Theoretical Analysis of Double Dielectric Loaded Graphene Surface Plasmon Polariton

Yong, 李勇 Li; Huifang, 张惠芳 Zhang; Tianxin, 范天馨 Fan; Ying, 何英 He; Yan, 王燕 Wang; Lihua, 白丽华 Bai

doi:10.3788/aos201636.0724001

Cited by 1 publication

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“…Moreover, graphene has been shown to provide superior light confinement to the device compared to other materials. Recently, graphene plasmons have gained considerable attention due to their ability to guide light modes at scales much smaller than the wavelength in the air [26][27][28]. Graphene was designed to place at the center of the optical waveguide for large modulation depth [29][30].…”

Section: Introductionmentioning

confidence: 99%

A high figure of merit of phonon-polariton waveguide modes with hBN/SiO 2 /graphene/hBN ribs waveguide in THz range

刘

Zhao

JIN

et al. 2023

Preprint

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The utilization of THz waveguides has enabled a variety of applications in integrated optics and communications. To effectively control THz signals on photonic chips, it is essential to design a waveguide that offers both a high figure of merit (FOM) and low loss. In this paper, we propose a THz waveguide composed of a dielectric rib and a graphene layer sandwiched between two hexagonal boron nitride (hBN) ribs on a gold layer. Numerical simulations demonstrate the existence of two type guided modes of the proposed waveguide in the second reststrahlen band (1360.0cm− 1 < ω < 1609.8cm− 1) of hBN. These modes are formed by coupling the hyperbolic phonon polariton (HPhP) of two hBN rib in the middle dielectric rib and are then modulated by a graphene layer. Interestingly, we found that four waveguide transmission parameters, including an effective length, a figure of merit, a device length and a propagation loss of the guided modes, vary with operation frequency and gate voltage. By altering geometry parameters and dielectric permittivity, the modal properties were analyzed. Simulation results demonstrate that a high FOM of 4.0×107 is achieved by optimizing waveguide size parameters. The proposed waveguide offers a promising approach for designing a tunable THz waveguide on photonic chips, which can be extended to other hyperbolic materials and 2D materials such as MnO3, silicone and germanene.

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