论文标题
非热模多模的干扰
Non-Hermitian Multimode Interference
论文作者
论文摘要
多模式干扰（MMI）和自我成像是衍射波光学器件的重要现象，在光学信号处理，光束塑形和光学传感中的主要应用。这种现象通常是由于正常模式在无损介电引导结构中的干扰而产生的，但是空间抗均匀的光学增益和损失的影响，即断裂模式的正交性和对称性。在这里，我们考虑在非炎性光学系统中的MMI，即具有光学增益和损失的分级索引或耦合的光学波导结构，并揭示了独特的特征，例如缺乏镜像图像和自我形象对扰动的强烈敏感性，从而使MMI在光学感官中具有不利性波动中的MMI。
Multi-mode interference (MMI) and self-imaging are important phenomena of diffractive wave optics with major applications in optical signal processing, beam shaping and optical sensing. Such phenomena generally arise from interference of normal modes in lossless dielectric guiding structures, however the impact of spatially-inhomogeneous optical gain and loss, which break mode orthogonality and symmetries, has been overlooked. Here we consider MMI in non-Hermitian optical systems, either graded index or coupled optical waveguide structures with optical gain and loss, and reveal distinctive features, such as the absence of mirror images and strong-sensitivity of self-imaging to perturbations, making MMI in non-Hermitian waveguides of interest in optical sensing.
