Improving Efficiency and Birefringence of an All-Dielectric Metasurface Quarter-Wave Plate Using Graphene
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Conventional all-dielectric metasurfaces show remarkable properties including high efficiency and tunability of the optical response. However, extreme narrow bandwidth is a limitation that reduce their application in the photonic sensor devices. In this work, an efficient hybrid silicon-graphene metasurface is numerically proposed and designed. Through the sandwiched graphene layer, the structure shows unique quarter-wave properties, tunable through the dimensions of silicon, the Fermi energy of graphene, and an external gate voltage. Dynamic tuning is achieved by reversing the gate voltage: circular polarization state is switched between the right- and the left-handed states by reversing the gate voltage. A 95% polarization conversion ratio and a 96% ellipticity ratio are obtained while converting linearly polarized light into circularly polarized light in the near infrared. Additionally, by integrating graphene with silicon, the Q-factor and the trapped magnetic modes in the silicon are effectively modulated. The structure is compact and has an ultrathin design thickness of ∼0.1 λ, in the telecommunication wavelength. The above properties are essential for integration into photonic sensing devices and for compatibility with the CMOS devices.
KeywordsMetamaterials Polarization converter All-dielectric metasurface
This work was supported by the National Key Basic Research Program of China (No. 2013CB328702) and the National Natural Science Foundation of China (NSFC) (Nos. 11374074 and 61308069).
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