Fig. 1. Schematic structure of controllable polarization beam splitter. (a) Top view; cross-sectional view when the liquid crystal director is (b) in horizontal states and (c) in vertical states

Fig. 2. Optical field distributions of signal in process of propagating when crystal axis of liquid crystal is along horizontal direction. (a) TE wave; (b) TM wave

Fig. 3. Optical field distributions of signal in process of propagating when crystal axis of liquid crystal is along vertical direction. (a) TE wave; (b) TM wave

Fig. 4. Normalized optical power output varying with the operation wavelength. (a) TE wave; (b) TM wave

Fig. 5. Normalized optical power output varying with the rib thickness. (a) TE wave; (b) TM wave