Coherent control of Surface Plasmon Polaritons Excitation via tunneling-induced transparency in quantum dots

Abstract

A scheme for coupler-free excitation of Surface Plasmon Polaritons (SPPs) based on tunneling-induced transparency (TIT) is proposed. The system consists of a top layer of metal film and a bottom layer made of a quantum dot (QD) medium with a permittivity less than one. The QD medium is engineered to exhibit the TIT phenomenon. Absorption losses in the QD medium, which reduce the field enhancement required for efficient SPP excitation, can be minimized by applying a magnetic field between the quantum dots. By utilizing TIT and manipulating the QDs with an external magnetic field, the system aims to optimize the conditions for SPP generation and increase the propagation length. Moreover, the group velocity of SPPs can be adjusted from slow to fast propagation using tunneling voltage. Efficient SPP excitation is crucial for developing devices such as plasmonic waveguides and high-sensitivity sensors.