Helicity dependent directional surface plasmon polariton excitation using a metasurface with interfacial phase discontinuity
Helicity dependent directional surface plasmon polariton excitation using a metasurface with interfacial phase discontinuity
复制标题
使用具有界面相不连续性的超表面进行螺旋度相关的定向表面等离子体激元激发
DOI：
10.1038/lsa.2013.26
复制
发表时间：
2013-03-01
影响因子：
19.4
通讯作者：
Zhang, Shuang
中科院分区：
文献类型：
--
作者：
Huang, Lingling;Chen, Xianzhong;Zhang, Shuang
表面等离子体激元（SPPs）由于光对金属表面的强约束作用，已被广泛应用于物理、化学和生物学等各个科学领域。对于许多应用，重要的是自由空间光子可以以可控的方式耦合到SPP。在这封信中，我们应用的概念，界面相位不连续的圆偏振超颖表面的设计一种新型的偏振相关的SPP单向激发法向入射。通过简单地切换入射光的螺旋度，实验证明了在光频下沿沿着相反方向选择性单向激发SPP。这种方法，结合动态偏振调制技术，打开网关集成等离子体电路与电可重构功能。
Surface plasmon polaritons (SPPs) have been widely exploited in various scientific communities, ranging from physics, chemistry to biology, due to the strong confinement of light to the metal surface. For many applications, it is important that the free space photon can be coupled to SPPs in a controllable manner. In this Letter, we apply the concept of interfacial phase discontinuity for circularly polarizations on a metasurface to the design of a novel type of polarization-dependent SPP unidirectional excitation at normal incidence. Selective unidirectional excitation of SPPs along opposite directions is experimentally demonstrated at optical frequencies by simply switching the helicity of the incident light. This approach, in conjunction with dynamic polarization modulation techniques, opens gateway towards integrated plasmonic circuits with electrically reconfigurable functionalities.