| The polarizers are important elements of integrated optical circuits. In this research work, two types of metal-clad TM-pass polarizers, transmission mode polarizer and reflection mode polarizer, are studied. In the first type, the TM polarized waves are transmitted with low-loss, while TE polarized wave are transmitted with very high loss. The second type of polarizer has corrugations in its structure. It functions by reflecting TM waves with low-loss, while the reflected TE polarized waves are highly attenuated. The reflection and transmission spectra of the reflection mode polarizer are calculated for different high-index buffer layer thicknesses, different number of grating periods, different groove depths and different length of metal-clad section. The Method of Lines (MOL) with the Cascading and Doubling Algorithm is applied to model the multi-layer waveguide structure with periodic corrugations. Higher-order approximations of the second derivative (∂2/∂ x2) operator with appropriate of interface conditions are used. The Perfectly Matched Layer (PML) absorber is used to absorb the radiated fields due to the presence of longitudinal discontinuities. |
