Abstract
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.
© 2019 Optical Society of America
Full Article | PDF ArticleMore Like This
Zezhao Ju, Ming Deng, Jian Wang, and Lin Chen
Opt. Lett. 45(10) 2882-2885 (2020)
Hua Zhu, Shuqi Chen, Jing Wen, Jian Wang, and Lin Chen
Opt. Lett. 44(23) 5764-5767 (2019)
Tangxuan Ren and Lin Chen
Opt. Lett. 44(22) 5446-5449 (2019)