Guided-mode resonances in multimode planar periodic waveguides

• 来源期刊: 中国光学快报(英文版)
• 学科: 工学
• 关键词: 周期波导 平面波 导模共振 多模 严格耦合波分析 有效介质理论 本征方程 高反射率
• 年，卷（期）: 2010,（6）
• 所属期刊栏目: Diffraction and Gratings
• 页码范围: 557-559
• 页数: 3页
• 分类号: TN252 TN011
• 语种: 英文

摘要

Using the effective medium theory and the waveguide eigenvalue equation,we design a multimode planar periodic waveguide.When a plane wave illuminates the grating at the designed angle and wavelength, more than one leaky modes are excited coincidentally.Then the reflection efficiency around this designed angle and wavelength is investigated using a rigorous coupled wave analysis formulation and a gap of reflection peaks is found.Electric field distributions reveal that this high reflectivity gap is due to the coupling between these two coincidentally excited leaky modes.