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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 18,
  • Issue 9,
  • pp. 092401-
  • (2020)

Plasmonic Luneburg lens and plasmonic nano-coupler

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Abstract

In a single nanoscale device, surface plasmon polaritons (SPPs) have potential to match the different length scales associated with photonics and electronics. In this Letter, we propose an accurate design of a plasmonic metasurface Luneburg lens (PMLL) accommodating SPPs. The simulations indicate that the full width at half-maximum is 0.42 μm, and the focus efficiency is 78%. The characters of a PMLL have robustness to manufacturing errors. The PMLL is applied in a 10 μm long compact coupler model, which couples the SPPs to the 40 nm wide output waveguide. The couple efficiency is higher than that of a conventional taper coupler in a broad bandwidth. The design is compatible with standard lithography technology.

© 2020 Chinese Laser Press

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