Open AccessBandwidth broadening of a graphene-based circular polarization converter by phase compensation
Author(s) -
Xi Gao,
W. L. Yang,
Weihua Cao,
Ming Chen,
Yannan Jiang,
Xiaoxiao Yu,
Haiou Li
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.023945
Subject(s) - graphene , optics , circular polarization , polarization (electrochemistry) , ground plane , materials science , broadband , bandwidth (computing) , optoelectronics , dielectric , physics , telecommunications , microstrip , chemistry , computer science , antenna (radio) , nanotechnology
We present a broadband tunable circular polarization converter composed of a single graphene sheet patterned with butterfly-shaped holes, a dielectric spacer, and a 7-layer graphene ground plane. It can convert a linearly polarized wave into a circularly polarized wave in reflection mode. The polarization converter can be dynamically tuned by varying the Fermi energy of the single graphene sheet. Furthermore, the 7-layer graphene acting as a ground plane can modulate the phase of its reflected wave by controlling the Femi energy, which provides constructive interference condition at the surface of the single graphene sheet in a broad bandwidth and therefore significantly broadens the tunable bandwidth of the proposed polarization converter.