Directional beaming of light from a subwavelength metal slit with phase-gradient metasurfaces Academic Article uri icon

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abstract

  • In this article, we demonstrate directional beaming of light from a metal nanoslit surrounded with phase-gradient metasurfaces on both sides. Distinct from the grating-based beaming structures, here the momentum mismatch between the surface wave and radiation wave is overcome by the phase-gradient metasurfaces. The deviation angle of the directional beam can be flexibly adjusted by appropriately arranging the phase-gradient of metasurfaces on each side of the nanoslit. The metasurface-based beaming structures also present the ability to operate with high diffraction efficiency and small divergence angle, implying various potential applications in nanophotonics.

authors

  • Zhu, Hua
  • Yin, Xiang
  • Chen, Lin
  • Li, Xun

publication date

  • December 2017