Controlling evanescent waves using silicon photonic all-dielectric metamaterials for dense integration.
Controlling evanescent waves using silicon photonic all-dielectric metamaterials for dense integration.
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DOI：
10.1038/s41467-018-04276-8
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发表时间：
2018-05-14
影响因子：
16.6
通讯作者：
Jacob Z
中科院分区：
文献类型：
--
作者：
Jahani S;Kim S;Atkinson J;Wirth JC;Kalhor F;Noman AA;Newman WD;Shekhar P;Han K;Van V;DeCorby RG;Chrostowski L;Qi M;Jacob Z
在cmos代工平台上制造的超紧凑、密集集成的光学元件是光学信息处理和电子-光子协整的理想选择。然而，在硅光子器件中普遍存在的由纳米尺度约束产生的大空间范围的倏逝波会导致显著的串扰和散射损失。在这里，我们证明了各向异性全介质超材料在全内反射中开辟了一个新的自由度，以缩短倏逝波的衰减长度。我们通过实验证明，在密集集成的超紧凑光子电路块中，串扰减少了30倍以上，弯曲损耗减少了3倍以上。我们的原型全介质超材料波导的传输损耗约为3.7±1.0 dB/cm，与硅条波导相当。我们的方法标志着光子晶体或缝隙波导中基于干涉的限制的不同，它们利用纳米尺度的场增强。它在不显著增加传播损耗的情况下抑制倏逝波的能力将为基于全介电超材料的密集集成铺平道路。光学元件的小型化可以让位于密集的光子集成电路。在这里，作者展示了使用全介质超材料控制倏逝波，并表明它们可以减少串扰和弯曲损耗，这限制了光子电路的集成密度。
Ultra-compact, densely integrated optical components manufactured on a CMOS-foundry platform are highly desirable for optical information processing and electronic-photonic co-integration. However, the large spatial extent of evanescent waves arising from nanoscale confinement, ubiquitous in silicon photonic devices, causes significant cross-talk and scattering loss. Here, we demonstrate that anisotropic all-dielectric metamaterials open a new degree of freedom in total internal reflection to shorten the decay length of evanescent waves. We experimentally show the reduction of cross-talk by greater than 30 times and the bending loss by greater than 3 times in densely integrated, ultra-compact photonic circuit blocks. Our prototype all-dielectric metamaterial-waveguide achieves a low propagation loss of approximately 3.7±1.0 dB/cm, comparable to those of silicon strip waveguides. Our approach marks a departure from interference-based confinement as in photonic crystals or slot waveguides, which utilize nanoscale field enhancement. Its ability to suppress evanescent waves without substantially increasing the propagation loss shall pave the way for all-dielectric metamaterial-based dense integration. Miniaturization of optical components could give way to dense photonic-integrated circuits. Here, the authors demonstrate the control of evanescent waves using all-dielectric metamaterials and show that they can reduce cross-talk and bending loss, which limit the integration density in photonic circuits.
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影响因子：
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作者：
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