1 哈尔滨工业大学物理学院, 黑龙江 哈尔滨 150001
2 哈尔滨工业大学(威海)理学院, 山东 威海 264209
光纤功能器件具有体积小、灵敏度高、抗电磁干扰、抗腐蚀、易于集成复用等独特优势,在微机械结构、生物医疗、海洋探测、航空航天等领域有着巨大的应用前景。飞秒激光具有超窄的脉冲宽度,在与材料相互作用时能够有效地避免热效应,具有较高的加工精度,因此被广泛应用于光纤功能器件制备。目前,利用飞秒激光直写技术、飞秒激光双光子聚合技术和飞秒激光水击穿技术等已制备出稳定可靠的三维高分辨率微纳光纤功能器件。主要介绍了光纤光栅、光纤干涉仪、光波导等光纤功能器件的飞秒激光加工技术发展状况,展望了飞秒激光加工技术的应用前景。
激光光学 飞秒激光 微纳加工 光纤传感 微流芯片 激光与光电子学进展
2020, 57(11): 111402
哈尔滨工业大学（威海）理学院光电科学系, 山东 威海 264209
提出了一种基于多模干涉效应(MMI)的单模-多模-间隙-单模（SMGS）光纤悬臂梁振动传感器。采用光束传播法（BPM）对这种结构的光传输性能进行数值模拟，并通过有限元分析方法对光纤悬臂梁进行了振动模态分析，从理论上优化设计了该类光纤振动传感结构。在实验上制备了长度为22 mm的悬臂梁结构，详细研究了多模区光纤的长度对声频振动响应的影响。实验结果表明，该SMGS振动传感器在130 Hz时响应效果最好，对应的声压灵敏度为4 mV/mPa，线性相关系数为0.9962，线性度和可重复性良好，并且实验结果和理论模拟结果相符合。这种光纤振动传感器具有制备工艺简单、成本较低和灵敏度高等特点，有望应用于对某些具有特殊振动频率点的远距离振动传感。
光纤光学 光纤振动传感器 多模干涉 自映像效应 悬臂梁 激光与光电子学进展
2016, 53(6): 060601
Author Affiliations
Abstract
1 Department of Optoelectronics Science, Harbin Institute of Technology at Weihai, Weihai 264209, China
2 School of Computer and Information, Hefei University of Technology, Hefei 230009, China
3 e-mail: slqu@hit.edu.cn
An ultrathin, planar, broadband metalens composed of metal rectangular split-ring resonators (MRSRRs) has been designed, which shows dual-polarity characteristics for different types of circularly polarized (CP) light incidence. The designed metalens can be considered as the focusing lens and the diverging lens under left-handed CP and right-handed CP light incidence, respectively. The phase discontinuity of the cross-polarized transmission light is produced by optical-axis rotation through modulating two arms’ lengths of the MRSRR. The MRSRR metalens possesses a wavelength-controllable focal length and a relatively larger chromatic aberration compared with the conventional lenses. And the focal length changes from 9 to 7 μm with incident wavelength from 740 to 950 nm. The dual-polarity flat metalens opens a door for new applications of phase discontinuity devices, and it will promote the fabricating capability of on-chip or fiber-embedded optical devices.
Lenses Metamaterials Phase modulation Photonics Research
2015, 3(3): 03000068
Author Affiliations
Abstract
1 School of Computer and Information, Hefei University of Technology, Hefei 230009, China
2 Department of Optoelectronics Science, Harbin Institute of Technology at Weihai, Weihai 264209, China
3 3Department of Physics, Harbin Institute of Technology, Harbin 150001, China
4 Department of Physics, Harbin Institute of Technology, Harbin 150001, China
In this paper, an ultrathin metalens has been proposed based on a holographic metasurface that consists of elongated apertures in 40 nm gold film, which exhibit intriguing properties such as on- and off-axis focusing and also can concentrate light into multiple, discrete spots for circularly polarized incident lights. First, the spatial transmission phase distributions of the designed metalens with arbitrary focusing can be obtained by computergenerated holography. Then, the discrete phase distributions can be continuously encoded by subwavelength nanoapertures with spatially varying orientations in gold film. The simulation results show that our designed metalens can work efficiently for different types of focusing. Finally, our metasurface shows superior broadband characteristics between 670 and 810 nm, and the corresponding focal lengths of the designed lenses also can be efficiently modulated with the incident lights at different wavelengths.
