1 School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
2 Department of Electrical and Computer Engineering (ECE), National University of Singapore, Singapore 117583, Singapore
3 Wuhan National Laboratory of Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
Frontiers of Optoelectronics
2021, 14(2): 148–153
电子科技大学 电子薄膜与集成器件国家重点实验室, 四川 成都 610054
研究了石墨烯/氮化硼二维异质结增强的硅基太赫兹波光调制器。利用太赫兹波时域谱系统和实验室自主搭建的太赫兹波动态测试系统分别测试了808 nm激光对太赫兹波的静态和动态调制。当照射在太赫兹波调制器上的激光功率从0增加至500 mW时, 平均太赫兹波透过率从58%下降到13%, 静态调制深度最高达到76%(500 mW)。动态测试获得的最大调制速度为15 kHz (100 mW)。实验结果表明, 与单层石墨烯增强的硅基调制器相比, 石墨烯/氮化硼异质结可以更大地提高硅对于太赫兹波的调制深度, 并提升调制速度。
太赫兹调制器 氮化硼 石墨烯 光控 硅 terahertz modulator boron nitride graphene optically-control silicon
电子科技大学 光电信息学院, 四川 成都 610054
通过模拟仿真, 研究了基于绝缘衬底上的硅(Silicon-On-Insulator, SOI)的微环生物传感器的传感性能, 得出其体传感灵敏度为38.71 nm/RIU, 探测极限为1.8×10-3 RIU, Q值为2.22×104。基于该结构, 分析了噪声对传感器性能的影响, 包括光源噪声和温度噪声。为了降低噪声影响, 设计了具有参考和探测通道的双微环差分传感器, 通过差分运算扣除噪声引起的谐振波长漂移, 从而可以有效降低噪声对传感器探测结果的影响。通过数值模拟和计算, 其被探测物的折射率变化的相对误差减小了15.85%, 表明微环差分传感器可以有效降低噪声的影响, 对提高微环生物传感器的性能将有极大的促进作用。
集成光学 光子传感 微环生物传感器 回音壁模式 差分降噪 integrated optics optical sensing micro-ring biosensor whispering gallery mode differential noise reduction 红外与激光工程
2018, 47(2): 0222002
Author Affiliations
Abstract
School of Optoelectronic Information, University of Electronic Science and Technology of China, Chengdu 610054, China
Optical biosensors with a high sensitivity and a low detection limit play a highly significant role in extensive scenarios related to our daily life. Combined with a specific numerical simulation based on the transfer matrix and resonance condition, the idea of novel single-waveguide-based microresonators with a double-spiral-racetrack (DSR) shape is proposed and their geometry optimizations and sensing characteristics are also investigated based on the Vernier effect. The devices show good sensing performances, such as a high quality factor of 1.23×105, a wide wavelength range of over 120 nm, a high extinction ratio (ER) over 62.1 dB, a high sensitivity of 698.5 nm/RIU, and a low detection limit of 1.8×10 5. Furthermore, single-waveguide-based resonators can also be built by cascading two DSR structures in series, called twin-DSRs, and the results show that the sensing properties are enhanced in terms of quasi free spectral range (FSR) and ER due to the double Vernier effect. Excellent features indicate that our novel single-waveguide-based resonators have the potential for future compact and highly integrated biosensors.
280.1415 Biological sensing and sensors 230.5750 Resonators 230.3990 Micro-optical devices 230.3120 Integrated optics devices Chinese Optics Letters
2017, 15(1): 010006
Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology, Wuhan 430074, China
Close packed ZnO nanoparticles on carbon cloth were synthesized by repeating a facile hydrothermal route in this study. After characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), the obtained ZnO cloth was further studied for the applications in lithium (Li)-ion batteries (LIBs) and dye-sensitized solar cells (DSSCs). When ZnO cloth annealed at 400°C for 2 h were used as anodes of LIBs, it exhibited high capacity of 600 mAh/g and outstanding cycling capability without significant fading after 130 cycles. Moreover, it was also found that our electrodes displayed good stabilities under various humidity and temperature. Furthermore, the obtained composites were calcined at higher temperature (800°C) to remove carbon and white pure ZnO cloth was formed. We transferred the as-formed ZnO cloth to fluorine-doped tin oxide (FTO) substrate to make DSSCs, exhibiting an improved efficiency of around 0.38% assisted by TiCl4 treatment.
lithium-ion batteries (LIBs) lithium-ion batteries (LIBs) dye-sensitized solar cells (DSSCs) dye-sensitized solar cells (DSSCs) ZnO nanoparticles ZnO nanoparticles carbon cloth carbon cloth facile hydrothermal route facile hydrothermal route Frontiers of Optoelectronics
2015, 8(2): 220
为了设计新型基于椭圆形反射镜面的扇形半导体微环激光器，采用光线追迹和有限时域差分的方法进行了理论分析和设计仿真。与普通的三角形环形腔相比，由于引入了椭圆形反射镜面，使得这种新型的微腔的镜面反射损耗极低，仅为1%，功率传输率为93%，Q值极高，在1576.36nm谐振波长处,Q值达到了23318.6。结果表明，这种新型的微环激光器有利于实现方向双稳态，并可进一步用于全光信号处理领域。
激光器 微环激光器 椭圆形谐振腔 三角形环形腔 有限时域差分 光线追迹 lasers micro-ring laser elliptical cavity triangular ring cavity finite difference time domain ray-tracing
提出了一种由一个分布式反馈激光器为主激光器和一个半导体环形激光器为从激光器组成的主从式激光混沌系统方案，主激光器产生的光单向注入到从激光器中，通过调整注入系数、主从激光器的失谐频率和从激光器的偏置电流，使从激光器工作在混沌状态，输出混沌信号。从基于光注入条件下的环形激光器的速率方程组入手，数值模拟了主从激光器的失谐频率、注入系数和从激光器的偏置电流3个工作参量对从激光器输出动态的影响。研究表明：外光注入条件下，半导体环形激光器可以产生混沌信号。通过分析得出: 当失谐频率为3.9 GHz、注入系数为0.07、偏置电流为81 mA时，环形激光器可以产生功率谱平坦、带宽较宽的高质量混沌信号。
光通信 混沌信号 光注入 半导体环形激光器 分叉图 optical communications chaotic signals optical injection semiconductor ring laser bifurcation diagram
