[1] Shen B, Wang P, Polson R et al. An integrated-nanophotonics polarization beamsplitter with 2.4 × 2.4 μm 2 footprint[J]. Nature Photonics, 9, 378-382(2015).
[19] Kawano K. 20-[M]. Kitoh T. Introduction to optical waveguide analysis: Solving Maxwell's equations, the Schredinger equation. New York: Wiley, 23, 50-58(2001).