Metamaterials Metamaterials Optical devices Optical devices Phase modulation Phase modulation Optical resonators Optical resonators Photonics Research
2015, 3(5): 05000252
为了实现高灵敏度液体折射率传感器的高效制备, 采用飞秒激光直写技术, 在光纤末端刻蚀出矩形凹槽, 辅以光纤熔接方法, 制备出一种基于光纤内双开口法布里-珀罗(F-P)干涉腔的折射率传感器。该传感器的液体折射率传感灵敏度达到1107.76nm/RIU。讨论了温度对该传感器性能的影响, 温度串扰小于0.0025nm/℃;基于海水含盐浓度与折射率的线性关系, 探讨了该传感器在海水含盐浓度传感测量方面的应用, 灵敏度为0.171nm/(mg·mL-1)。结果表明, 基于光纤内双开口F-P干涉腔的折射率传感器具有干涉谱对比度高、线性响应良好、灵敏度高、不易受温度串扰、结构紧凑、制备简单高效等优点, 在生物、医疗、化学、环境等领域中有着广泛的应用前景。
光学器件 光纤传感器 飞秒激光 法布里-珀罗干涉 折射率 含盐浓度 optical devices optical fiber sensor femtosecond laser F-P interferometer refractive index salinity
1 空军工程大学 理学院, 陕西 西安 710051
2 哈尔滨工业大学(威海) 光电科学系, 山东 威海 264209
考虑激光棒的热透镜效应对有源平平腔、平凹腔进行了数值计算, 分析了谐振腔内激光光斑及腔体的稳定性。实验中以Er3+:Yb3+共掺磷酸盐玻璃为工作介质, 成功地实现了平凹腔在常温下连续输出TEM00模的1.54μm激光, 最大输出功率为21.5mW, 光光转换效率达到了0.7%。
固体激光器 传输矩阵 谐振腔 solid-state laser transmission matrix resonator
1 哈尔滨工业大学威海校区光电科学系, 山东 威海 264209
2 上海理工大学光电学院, 上海 200093
将微流控结构和光波导多模干涉(MMI)结构功能结合在一起, 利用导波的多模干涉效应, 对微通道中的液体变化进行实时监测。液体中成分或浓度的变化导致液体的折射率变化, 通过监测MMI的输出波导的功率, 得到液体折射率的变化, 从而得到液体成分浓度的变化。计算模拟显示, 对液体的折射率变化灵敏度可达到0.0001。对不同流量的要求, 提出了两种微流控结构和光波导MMI复合结构, 有望在微流控生化分析芯片中得到应用。
测量 微流控芯片 多模干涉光波导 液体 折射率
1 哈尔滨工业大学光电科学系, 山东 威海 264209
2 中国科学院上海光学精密机械研究所, 上海 201800
从理论上和实验上对飞秒激光脉冲通过散射表面后的时域特性进行了研究分析。用频率分辨光学开关法对通过散射表面前后的飞秒脉冲进行了测量和对比。理论分析和实验结果表明, 由于散射表面对飞秒脉冲的散射导致飞秒脉冲的展宽和形状的畸变。输入脉冲在时间相关函数的半峰全宽为64 fs; 透射脉冲在时间相关函数半峰全宽的平均值为117 fs。对透射脉冲场的统计特性进行了讨论, 透射脉冲场实部和虚部的概率函数分布遵从高斯函数分布; 强度的概率分布遵从指数分布规律; 给出了入射飞秒脉冲强度的自相关函数分布和飞秒时域散斑场强度的互相关函数分布的实验结果, 并且对二者的时间相关函数进行了讨论。
散射 时域特性 频率分辨光学开关法 飞秒脉冲 散射表面
Photon Craft Project, Shanghai Institute of Optics & Fine Mechanics, Chinese Academy of Sciences and Japan Science and Technology Corporation, Shanghai 201800. P.R. China
