A novel broadband and wide-angle polarization beam-splitter (PBS) based on a dumbbell grating with a cylindrical profile is proposed and numerically analyzed in this study. The designed structure consists of alternating Si and ZnS cylindrical resonators stacked on a SiO2 substrate. By employing the Eigenvalue Problem of Modal Transmission-Line Theory (EP-MTLT), the reflection and transmission characteristics for TE and TM polarizations are rigorously investigated. The cylindrical dumbbell profile enhances polarizationdependent guided-mode resonance (GMR), providing strong reflection for TE-polarized light and efficient transmission for TM-polarized light across a broad wavelength range. Simulation results demonstrate that the proposed PBS achieves high polarization extinction ratio, broadband operation, and wide angular tolerance up to ±20°, while maintaining compact geometry and fabrication robustness. Therefore, the proposed structure offers a promising approach for realizing miniaturized, broadband, and wide-angle polarization beamsplitters suitable for photonic integration and optical communication systems.
목차
Abstract 1. Introduction 2. Simulation Method and Theoretical Model 3. Reflectivity Behavior of Broadband and Wide-Angle PBS 4. Conclusion Acknowledgement References