On-chip polarization-independent nanophotonics mode splitter and converter enabled by subwavelength metamaterials

We propose the first polarization-independent mode splitter and converter by using subwavelength grating metamaterials, realizing the 3-dB splitting and mode-order conversion, simultaneously. Simulated insertion losses and crosstalks below 0.75 dB and −14.5dB over a 70-nm bandwidth are achieved for both TE and TM modes.