Ultra-high extinction ratio polarization beam splitter with extreme skin-depth waveguide
Ultra-high extinction ratio polarization beam splitter with extreme skin-depth waveguide
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DOI：
10.1364/ol.420824
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发表时间：
2021-05-01
期刊：
影响因子：
3.6
通讯作者：
Kim, Sangsik
中科院分区：
文献类型：
--
作者：
Ahmed, Syed Z.;Ahmed, Ishtiaque;Kim, Sangsik
在这篇文章中，我们提出了一种高消光比和紧凑的片上偏振分束器（PBS），基于极端皮肤深度（eskid）波导。亚波长尺度光栅形成了有效的各向异性超材料包层，并引入了大的双折射。超材料包层的各向异性介电扰动通过异常耦合抑制了TE偏振消光，而大双折射有效地交叉耦合了TM模式，从而减小了耦合长度。我们在绝缘体上硅平台上演示了eskidp -PBS，并实现了超高消光比PBS (TE约为60 dB， TM约为48 dB)，耦合长度紧凑（约为14.5 μ m）。对于TE（TM）消光比bbb20 dB，插入损耗也可以忽略不计（80 (30)nm）。我们的超高消光比PBS对于实现高效极化分集电路至关重要，特别是在需要高度极化可分辨性的情况下，如光子量子信息处理。(C) 2021美国光学学会
In this Letter, we present a high extinction ratio and compact on-chip polarization beam splitter (PBS), based on an extreme skin-depth (eskid) waveguide. Subwavelength-scale gratings form an effectively anisotropic metamaterial cladding and introduce a large birefringence. The anisotropic dielectric perturbation of the metamaterial cladding suppresses the TE polarization extinction via exceptional coupling, while the large birefringence efficiently cross-couples the TM mode, thus reducing the coupling length. We demonstrated the eskid-PBS on a silicon-on-insulator platform and achieved an ultra-high extinction ratio PBS (approximate to 60 dB for TE and approximate to 48 dB for TM) with a compact coupling length (approximate to 14.5 mu m). The insertion loss is also negligible (80 (30) nm for the TE(TM) extinction ratio >20 dB. Our ultra-high extinction ratio PBS is crucial in implementing efficient polarization diversity circuits, especially where a high degree of polarization distinguishability is necessary, such as photonic quantum information processing. (C) 2021 Optical Society of America