Optimization of Radiation Modes in Asymmetric Planar Slab Optical Waveguides

In this paper, we try to optimize the substrate-radiation/substrate-cladding (cover) radiation modes in terms of their performance parameters. It is well known that the guided modes can only be normalized. However the radiation modes can also be normalized by using the Delta/Dirac function. We try to optimize the waveguide design parameters for the known cases to achieve performance as good as guided modes. The formal electromagnetic theory is applied to study the radiation modes. The normalization condition on radiation mode has been taken care in to analysis. The results are found satisfactory. It has been concluded that we can modify the performance of radiation modes according to our requirements. The performance is compared with guided mode. The paper discusses guidelines to optimize the radiation modes for various constraints.