High-efficiency surface plasmon meta-couplers: concept and microwave-regime realizations

Wujiong Sun; Qiong He; Shulin Sun; Lei Zhou

doi:10.1038/lsa.2016.3

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High-efficiency surface plasmon meta-couplers: concept and microwave-regime realizations

Original Articles

- High-efficiency surface plasmon meta-couplers: concept and microwave-regime realizations
- Light: Science & Applications Vol. 5, Issue 1, (2016)
- Affiliations：
  
  1.State Key Laboratory of Surface Physics and Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Fudan University, Shanghai 200433, China
  2.Collaborative Innovation Center of Advanced Microstructures, Fudan University, Shanghai 200433, China
  3.Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing, Green Photonics and Department of Optical Science and Engineering, Fudan University, Shanghai 200433, China
- Author bio：
  
  SL Sun, Email: sls@fudan.edu.cn
  L Zhou, Email: phzhou@fudan.edu.cn
- Funds：
- DOI：10.1038/lsa.2016.3
  CLC：
- Published：2016-03，
  
  Published Online：23 August 2015，
  
  Received：27 March 2015，
  
  Revised：14 July 2015，
  
  Accepted：21 July 2015
- Accepted：
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Sun, W. J. et al. High-efficiency surface plasmon meta-couplers: concept and microwave-regime realizations. Light: Science & Applications, 5, e16003 (2016).
DOI：

Sun, W. J. et al. High-efficiency surface plasmon meta-couplers: concept and microwave-regime realizations. Light: Science & Applications, 5, e16003 (2016). DOI： 10.1038/lsa.2016.3.

摘要

Abstract

Surface plasmon polaritons (SPPs) and their low-frequency counterparts (i.e.

spoof SPPs on artificial surfaces) have recently found numerous applications in photonics

but traditional devices to excite them (such as gratings and prism couplers) all suffer from problems of inherent low efficiency because the generated SPPs can decouple

returning to free space

and reflections at the device surface can never be avoided. Here

we propose a new SPP excitation scheme based on a transparent gradient metasurface and numerically demonstrate that it exhibits inherently high efficiency (~94%) because the designed meta-coupler suppresses both decoupling and surface reflections. As a practical realization of this concept

we fabricated a meta-coupler for operation in the microwave regime and performed near-field and far-field experiments to demonstrate that the achieved excitation efficiency for spoof SPPs reaches ~73%

which is several times higher than that achieved by other available devices in this frequency domain. Our findings can motivate the design and fabrication of high-performance plasmonic devices to harvest light–matter interactions

particularly those related to spoof SPPs in the low-frequency domain.

关键词

Keywords

metamaterialmetasurfaceplasmonic couplersurface plasmon polariton

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