Nonreciprocal metasurface with space-time phase modulation.,Light: Science & Applications

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Nonreciprocal metasurface with space-time phase modulation.
Light: Science & Applications ( IF 20.6 ) Pub Date : 2019-12-18 , DOI: 10.1038/s41377-019-0225-z
Xuexue Guo ₁ , Yimin Ding ₁ , Yao Duan ₁ , Xingjie Ni ₁

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Creating materials with time-variant properties is critical for breaking reciprocity that imposes fundamental limitations on wave propagation. However, it is challenging to realize efficient and ultrafast temporal modulation in a photonic system. Here, leveraging both spatial and temporal phase manipulation offered by an ultrathin nonlinear metasurface, we experimentally demonstrated nonreciprocal light reflection at wavelengths around 860 nm. The metasurface, with travelling-wave modulation upon nonlinear Kerr building blocks, creates spatial phase gradient and multi-terahertz temporal phase wobbling, which leads to unidirectional photonic transitions in both the momentum and energy spaces. We observed completely asymmetric reflections in forward and backward light propagations over a large bandwidth around 5.77 THz within a sub-wavelength interaction length of 150 nm. Our approach highlights a potential means for creating miniaturized and integratable nonreciprocal optical components.

中文翻译：

具有时空相位调制的不可逆超颖表面。

创建具有时变特性的材料对于打破互惠性至关重要，因为互惠性对波的传播施加了根本性的限制。然而，在光子系统中实现有效且超快的时间调制具有挑战性。在这里，利用超薄非线性超颖表面提供的空间和时间相位控制，我们通过实验证明了在860 nm左右的波长下不可逆的光反射。在非线性Kerr构件上进行行波调制的超表面会产生空间相位梯度和多太赫兹时间相位摆动，从而导致动量和能量空间中的单向光子跃迁。我们在大约5的大带宽上观察到了向前和向后的光传播中的完全不对称反射。在150 nm的子波长相互作用长度内为77 THz。我们的方法强调了一种潜在的方法，可用于创建小型且可集成的不可逆光学组件。

更新日期：2019-12-19

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