Bloch oscillations in plasmonic waveguide arrays
Bloch oscillations in plasmonic waveguide arrays
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DOI：
10.1038/ncomms4843
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发表时间：
2014-05-01
影响因子：
16.6
通讯作者：
Linden, S.
中科院分区：
文献类型：
--
作者：
Block, A.;Etrich, C.;Linden, S.
现代纳米纤维技术和先进计算工具的结合为塑造光的流动提供了前所未有的机会。特别是，离散的光子结构可以被设计成使得所得到的光动力学模拟量子力学凝聚态现象。通过将电子波包的时间依赖概率分布映射到相应光子结构中的空间光强分布，可以在相干但经典的波环境中直接可视化量子力学演化。基于这种方法，最近几个研究小组在不同的电介质结构中观察到了离散衍射、布洛赫振荡和齐纳隧道效应。在这里，我们报告的实验观察到的离散衍射和Bloch振荡的表面等离子体激元在倏逝耦合等离子体波导阵列。通过在阵列的纳米加工期间引入适当的横向折射率梯度来定制有效外部电势。我们的实验结果与数值计算非常吻合。
The combination of modern nanofabrication techniques and advanced computational tools has opened unprecedented opportunities to mold the flow of light. In particular, discrete photonic structures can be designed such that the resulting light dynamics mimics quantum mechanical condensed matter phenomena. By mapping the time-dependent probability distribution of an electronic wave packet to the spatial light intensity distribution in the corresponding photonic structure, the quantum mechanical evolution can be visualized directly in a coherent, yet classical wave environment. On the basis of this approach, several groups have recently observed discrete diffraction, Bloch oscillations and Zener tunnelling in different dielectric structures. Here we report the experimental observation of discrete diffraction and Bloch oscillations of surface plasmon polaritons in evanescently coupled plasmonic waveguide arrays. The effective external potential is tailored by introducing an appropriate transverse index gradient during nanofabrication of the arrays. Our experimental results are in excellent agreement with numerical calculations.