Magneto-optical Guided-Wave Devices for Microwave and Optical Signal Processing

在NSF之前的支持下，我们已经开始了微波静磁波诱导下磁性石榴石薄膜中光导模式转换的仔细研究。这种相互作用可能导致新的微波和光信号处理设备，包括微波频谱分析仪和光移频器。我们建议通过研究与提高相互作用产生的转换效率有关的两个问题来继续这项工作。首先，利用高微波功率实现高效模式转换时所产生的微波非线性现象将不仅通过对微波频谱的研究，而是通过对转换模式的光谱和衍射光束的角分布的考察。其次，我们提出研究在石榴石异质结构中传播的静磁波引起的光模式转换。先前的理论研究表明，在具有针对微波和光学特性进行优化的分层的异质结构中，比在单一磁性层中更容易获得有效的模式转换。

With previous NSF support, we have begun a careful study of mode conversion between optical guided modes in magnetic garnet thin films induced by microwave magnetostatic waves. This interaction may lead to new microwave and optical signal processing devices including microwave spectrum analyzers and optical frequency shifters. We propose to continue this work by studying two issues related to increasing the conversion efficiency resulting from the interaction. First, the microwave nonlinear phenomena which occur when high microwave power is used to achieve efficient mode conversion will be studied by not only examining the microwave spectrum, but by examining the optical spectrum of the converted mode and the angular distribution of the diffracted beam. Second, we propose to study optical mode conversion induced by magnetostatic waves propagating in a separate layer of a garnet heterostructre. Previous theoretical studies have suggested that efficient mode conversion may be easier to obtain in a heterostructre, with separate layers optimized for microwave and optical properties, than in a single magnetic layer.