Terahertz wavefront manipulation in graphene metalens for dual polarization incidences

Yuhui Zhang; Yuegang Fu

doi:10.1117/12.2586174

12 March 2021 Terahertz wavefront manipulation in graphene metalens for dual polarization incidences

Yuhui Zhang, Yuegang Fu

Proceedings Volume 11763, Seventh Symposium on Novel Photoelectronic Detection Technology and Applications; 117630X (2021) https://doi.org/10.1117/12.2586174
Event: Seventh Symposium on Novel Photoelectronic Detection Technology and Application 2020, 2020, Kunming, China

Abstract

We proposed a metalens structure based on graphene in the Terahertz (THz) regime by using the finite-difference timedomain method. The structure consists of two layers of graphene arrays, polymer dielectric spacer and a gold mirror film. The proposed metalens can realize two functions. The first function is to control x-polarized incidence and y-polarized incidence respectively by two layers of graphene, that is, to regulate x-polarized incidence when the working voltage is applied to the lower graphene and 0 voltage is applied to the upper graphene. When the working voltage is applied to the upper graphene and the 0 voltage is applied to the lower graphene, y-polarized incidence is regulated. The second function is to apply 0 voltage to the lower graphene, and regulate both x-and y-polarized incidence by changing the Fermi level of the upper graphene. The simulation results of FDTD show that the metalens structure can not only achieve different functions, but also the focusing effect is in good agreement with the design value. This work provides a new method for wavefront manipulation of metalens.

Citation Download Citation

Yuhui Zhang and Yuegang Fu "Terahertz wavefront manipulation in graphene metalens for dual polarization incidences", Proc. SPIE 11763, Seventh Symposium on Novel Photoelectronic Detection Technology and Applications, 117630X (12 March 2021); https://doi.org/10.1117/12.2586174

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