Adiabatic following of terahertz surface plasmon-polaritons coupler via two waveguides structure

TL;DR

This paper introduces a novel two-waveguide design for broadband terahertz surface plasmon-polariton couplers using adiabatic following, simplifying previous three-waveguide methods and potentially enhancing THz communication systems.

Contribution

It proposes a new two-waveguide coupler design employing adiabatic following and introduces the detuning parameter into the coupling equations for the first time.

Findings

Successful design of a broadband THz SPPs coupler with two waveguides.

Introduction of detuning parameter improves coupling control.

Potential to enhance THz communication applications.

Abstract

Most recently, two remarkable papers [New J. Phys. 21, 113004 (2019); IEEE J. Sel. Top. Quantum Electron 27, 1 (2020)] propose broadband complete transfer terahertz (THz) surface plasmon polaritons (SPPs) waveguide coupler by applying coherent quantum control -- Stimulated Raman adiabatic passage (STIRAP). However, previous researches request three SPPs waveguides coupler. In this paper, we propose a new design of a broadband complete transfer THz SPPs coupler with an innovative structure of two waveguides by employing two state adiabatic following. In order to realize this design, we introduce the detuning parameter into the coupling equation of SPPs waveguides for the first time. We believe that this finding will improve the THz communication domain.