Author Affiliations
Abstract
1 College of Electronic and Optical Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
2 School of Material Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
3 State Key Laboratory of Transient Optics and Photonics, Xi′an Institute of Optics and Precision Mechanics, Chi-nese Academy of Sciences, Xi′an 710119, China
In this work, we report the fabrication of an optical waveguide by single-energy H+ ion implantation in the Er3+-doped phosphate glass. The ion implantation conditions are with energy of 0.4 MeV and a fluence of 8.0×1016 ions/cm2. The dark mode spectrum of the waveguide structure was measured by the prism coupling experiment. The refractive index change along with the penetration depth was fitted by using the reflectivity calculation method (RCM). Finally, the calculated near-field light intensity distribution shows superior waveguide properties, which demonstrates its promis-ing potentials for compact optical integrated devices.
光电子快报（英文版）
2019, 15(2): 104
Author Affiliations
Abstract
1 National Synchrotron Radiation Laboratory, Collaborative Innovation Center of Chemistry for Energy Materials, University of Science and Technology of China, Hefei 230029, China
2 College of Science, Sichuan Agricultural University, Ya’an 625014, China
3 CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230029, China
Polymethyl methacrylate (PMMA) plate luminescent solar concentrators with a bottom-mounted (BM-LSCs) photovoltaic (PV) cell are fabricated by using a mixture of Lumogen Red 305 and Yellow 083 fluorescent dyes and a commercial monocrystalline silicon cell. The fabricated LSC with dye concentrations of 40 ppm has the highest power gain of 1.50, which is the highest value reported for the dye-doped PMMA plate LSCs. The power gain of the LSC comes from three parts: the waveguide light, the transmitted light, and the reflected light from a white reflector, and their contributions are analyzed quantitatively. The results suggest that the BM-LSCs have great potential for future low-cost PV devices in building integrated PV applications.
350.6050 Solar energy 040.5350 Photovoltaic 220.1770 Concentrators Chinese Optics Letters
2017, 15(6): 063501
1 海军工程大学, 湖北 武汉 430033
2 武汉理工大学, 湖北 武汉 430070
对比度增强在图像处理系统中常用来提高降质图像质量或增强图像细节。从优化问题的角度来处理图像增强,提出了用混合智能算法,结合细菌觅食优化算法和粒子群优化算法的优点,对图像增强算子的参数进行优化,使图像质量达到最佳。使用的增强算子取决于源图像的局部灰度信息和全局统计信息,采用的适应度函数是基于图像的边缘信息和熵信息。仿真和实验结果表明该方法不仅能实现图像对比度增强还能有效提高目标图像的细节,并有效抑制噪声。
图像增强 智能优化 细菌觅食算法 粒子群优化 image enhancement intelligent optimization bacterial foraging algorithm particle swarm optimization
1 海军工程大学, 湖北 武汉 430033
2 武汉理工大学, 湖北 武汉 430070
设计一种以DSP为核心, FPGA协助数据采集、传输的图像处理平台。DSP运行复杂图像处理算法, 通过EMIF接口和FPGA进行高速数据传输。FPGA对EMIF接口进行扩展, 将图像传感器、SDRAM存储器、USB接口等统一到EMIF接口, 提高系统的集成度和灵活性, 实现DSP与FPGA、外设之间数据准确、高效、可靠的传输。实验表明, 该系统满足实时性设计需求, 易于扩展和升级, 具备较强的通用性。
时序 DMA操作 EMIF external memory interface (EMIF) field-programmable gate array (FPGA) FPGA timing sequence direct memory access (DMA) operation
