Chen Yu-Hui, Zhang Mingqian, Gan Lin, Wu Xiaoyu, Sun Lin, Liu Ju, Wang Jia, Li Zhi-Yuan
Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
Opt Express. 2013 Jul 29;21(15):17558-66. doi: 10.1364/OE.21.017558.
We present a direct-method solution toward the general problem of plasmonic wavefront manipulation and shaping to realize pre-designated functionalities based on the surface-wave holography (SWH) method. We demonstrate theoretically and experimentally the design and fabrication of holographic plasmonic lenses over surface plasmons with complex wavefront profiles. We show that visible light at 632.8 nm transmitting through a high-aspect-ratio slit or a micro-rectangle hole in a silver film can be focused to a preset three-dimensional point spot in free space via appropriately manipulating the interaction of excited surface plasmons with the nanoscale groove pattern of the holographic lens. The experiment results of scanning near-field optical microscopy for measuring the three-dimensional optical field distribution agree well both with designs and with numerical simulations, and this strongly supports the effectiveness and efficiency of the SWH method in the design of plasmonic devices that can fulfill manipulation and transformation of complicated-profile surface plasmons.
我们提出了一种直接方法，用于解决基于表面波全息术（SWH）方法的等离子体波前操纵和整形的一般问题，以实现预先指定的功能。我们在理论和实验上证明了具有复杂波前轮廓的表面等离子体全息等离子体透镜的设计与制造。我们表明，通过适当操纵激发的表面等离子体与全息透镜的纳米级凹槽图案的相互作用，632.8nm的可见光透过银膜中的高纵横比狭缝或微矩形孔可以聚焦到自由空间中的预设三维点光斑。用于测量三维光场分布的扫描近场光学显微镜的实验结果与设计和数值模拟都非常吻合，这有力地支持了SWH方法在设计能够实现复杂轮廓表面等离子体的操纵和变换的等离子体器件中的有效性和效率。
