Author:
Li Shaopeng,Xu Junhao,Xie Yajie
Abstract
Electromagnetic field confinement is significant in enhancing light-matter interactions as well as in reducing footprints of photonic devices especially in Terahertz (THz). Polaritons offer a promising platform for the manipulation of light at the deep sub-wavelength scale. However, traditional THz polariton materials lack active tuning and anisotropic propagation simultaneously. In this paper, we design a graphene/α-MoO3 heterostructure and simulate polariton hybridization between isotropic graphene plasmon polaritons and anisotropic α-MoO3 phonon polaritons. The physical fundamentals for polariton hybridizations depend on the evanescent fields coupling originating from the constituent materials as well as the phase match condition, which can be severely affected by the α-MoO3 thickness and actively tuned by the gate voltages. Hybrid polaritons propagate with in-plane anisotropy that exhibit momentum dispersion characterized by elliptical, hyperboloidal and even flattened iso-frequency contours (IFCs) in the THz range. Our results provide a tunable and flexible anisotropic polariton platform for THz sensing, imaging, and modulation.
Funder
National Natural Science Foundation of China
Subject
Electrical and Electronic Engineering,Mechanical Engineering,Control and Systems Engineering
Reference26 articles.
1. Beiträge zur Theorie des Mikroskops und der mikroskopischen Wahrnehmung;Abbe;Arch. Für Mikrosk. Anat.,1873
2. THz Near-Field Imaging of Extreme Subwavelength Metal Structures;Chen;ACS Photon,2020
3. THz-to-optical conversion in wireless communications using an ultra-broadband plasmonic modulator;Ummethala;Nat. Photon,2019
4. Yang, F., Pitchappa, P., and Wang, N. Terahertz Reconfigurable Intelligent Surfaces (RISs) for 6G Communication Links. Micromachines, 2022. 13.
5. Polaritons in van der Waals materials;Basov;Science,2016
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献