# Nonlinear plasmonic switching in graphene stub nanoresonator loaded with core-shell quantum dot

## TL;DR

This paper theoretically investigates nonlinear plasmonic switching in a graphene-based nanoresonator loaded with a quantum dot, demonstrating control over signal transmission at near-infrared frequencies with potential for high-speed all-plasmonic transistors.

## Contribution

It introduces a novel model of an all-plasmonic graphene transistor utilizing a stub nanoresonator with quantum dot loading, achieving high-speed switching at nanoscale dimensions.

## Key findings

- Strong coupling and narrowband resonance conditions are established.
- Switching from destructive to constructive interference is demonstrated.
- A graphene transistor with 25 nm size and 100 GHz operation frequency is proposed.

## Abstract

We study theoretically a problem of nonlinear interaction between two surface plasmon-polariton (SPP) modes propagating along the graphene waveguide integrated with a stub nanoresonator loaded with a core-shell quantum dot (QD). The conditions of strong coupling and very narrowband resonance for Ladder-type SPP-QD interaction in nanoresonator leading to $\pi$-phase shift of signal SPP mode are established and discussed. Using the full-wave electromagnetic simulation we demonstrate that turning on the pump SPP leads to a transition from destructive to constructive interference in the stub nanoresonator and subsequent effect of switching from locking to transmitting the signal SPP through the waveguide. On the base of the obtained results we develop the model of all-plasmonic graphene transistor with optimized characteristics including the size about $25$ nm and the clock frequency about $100$ GHz functioning at the near-infrared wavelength range.