中南民族大学电子信息工程学院智能无线通信湖北省重点实验室，湖北 武汉 430074
针对涡旋光束复用传输中拓扑荷测量的问题，根据广义惠更斯菲涅耳积分，利用傅里叶光学分析方法和光束分步传播法，建立光束传播模型，对拉盖尔高斯光束经复用在真空中传输进行数值仿真。通过分析光束真空传输后的相位分布，发现两束光复用后的相位分布特征与参与复用的各光束拓扑荷值之间有可辨别的关联，具体规律是相位的中心扇叶片数和叶片旋转方向与复用光束中拓扑荷绝对值较小的光束相同，而相位的外边缘相位叉点的个数和旋转方向分别与复用各光束的拓扑荷数值差的绝对值﹑拓扑荷数值较大者相同。所得结果为涡旋光束拓扑荷数的测量提供新方法。
物理光学 轨道角动量复用 拉盖尔高斯光束 拓扑荷 激光与光电子学进展
2016, 53(9): 092603
中南民族大学电子信息工程学院智能无线通信湖北省重点实验室, 湖北 武汉 430074
提出在非晶硅薄膜太阳电池吸收层的上下表面采用亚元对称光栅来提高薄膜电池吸收率。采用严格耦合波分析法研究发现，对于厚度为400 nm 的非晶硅薄膜，在600~750 nm 波长范围内，这种新型光栅能有效地减少从上表面反射的入射光和从下表面透射的泄漏光，并增强吸收层的吸收率。仅在上表面采用亚元对称光栅，优化后的吸收率可以增强71%；仅在下表面采用光栅，吸收率增强24%；在上下表面同时采用光栅，太阳电池的吸收率可以增强81%。本研究为设计易于制作的具有高吸收率的薄膜太阳电池提供了新的思路。
光电子学 光栅 硅薄膜太阳电池 吸收增强 严格耦合波分析
Author Affiliations
Abstract
1 Hubei Key Laboratory of Intelligent Wireless Communications, College of Electronics and Information Engineering, South-central University for Nationalities, Wuhan, Hubei 430074, China
2 Wuhan National Laboratory for Optoelectronics (WNLO), School of Physics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
Wepresent a novel method for engineering ultra-flattened-dispersion photonic crystal fibers with uniform air holes by rotations of inner air-hole rings around the fiber core. By choosing suitable rotation angles of each inner ring, theoretical results show that normal, anomalous, and nearly zero ultra-flattened-dispersion fibers in wide spectra ranges of interest can be obtained alternatively. Moreover, in our dispersion sensitive analysis, these types of fibers are robust to variations from optimal design parameters. The method is suitable for the accurate adjustment of fiber dispersion within a small range, which would be valuable for the fabrication of ultra-flattened-dispersion fibers and also have potential applications in wide-band high-speed optical communication systems.
Photonic crystal fibers Fiber properties Fiber design and fabrication Photonics Research
2014, 2(2): 02000059
Author Affiliations
Abstract
In this study, we propose that by diminishing only the pitch of the innermost air-holes-ring of a HF1 photonic crystal fiber, both an effective mode area up to 100 μm2 at 1.55 μm wavelength and nearly zero dispersion of 0.2 ± 1 ps/(km·nm) within a spectrum range of 1.23–1.65 μm can be achieved simultaneously. Because only one parameter is needed to be tuned in the proposed design scheme, the fiber would be easier to be fabricated compared to other fibers using either multiple changing parameters or additional kinds of materials and would have potential applications in optical communications.
060.5295 Photonic crystal fibers 060.2270 Fiber characterization 060.2430 Fibers, single-mode 060.2280 Fiber design and fabrication Chinese Optics Letters
2014, 12(s1): S10607
