Conformal surface plasmons propagating on ultrathin and flexible films
Conformal surface plasmons propagating on ultrathin and flexible films
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在超薄柔性薄膜上传播的共形表面等离子体
DOI：
10.1073/pnas.1210417110
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发表时间：
2013-01-02
影响因子：
11.1
通讯作者：
Garcia-Vidal, Francisco J.
中科院分区：
文献类型：
--
作者：
Shen, Xiaopeng;Cui, Tie Jun;Garcia-Vidal, Francisco J.
表面等离子激元（SPPs）是沿金属和电介质之间的界面传播的局域表面电磁波。由于其固有的亚波长限制，spp具有很强的潜力，可以成为建立在二维金属表面上的一种光子电路的基石；然而，为了制造先进的功能器件，难以在曲面上对spp进行统一灵活的控制。在这里，我们提出了共形表面等离子体（CSPs）的概念，表面等离子体波可以在超薄和柔性薄膜上以微波到中红外频率的宽带范围长距离传播。我们在厚度比工作波长小600倍的纸状介质薄膜上实验实现了这些CSPs。这种柔性的纸状薄膜可以弯曲、折叠，甚至扭曲来塑造csp的流动。
Surface plasmon polaritons (SPPs) are localized surface electromagnetic waves that propagate along the interface between a metal and a dielectric. Owing to their inherent subwavelength confinement, SPPs have a strong potential to become building blocks of a type of photonic circuitry built up on 2D metal surfaces; however, SPPs are difficult to control on curved surfaces conformably and flexibly to produce advanced functional devices. Here we propose the concept of conformal surface plasmons (CSPs), surface plasmon waves that can propagate on ultrathin and flexible films to long distances in a wide broadband range from microwave to mid-infrared frequencies. We present the experimental realization of these CSPs in the microwave regime on paper-like dielectric films with a thickness 600-fold smaller than the operating wavelength. The flexible paper-like films can be bent, folded, and even twisted to mold the flow of CSPs.