Journal
OPTICS LETTERS
Volume 44, Issue 13, Pages 3382-3385Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.44.003382
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Funding
- National Natural Science Foundation of China (NSFC) [11474116, 11674118, 11774186]
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Gradient metasurfaces have offered a promising approach to achieve high-efficiency conversion between surface plasmons (SPs) and propagating waves (PWs), and hence have found numerous applications in photonics. However, the available SP-PW couplers lack flexibility for active control, which limits their use in practice. Graphene-based meta-couplers are proposed to realize dynamical SP-PW conversion by providing a tunable phase shift to the scattering SPs by means of chemical potential modulation of graphene. In-plane/out-of-plane SP-PW conversions are demonstrated with graphene ribbon/block-based meta-couplers. Converting SPs to single or two beams of PWs with variable radiation angles is realizable by varying the chemical potential of graphene without re-optimizing the structural parameters. (C) 2019 Optical Society of America
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