A low-loss hybrid plasmonic transverse magnetic (TM)-pass polarizer has been demonstrated utilizing polarization-dependent mode conversion. Taking advantage of the silicon hybrid plasmonic slot waveguide (HPSW), the unwanted transverse electric (TE) fundamental mode can be efficiently converted first to a TM higher-order mode and then suppressed by a power combiner, while the retained TM fundamental mode can pass through with negligible influence. Since the HPSW feature both strong structural asymmetry and a small interaction area in the cross-section between the metal and optical field, the optimized insertion loss of the device is as low as 0.4 dB. At the wavelength of 1550 nm, the extinction ratio is 28.3 dB with a moderate footprint of 2.38 μm×10 μm. For the entire C band, the average reflection of the TE mode is suppressed below −14 dB, and the extinction ratio is over 18.6 dB. This work provides another more efficient and effective approach for better on-chip polarizers.

中文翻译：

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使用偏振相关模式转换的低损耗混合等离子体 TM-pass 偏振器

低损耗混合等离子体横磁 (TM) 通偏振器已被证明使用偏振相关模式转换。利用硅混合等离子体狭缝波导（HPSW），不需要的横向电（TE）基模可以首先有效地转换为TM高阶模，然后被功率合成器抑制，而保留的TM基模可以通过通过微不足道的影响。由于 HPSW 具有很强的结构不对称性和金属和光场之间横截面的小相互作用区域，因此该器件的优化插入损耗低至 0.4 dB。在 1550 nm 波长处，消光比为 28.3 dB，中等尺寸为 2.38 μm×10 μm。对于整个 C 波段，TE 模式的平均反射被抑制在-14 dB 以下，消光比大于18.6dB。这项工作为更好的片上偏振器提供了另一种更有效的方法。