†School of Engineering and Applied Sciences, Harvard University, 9 Oxford Street, McKay 125, Cambridge, Massachusetts 02138 United States.
‡Singapore Institute of Manufacturing Technology, 71 Nanyang Drive, Singapore 638075, Singapore.
Nano Lett. 2015 May 13;15(5):3585-9. doi: 10.1021/acs.nanolett.5b01076. Epub 2015 Apr 30.
Surface plasmons polaritons (SPPs) are light-like waves confined to the interface between a metal and a dielectric. Excitation and control of these modes requires components such as couplers and lenses. We present the design of a new lens based on holographic principles. The key feature is the ability to switchably control SPP focusing by changing either the incident wavelength or polarization. Using phase-sensitive near-field imaging of the surface plasmon wavefronts, we have observed their switchable focusing and steering as the wavelength or polarization is changed.
表面等离激元极化激元 (SPPs) 是局限于金属和电介质界面的类光波。激发和控制这些模式需要耦合器和透镜等组件。我们提出了一种基于全息原理的新型透镜设计。其关键特点是能够通过改变入射波长或偏振来可切换地控制 SPP 聚焦。通过对表面等离激元波前的相敏近场成像，我们观察到随着波长或偏振的变化，其可切换聚焦和转向。
