为了获得导电岛微电极系统中纳米线的介电组装特性, 基于平面微电极对和导电岛微电极系统, 进行了两种系统中纳米线操控的对比实验。分别建立了平面微电极对和导电岛微电极系统的纳米线介电组装模型, 探究了两种模型下的纳米线从初始位置到最终桥接上微间隙过程中的运动轨迹; 分析了导电岛微电极系统中纳米线所受的介电泳力、交流电热流以及两者合作用的电动力学行为。导电岛微电极系统对纳米线有着较强的介电俘获作用, 导电岛的加入能够让纳米线更好地俘获到微间隙; 同时纳米线的介电组装会受到频率的影响, 当频率达到翻转频率, 在微间隙上方产生的微流体漩涡能够把远场区域纳米线输送到组装区, 使得纳米线受到正介电泳力的作用而被组装至微间隙。
1 长春理工大学机电工程学院，吉林 长春 130022
2 陆军装甲兵学院士官学校基础部，吉林 长春 130117
受自然界素饰蛱蝶翅膀鳞片表面结构的启发，本研究团队建立仿生结构模型，利用激光烧蚀技术在粗化铝合金表面构建了一种具有超疏水、低黏附、自清洁性能的仿生网格状多级结构。采用扫描电子显微镜(SEM)、X射线光电子能谱仪(XPS)、光学接触角测量仪和高速成像等设备对材料表面进行了表征分析，结果表明：喷砂粗化结合激光烧蚀可以形成类蛱蝶鳞片网格状多级结构，该结构具有复杂的形态和复合尺度特征，其表面具有超疏水性能，静态接触角可达到162.6°，滚动角小于5°；液滴弹跳试验和自清洁性能试验结果表明，该仿生结构表面具有良好的低黏附力和自清洁性能，在脱附、减阻、自清洁等领域具有一定的应用潜力。
激光技术 微观结构制造 超疏水表面 自清洁 低黏附 仿生结构 中国激光
2022, 49(16): 1602009
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
