Graphene H-Waveguide for Terahertz Lasing Applications: Electromagnetic Quasi-Linear Theory

• Main Author: Guennadi A. Kouzaev
• Format: Article
• Language: English
• Published: MDPI AG 2020-12-01
• Series: Nanomaterials
• Subjects: graphene; terahertz; lasing; graphene H-waveguide
• Online Access: https://www.mdpi.com/2079-4991/10/12/2415

A novel graphene H-waveguide is proposed for active terahertz components. A graphene film illuminated by strong pumping light shorts the parallel conductor plates. The terahertz modes propagating along this film are amplified at certain conditions. A rigorous electromagnetic (EM) quasi-linear method of analytical calculations of <inline-formula><math display="inline"><semantics><mrow><msub><mrow><mi>TE</mi></mrow><mi mathvariant="normal">y</mi></msub></mrow></semantics></math></inline-formula> and <inline-formula><math display="inline"><semantics><mrow><msub><mrow><mi>TM</mi></mrow><mi mathvariant="normal">y</mi></msub></mrow></semantics></math></inline-formula> eigenmodes is used in this paper to select these conditions. Among them is the use of bound <inline-formula><math display="inline"><semantics><mrow><msub><mrow><mi>TE</mi></mrow><mi mathvariant="normal">y</mi></msub></mrow></semantics></math></inline-formula> modes interacting with graphene plasmons at frequencies of negative graphene resistance, minimizing conductor loss associated with parallel plates, and excluding the current-crowding effect from the waveguide design. The limitations of the used theory are considered, and the applications of this waveguide are proposed.