics Technology, Guilin 541004, China
By using a specialty optical fiber, a series of powerful microparticle manipulation tools, including optical tweezers, a micro-optical hand, and an optical gun, are developed and demonstrated. In this paper, a review of our research activities on the optical manipulation of microparticles is presented. In particular, we will describe a kind of specialty optical fiber designed and fabricated for building optical trapping and manipulating tools. The performances of annular core fiber-based optical tweezers, a multicore fiber-based micro-optical hand, and a coaxial dual waveguide fiber-based optical gun are demonstrated as examples of applications and discussed in detail. The fiber can be used in cell manipulation in life science and drug response in medicine.
060.2310 Fiber optics 350.4855 Optical tweezers or optical manipulation 140.7010 Laser trapping Chinese Optics Letters
2019, 17(9): 090603
1 上海海洋大学信息学院, 上海 201306
2 上海电力大学, 上海 200090
由于高光谱图像具有波段多、波段间信息冗余、空间信息相关等特点,提出一种考虑空间相关性的半监督局部保持投影(LPP)的高光谱图像特征提取算法(LPP-SCSSFE)。该算法利用保存高光谱图像空间近邻结构的空间距离,及保持图像光谱相似性的类内判别权值和类间判别权值,定义新的同物异谱、同谱异物像元权值计算函数,结合LPP提取高光谱图像特征,从而最大化同类地物间的相似性和异类地物间的差异性。在Indian Pines和Pavia University两个数据集上,通过高光谱图像分类实验对本文提出的LPP-SCSSFE算法进行验证,算法最高总体分类精度分别达到87.50%和91.29%,优于现有的特征提取算法。结果表明,本文算法充分考虑高光谱图像的空间相关性和光谱相似性,能够有效提取出有代表性的特征,提高分类精度。
图像处理 特征提取 局部保持投影 高光谱图像 半监督 空间相关性 激光与光电子学进展
2019, 56(2): 021003
Author Affiliations
Abstract
1 Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication, Shanghai Institute for Advanced Communication and Data Science, Shanghai University, Shanghai 200444, China
2 The Key Laboratory of In-Fiber Integrated Optics, Ministry of Education, College of Science, Harbin Engineering University, Harbin 150001, China
3 School of Electronic Engineering and Automation, Guilin University of Electronic Technology, Guilin 541000, China
4 Department of Electrical and Computer Engineering, Clemson University, Clemson, South Carolina 29634, USA
We propose and demonstrate a tapered hollow annular core fiber (HACF) coupler for excitation of whispering-gallery modes (WGMs) of an embedded microsphere resonator. The coupler is simply fabricated by fusion splicing of a segment of HACF with the single-mode fiber (SMF), and then improved by tapering the splicing joint to reduce the cone-apex angle. Therefore, the coupling efficiency from the SMF to the HACF is enhanced to excite various WGMs via evanescent field coupling. Normal positive, negative symmetrical Lorentzian and asymmetric Fano line shapes can be obtained by varying the resonator size and location. Another interesting phenomenon is observed that a higher Q-factor mode in a lower Q-factor mode has a contrast as high as 58. Temperature sensing with good stability is also demonstrated. This embedded WGM microsphere resonator in the tapered HACF is expected to promote environmental adaptability in practical applications due to its simplicity and robustness.
Photonics Research
2018, 6(12): 12001124
Author Affiliations
Abstract
1 Key Laboratory of In-Fiber Integrated Optics, Ministry of Education, College of Science, Harbin Engineering University, Harbin 150001, China
2 Photonics Research Center, School of Electric Engineering and Automation, Guilin University of Electronics Technology, Guilin 541004, China
In-fiber integrated optics is an attempt to use silica fiber as a substrate, integrating various optical paths or optical components into a single fiber, to build a functional optical device or component, and to realize a micro optical system, achieving various functions. In-fiber integrated optics is expected to be a new branch of photonics integration. This integration technique enables convenient light beams control and manipulation inside in one fiber. It also provides a research platform with micro and nano scale for interaction between light wave and microfluidic materials. In this review, we briefly summarize the main ideas and key technologies of the in-fiber integrated optics by series integration examples.
060.2310 Fiber optics 060.4005 Microstructured fibers 130.3120 Integrated optics devices Chinese Optics Letters
2018, 16(11): 110601
Author Affiliations
Abstract
1 School of Computer and Communication Engineering, University of Science and Technology Beijing, Beijing 100083, China
2 Beijing Engineering Research Center of Industrial Spectrum Imaging, Beijing 100083, China
3 School of Automation and Electrical Engineering, University of Science and Technology Beijing, Beijing 100083, China
We present a specific-window method to subtract the interference of water vapor on terahertz frequency-domain spectroscopy (THz-FDS) at ambient temperature and pressure. A continuous-wave spectrometer based on photomixing was utilized to obtain THz-FDS of methanol vapor in the range of 50–1200 GHz. The distinctly spaced absorption features in the neighborhood of atmospheric windows of transparency were selected to perform linear fitting versus the calculated absorption cross section and obtain the concentration of methanol. Furthermore, the gradually decreased methanol vapor was quantified to demonstrate the reliability of the method.
300.6495 Spectroscopy, teraherz 300.6390 Spectroscopy, molecular 300.1030 Absorption Chinese Optics Letters
2018, 16(10): 103001
1 中国文化遗产研究院,北京 100029
2 新疆龟兹研究院,新疆 拜城 842313
利用显微镜、扫描电镜和激光拉曼光谱技术对库木吐喇石窟壁画铅颜料进行分析,结果显示棕黑色颜料是二氧化铅和铅丹,橘红色和棕红色颜料是铅丹。采用拉曼光谱检测铅颜料,选择恰当的激光波长和检测功率是获取准确分析结果的关键,较长的激光波长和低的功率能确保铅颜料稳定。研究还发现了石窟壁画颜料铅丹的变色现象。
拉曼光谱 石窟壁画 铅颜料 变色 Raman spectroscopy grotto murals lead pigments discoloration
