A numerical study demonstrates that an ultrahigh extinction ratio of $ \ge 3 \times {10^9} $ is possible in a metasurface polarizer. The metasurface has stacked complementary structures with an air-hole array. From Babinet’s principle, this kind of metasurface is known to have a high extinction ratio exceeding $ {10^4} $. In this paper, numerical calculations reveal that Babinet’s principle incorporating destructive interference between localized and propagating surface plasmon polariton resonances is key in the enormous enhancements in the extinction ratio. Moreover, this study shows that an asymmetry in the complementary structures plays a crucial role in the fine adjustments of the interference. As a result, an extremely low transmittance is realized, leading to an ultrahigh extinction ratio of $ \ge 3 \times {10^9} $ in the O-band. An analytical study confirms that the low transmittance associated with ultrahigh extinction ratios originates from the destructive interference. Such ultrahigh performances are wavelength-tunable by a simple scaling of the metasurface and a fine adjustment of the interference. In the C-band, the ultrahigh extinction ratio exceeds $ 200 \times {10^9} $. This study reveals the numerical and theoretical design criteria for ultrahigh extinction ratios in metasurface polarizers.

中文翻译：

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通过表面等离子体激元干涉提高超表面偏振器的消光比

数值研究表明，超表面消光比为$ \ ge 3 \ times {10 ^ 9} $。超颖表面具有带有气孔阵列的堆叠互补结构。根据巴比涅原理，已知这种超表面的消光比超过$ {10 ^ 4} $。在本文中，数值计算表明，Babinet原理结合了局部和传播表面等离振子极化共振之间的破坏性干扰，是消光比极大提高的关键。此外，这项研究表明，互补结构的不对称性在干扰的精细调节中起着至关重要的作用。结果，实现了极低的透射率，导致超高消光比为\ \ ge 3 \ times {10 ^ 9} $在O波段 分析研究证实，与超高消光比相关的低透射率源于相消干涉。通过超颖表面的简单缩放和干涉的精细调节，这种超高性能是波长可调的。在C波段中，超高消光比超过$ 200 \ times {10 ^ 9} $。这项研究揭示了超表面消光比中超高消光比的数值和理论设计标准。