AUTHOR=Wang Shaona , Su Mengya , Tang Longhuang , Li Xianguo , Li Xiuyan , Bai Hua , Niu Pingjuan , Shi Jia , Yao Jianquan 

TITLE=Graphene-coated D-shaped terahertz fiber modulator

JOURNAL=Frontiers in Physics

VOLUME=11

YEAR=2023

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2023.1202839

DOI=10.3389/fphy.2023.1202839

ISSN=2296-424X

ABSTRACT=<p>A terahertz (THz) fiber is of interest due to low loss and easy beam shaping. Graphene plays an important role in modulating the optical signal. In this paper, a graphene-coated D-shaped THz fiber modulator is proposed. The performance of the proposed modulator is investigated by the finite element method. The inference of geometric parameters of the structure on the proposed modulator is also analyzed, and an optimal structure is obtained. Simulation results show that the confinement loss and the full width at half-maximum (FWHM) can be tuned by adjusting the Fermi level of graphene. The proposed THz fiber modulator shows potential in future THz fiber communications.</p>