1 南京信息工程大学物理与光电工程学院, 江苏 南京 210044
2 山东师范大学物理与电子科学学院, 山东 济南 250358
开发高性能的电光调制器对于构建片上光子回路非常重要。鉴于纳米线结构具备独特的电场横向束缚特点,设计一种基于纳米线的混合表面等离激元波导电光调制器,该调制器由偏置双硅纳米线、双石墨烯层以及置于双石墨烯层之间的银纳米线构成。利用二维时域有限差分算法计算分析结构参数对器件调制性能的影响。模拟结果表明,所设计的调制器在1550 nm的工作波长下可以实现较为出色的调制性能,其3 dB调制带宽高达250 GHz, 调制深度和功耗分别高于0.15 dB/μm和低于11.5 fJ/bit,该调制器可为新一代高性能集成电光调制器的开发提供设计思路。
光学器件 纳米线 混合表面等离激元 石墨烯 调制器 光学学报
2021, 41(19): 1923001
Author Affiliations
Abstract
1 Institute of Photonics, Faculty of Science, Ningbo University, Ningbo 315211, China
2 Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
3 Department of Electrical and Computer Engineering, Dalhousie University, Halifax, NS B3J 2X4, Canada
The optical properties of a three-arm plasmonic nanoantenna with and without broken symmetry were analyzed in detail. For the symmetrical structure, the local electric field can be significantly enhanced and well confined within the feed gap, whilst the extinction spectrum illustrates polarization independence. With broken symmetry, multi-wavelength resonances are observed due to the single dipole resonance and dipole–dipole coupling effect, and wide tunability is also available through minor structural adjustment. Especially when illuminated by a circularly polarized light beam, the extinction and the electric field distribution can be effectively modulated by just varying the incident wavelength.
260.5430 Polarization 290.2200 Extinction Chinese Optics Letters
2018, 16(5): 052501
1 宁波大学理学院物理系，浙江宁波 315211
2 意大利国家研究院自动控制研究所，意大利那波利 , 80078
根据傅里叶光学原理，研究了二维 Thue-Morse准周期光子晶体结构的格点形状对其远场衍射特性的影响。通过对二维 Thue-Morse准周期光子晶体远场衍射图案的分析表明，格点形状对低阶结构的衍射光场有明显影响，但不改变高阶结构的衍射光场分布，仅衍射精细结构的光强度有细微差别。为了证实数值模拟的结果，采用电子束刻蚀技术在聚甲基丙烯酸甲酯（ PMMA）基底上制作了纳米量级的圆形空气孔和方形空气孔的二维 Thue-Morse型准周期光子晶体，对其远场衍射的光学特性进行了实验观测，实验结果与理论模拟一致。
准周期光子晶体 Thue-Morse序列 远场衍射 photonic quasicrystals Thue-Morse sequence far field diffraction
