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Early Posting
摘要
A micro-projection dynamic backlight for multi-view 3D display is proposed. The proposed backlight includes a light emitting diodes (LEDs) array, a lenticular lens array, and a scattering film. The LED array, the lenticular lens, and the scattering film construct a micro-projection structure. In this structure, the LEDs in the array are divided in several groups. The light from each LED groups can be projected to the scattering film by the lenticular lens and forms a series of bright stripes. The different LED groups have different horizontal positions, so these bright stripes corresponding to different LED groups also have different horizontal positions. Therefore, they can be used as a dynamic backlight. Because the distance between the LEDs array and the lenticular lens is much larger than the distance between the lenticular lens and the scattering films, the imaging progress will make the width of the bright stripes much smaller than that of the LEDs, and the pitch of the stripes is also decreased. According to the 3D display theory, the bright stripes with small width and pitch helps for increasing the number of views. So the proposed micro-projection dynamic backlight is very suitable for multi-view 3D display. An experimental prototype was developed, and the experimental results show that the micro-projection dynamic backlight can correctly complete the directional projection of the parallax images to form a 3D display.
Chinese Optics Letters
2021, 19(9):
Early Posting
摘要
In this study, an effective method is proposed for controlling titanium foil surface’s wettability. A series of microholes array is fabricated on the surface of titanium foil by femtosecond laser under different laser energy and pulse number. The changes of titanium surface’s morphology are characterized. By placing in darkroom with high-temperature treatment and immersing in alcohol under UV irradiation, respectively, the femtosecond laser treated surfaces display switchable wettability. It is demonstrated that the changing between Ti−OH and Ti−O prompts the transformation between superhydrophilic and superhydrophobic. Compared with the existing reports, the switchable wetting cycle is shorted to 1.5 h. The functional surfaces with switchable wettability have potential applications in oil-water separation and water mist collection.
Chinese Optics Letters
2021, 19(8):
Early Posting
摘要
High-<i>Q</i> lithium niobate (LN) optical micro-resonators are excellent platform for future applications in optical communications, nonlinear optics and quantum optics. To date, high <i>Q</i> factors are typically achieved in LN using either dielectric masks or femtosecond laser ablation, while the more standard and commonly available lift-off metallic masks are often believed to lead to rough sidewalls and lowered <i>Q</i> factors. Here we show that LN microring resonators with strong light confinement and intrinsic <i>Q</i> factors over 1 million can be fabricated using optimized lift-off metallic masks and dry etching processes, corresponding to a waveguide propagation loss of ~ 0.3 dB/cm. The entire process is fully compatible with wafer-scale production and could be transferred to other photonic materials.
Chinese Optics Letters
2021, 19(6):
Early Posting
摘要
A straightforward, cost-effective scheme for fabricating multi-focus droplet lens arrays is proposed. Mini lenses can be rapidly produced by dripping liquid-state polydimethylsiloxane droplet on the square glass substrate. The focal length of the lenses can be precisely controlled by adjusting the mass of the droplet. A group of prepared mini lenses can be flexibly assembled in a 3D printed mount. The lenses are tightly packed together, ensuring a high filling factor of the lens array. The lens array consisting of the mini lenses with a proper combination of focal length can capture images of interests at different depth.
Chinese Optics Letters
2021, 19(10):
Early Posting
摘要
Optical fibers have been widely applied to telecommunication, imaging, lasers, and sensing. Among the different types of fibers, photonic crystal fibers, also called micro-structured optical fibers, characterized by air holes arranged along the length of fibers have experienced tremendous advance due to the unique advantages. They are regarded as a desirable platform to excite surface plasmon resonance because of easy realization of phase matching conditions between the fundamental core mode and plasmonic mode, which plays a critical role in miniaturization and integration of surface plasmon resonance sensors. In this mini-review, the current status of photonic crystal fiber (PCF) sensors based on surface plasmon resonance (SPR) is summarized. The theory of SPR is discussed and simulation methods for PCF-SPR sensors are described. The important parameters including the refractive index detection range, resonance wavelength and spectral sensitivity responsible for the sensing properties of PCF-SPR sensors are reviewed. The fabrication and the comparison of performances are also illustrated and finally, the challenges and future perspectives are outlined.
Chinese Optics Letters
2021, 19(10):
综述
谢洪洋  余晓畅  高麒淦  苏扬  [ ... ]孙梓翔  虞益挺  
收起
摘要
胶体晶体是指由分散的微米级或亚微米级的胶体颗粒形成的具有有序结构的一类物质。自组装技术是胶体晶体制备工艺中一种常用的方法。概述了胶体晶体的基本概念及自组装的相关工艺,针对其在微纳光学领域的应用展开了详细的分析,介绍了不同的研究团队如何将自组装胶体晶体用于彩色打印、全息图、抗反射涂层、光学器件制造中,并对胶体晶体发挥的作用进行了归纳总结。胶体晶体独特的周期性结构赋予了它广阔的应用前景,通过不同的自组装技术提升胶体晶体的质量具有重要的意义。
激光与光电子学进展
2019, 56(23): 230001
Non-Hermitian Photonics in Complex Media: PT-symmetry and beyond
摘要
Photonics Research
2018, 6(5): PTS1
Nonlinear Integrated Photonics: Current Status and Future Trends
摘要
The field of nonlinear photonics is in full development. This special issue of Photonics Research takes you through the current issues of this fast-growing field of research, drawing on the current state of the art and seeking, through a selection of articles, to outline some trends for the future.
Photonics Research
2018, 6(5): NIP1
综述
杨欢  陈子伦  刘文广  陈金宝  
收起
摘要
光子灯笼是近几年兴起的一种光电子器件,可实现多模系统与多个单模系统之间的低损耗耦合,其一端为一根满足特定模式条件的多模波导,另一端则由一束相对较细的单模波导组构成。主要分析了光子灯笼的工作原理和几种特定的实现方式,并对这几种特定结构的特点和应用进行了概述。介绍了光子灯笼在天文光学、多路复用、模式控制、高能激光方面的应用和研究进展,对光子灯笼作为一种低损耗光波导器件在未来光学系统中的应用进行了展望。
激光与光电子学进展
2018, 55(12): 120002
李伦  郝永平  刁晓蕾  刘凤丽  
收起
摘要
提出一种新型可变焦非球面人工复眼结构,该结构将曲面复眼划分为三个扇形区域, 不同区域内的微透镜焦距不同, 使得人工复眼能够在一定范围内实现焦距调节.通过计算及仿真分析, 对各级微透镜结构进行非球面优化, 优化后各级微透镜的球差值为优化前的1/1000, 提高了曲面复眼的边缘成像质量.采用模压成型工艺制备得到子眼个数为61,基底直径为8.66 mm的变焦距非球面人工复眼样品, 并标定各子眼的相互位置, 建立多个子眼同时识别目标的定位数学模型.搭建了人工复眼成像性能测试及目标定位测试平台进行实验验证, 实验表明人工复眼相机能够捕获清晰的圆形和十字型光斑图像, 各扇形区域内采集的图像尺寸不同, 能够实现一定范围内变焦成像.通过多个微透镜捕捉目标,利用入射角度与像点重心之间的关系解出目标点坐标, 实验结果的定位误差值在10%以内.
光子学报
2018, 47(10): 1022001
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