A broadband and compact TE-pass/TM-stop polarizer is presented based on hybrid plasmonic grating (HPG) on an x-cut Lithium-Niobate-on-isolator (LNOI) platform. By comprehensively analyzing the effects of metal width on mode effective index, mode similarity, and mode conversion, we demonstrate the structure with a narrow metal layer. The simulation results indicate that the polarizer with a compact length of 9 μm achieves an extinction ratio over 20 dB within the wavelength range from 1470 nm to 1700 nm. The insertion loss is below 2.3 dB in C-band. Furthermore, the polarizer exhibits large fabrication tolerance to current fabrication technology.

中文翻译：

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LNOI平台上基于混合等离子光栅的宽带紧凑型TE型偏振器

提出了一种基于混合等离激元光栅（HPG）的宽带紧凑型TE-pass / TM-stop偏振器，该偏振器位于X切割隔离铌酸锂（LNOI）平台上。通过综合分析金属宽度对模态有效指数，模态相似性和模态转换的影响，我们证明了具有较窄金属层的结构。仿真结果表明，紧凑型长度为9μm的偏振器在1470 nm至1700 nm的波长范围内实现了20 dB以上的消光比。C波段的插入损耗低于2.3 dB。此外，偏振器对当前的制造技术表现出大的制造公差。