Amplitude- and Phase-Controlled Surface Plasmon Polariton Excitation with Metasurfaces
Amplitude- and Phase-Controlled Surface Plasmon Polariton Excitation with Metasurfaces
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DOI：
10.1021/acsphotonics.5b00536
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发表时间：
2016-01-01
期刊：
影响因子：
7
通讯作者：
Zentgraf, Thomas
中科院分区：
文献类型：
--
作者：
Muehlenbernd, Holger;Georgi, Philip;Zentgraf, Thomas
表面等离子体激元(SPP)由于其强烈的光对金属表面的限制作用，在从物理、化学、生物到集成光子电路等各个领域都显示出了巨大的应用潜力。以可控的方式从自由空间光子激发SPP是迈向更复杂和集成应用的关键一步。将光子耦合到SPP的方法有很多，但为了控制SPP的幅度和相位，这些方法中的大多数都需要笨重或多个光学元件或难以控制的敏感调整。在这里，我们提出了一种新的方法来独立控制由垂直入射光束激发的SPP的幅度和相位。通过对入射光电场的偏振状态和偏振方向角的控制，实现了对幅度和相位的完全控制。我们在实验上演示了这种由周期性纳米天线组成的亚表面在金属介电界面上激发表面等离子体激元的功能。我们的方法为相干可控的集成等离子体电路开辟了新的途径，可以与快速动态偏振调制技术结合使用。
Surface plasmon polaritons (SPPs) have shown high potential for various applications in various fields, ranging from physics, chemistry, and biology to integrated photonic circuits due to their the strong confinement of light to the metal surface. Exciting an SPP from a free-space photon in a controllable manner is an essential step toward more complex and integrated applications. Methods for coupling photons to SPPs are numerous, but in order to control the amplitude and phase of an SPP, most of these methods require bulky or multiple optical components or sensitive adjustments that are difficult to control. Here we present a novel approach for an independent control of the amplitude and phase of an SPP excited by a normally incident beam using a metasurface. The full control in amplitude and phase is achieved via the polarization state and polarization orientation angle of the electrical field of the incoming light. We experimentally demonstrate the functionality of such a metasurface consisting of periodic nanoantennas for the excitation of SPPs at a metal dielectric interface. Our approach opens up new ways for coherently controllable integrated plasmonic circuits that can be used in conjunction with fast dynamic polarization modulation techniques.