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Experimental demonstration of tunable directional excitation of surface plasmon polaritons with a subwavelength metallic double slit

机译：亚波长金属双缝表面等离子激元可调谐定向激发的实验证明

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摘要

We demonstrate experimentally the directional excitation of surface plasmon polaritons (SPPs) on a metal film by a subwavelength double slit under backside illumination, based on the interference of SPPs generated by the two slits. By varying the incident angle, the SPPs can be tunably directed into two opposite propagating directions with a predetermined splitting ratio. Under certain incident angle, unidirectional SPP excitation can be achieved. This compact directional SPP coupler is potentially useful for many on-chip applications. As an example, we show the integration of the double-slit couplers with SPP Bragg mirrors, which can effectively realize selective coupling of SPPs into different ports in an integrated plasmonic chip. © 2011 American Institute of Physics.
机译：我们基于两个缝隙所产生的SPP的干扰，在背面照明下，通过亚波长双缝隙，实验证明了金属膜上的表面等离振子极化子（SPPs）的定向激发。通过改变入射角，可以将SPP以预定的分光比可调谐地指向两个相反的传播方向。在一定的入射角下，可以实现单向的SPP激发。这种紧凑的定向SPP耦合器可能对许多片上应用有用。例如，我们展示了双缝耦合器与SPP布拉格镜的集成，可以有效地将SPP选择性耦合到集成等离子体芯片中的不同端口。 ©2011美国物理研究所。

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  • 来源
    《Applied Physics Letters》 |2011年第25期|p.251109.1-251109.3|共3页
  • 作者

    Xiaowei Li; Qiaofeng Tan; Benfeng Bai; Guofan Jin;

  • 作者单位

    Department of Precision Instruments, State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University, Beijing 100084, People's Republic of China,Tsinghua-Foxconn Nanotechnology Research Center, Tsinghua University, Beijing 100084,People's Republic of China;

    Department of Precision Instruments, State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University, Beijing 100084, People's Republic of China;

    Department of Precision Instruments, State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University, Beijing 100084, People's Republic of China,Tsinghua-Foxconn Nanotechnology Research Center, Tsinghua University, Beijing 100084,People's Republic of China,Department of Physics and Mathematics, University of Eastern Finland, P.O. Box 111,FI-80101 Joensuu, Finland;

    Department of Precision Instruments, State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University, Beijing 100084, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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