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An ultracompact hybrid plasmonic waveguide polarization beam splitter |
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| Authors: | Bing Sun Ming-Yang Chen Yong-Kang Zhang Jun Zhou |
| Institution: | 1. Department of Optical Engineering, School of Mechanical Engineering, Jiangsu University, Zhenjiang, 212013, Jiangsu Province, China 2. School of Mechanical Engineering, Southeast University, Nanjing, 211189, Jiangsu Province, China 3. Faculty of Science, Ningbo University, Ningbo, 315211, Zhejiang Province, China |
| 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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