Abstract
We propose an ultracompact polarization beam splitter based on an asymmetric directional coupler, which comprises of a horizontally slotted waveguide and a hybrid plasmonic waveguide. The splitter is designed such that there is a large difference between the effective indices of the TE-polarized modes for the two waveguides, while the effective index difference between the TM-polarized modes are quite small in a wide wavelength range. Numerical results demonstrate that the proposed splitter with a short device length of 5 μm shows extinction ratios as low as −20 dB with bandwidths as great as 100 nm.
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Acknowledgments
This work is supported by the National Natural Science Foundation of China (NNSFC) (Grant No. 61275153), the Qing Lan Project of Jiangsu Province, and the Innovation Program of Graduated Student of Jiangsu Province (Grant No. CXZZ11_0547).
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Sun, B., Chen, MY., Zhang, YK. et al. An ultracompact hybrid plasmonic waveguide polarization beam splitter. Appl. Phys. B 113, 179–183 (2013). https://doi.org/10.1007/s00340-013-5453-y
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DOI: https://doi.org/10.1007/s00340-013-5453-y