Figure 4 - uploaded by Xiaowei Guan
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(a) Polarization beam splitter (PBS) based on an asymmetrical directional coupler (ADC) with a silicon hybrid nanoplasmonic waveguide. (b) Simulated light propagation from this device. The coupling region (L c ) is as short as 2.2m even when the gap is as large as 200nm (for easy fabrication). There is little coupling for the TM-polarization mode because of the significant phase mismatching.
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