Polarizers have been widely used in various optical systems to reduce polarization cross talk. The polarizers based on the silicon nanowire waveguide can provide chip-scale device size and a high polarization extinction ratio. However, the working bandwidth for the on-chip silicon polarizers is always limited ( 20 dB) over a >415 nm bandwidth from 1.26 to 1.675 μm, which is at least fourfold better than what has been demonstrated in all previous works. To the best of our knowledge, such a device is the first all-silicon polarizer that covers O-, E-, S-, C-, L-, and U-bands.

中文翻译：

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具有 415 nm 带宽的各向异性超材料辅助全硅偏振器

偏振器已广泛用于各种光学系统中以减少偏振串扰。基于硅纳米线波导的偏振器可以提供芯片级的器件尺寸和高偏振消光比。然而，片上硅偏振器的工作带宽总是限制在（20 dB），超过 415 nm 的带宽，从 1.26 到 1.675 μm，这至少比之前所有工作中证明的要好四倍。据我们所知，这样的器件是第一个覆盖 O-、E-、S-、C-、L- 和 U-波段的全硅偏振器。