Chongyun Wang, Ming Chen, Houquan Liu, Chuanxin Teng, Hongchang Deng, Libo Yuan
https://www.spiedigitallibrary.org/journals/Optical-Engineering/volume-58/issue-4/043106/Wideband-circular-polarization-converter-based-on-graphene-metasurface-at-terahertz/10.1117/1.OE.58.4.043106.short?SSO=1
Linear-to-circular polarization converters are
widely used in optical and microwave systems, but the polarization devices of
traditional materials are untunable, and devices made of graphene materials can
overcome this disadvantage. A circular polarization converter based on graphene
metasurface is designed, whose properties are tunable over a broad range at
terahertz frequencies. With appropriate structural parameters, simulations show
that the axial ratio of reflected electromagnetic wave of the proposed device
is lower than 3 dB in the frequency band of 2.25 to 2.475 THz, which
means the linearly incident polarization can be converted to the circular
polarization wave. The proposed design can also work when the electromagnetic
wave is oblique incidence up to 40 deg with a high polarization conversion
ratio. Moreover, the operating frequency band can be arbitrarily adjusted by
applying a bias voltage.
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