Abstract
An ultracompact polarization beam splitter (PBS) is proposed based on an asymmetrical directional coupler consisting of a silicon hybrid plasmonic waveguide (HPW) and a silicon nanowire. The widths of the two coupling waveguides are chosen so that the phase-matching condition is satisfied for TE polarization only while the phase mismatch is significant for TM polarization. A sharply bent silicon HPW is connected at the thru port to play the role of polarizer by utilizing its polarization-dependent loss. With the present principle, the designed PBS has a footprint as small as only , which is the shortest PBS reported until now, even when large waveguide dimensions (e.g., the waveguide widths and the gap width ) are chosen to simplify the fabrication process. The numerical simulations show that the designed PBS has a very broad band () with an extinction ratio and a large fabrication tolerance to allow a waveguide width variation of .
© 2013 Optical Society of America
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