A novel polarisation beam splitter (PBS) with a high extinction ratio in a broad band has been proposed and realised by cascading a bent directional coupler and a low‐loss transverse‐magnetic (TM)‐pass polariser based on a subwavelength grating. The realised PBS has a footprint as small as 3 × 22.5 μm, a high extinction ratio (>20 dB) and a low excess loss (∼1 dB) are obtained over a broad band of ∼60 nm for both transverse‐electric and TM polarisations.
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Chen et al. (2016) studied this question.
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