Elsevier

Results in Physics

Volume 21, February 2021, 103834
Results in Physics

Deep subwavelength graphene-dielectric hybrid plasmonic waveguide for compact photonic integration

https://doi.org/10.1016/j.rinp.2021.103834Get rights and content
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Highlights

  • High-performance for deeply confined light transmission in terahertz domain.

  • Ultra-small mode area (~10−4λ2) and long propagation length (tens of micrometers).

  • Ultra-low crosstalk between two parallel GDHPWs can be achieved.

Abstract

In this paper, we propose a novel graphene-dielectric hybrid plasmonic waveguide (GDHPW). The fundamental hybrid mode characteristics guided by the GDHPW are numerically investigated. The results show ultra-small mode area (~10−4λ2) and long propagation length (tens of micrometers) can be simultaneously realized by tuning the key geometric structure parameters and the chemical potential of graphene. In addition, we also analyze the crosstalk properties about the two GDHPWs placed on a substrate and ultralow crosstalk can be achieved. Moreover, several alternative modified structures with remarkable optical confinement performances are proposed. The GDHPW with strong optical confinement is expected to serve as a fundamental building block for various tunable high-density integrated photonic components and devices.

Keywords

Graphene
Plasmonic waveguides
Subwavelength confinement
Terahertz

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