Ultra-compact, efficient and high-polarization-extinction-ratio polarization beam splitters based on photonic anisotropic metamaterials

Jingjing Zhang, Xiaodong Shi, Zhaojian Zhang, Kai Guo, Junbo Yang

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Abstract

Anisotropic metameterials (AM) provide a new avenue for next-generation silicon platform to design ultra-compact, densely integrated optical components, thus functional devices based on AM are drawing increasing attention recently. Here, we propose a novel efficient polarization beam splitter (PBS) with high polarization extinction ratio based on AM. An ultra-compact coupling region of 2.5 × 14 µm2 is achieved by tailoring the AM structures, which can efficiently suppress the TE mode coupling, and enhance the TM mode coupling in the directional couplers, simultaneously. The insertion loss is simulated to be as low as <0.2 dB within a bandwidth of 70 nm for both modes, and the polarization extinction ratio is as high as 46 dB and 33 dB for TE and TM modes, respectively. We also experimentally demonstrate the proposed PBS, with low insertion loss of 1 dB , high extinction ratio of >20 dB and wide operational bandwidth of >80 nm.
Original languageEnglish
JournalOptics Express
Volume30
Issue number1
Pages (from-to)538-549
ISSN1094-4087
DOIs
Publication statusPublished - 2022

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