Enhancement of Terahertz radiation due to excitation of SPW on graphene strip coated on GaAs structure

Abstract

The present study proposes a methodology for improving terahertz (THz) radiation through the utilisation of a laser directed towards a graphene strip that has been coated onto a GaAs structure. The presence of a non-uniform voltage results in the production of a transient current when the laser interacts with GaAs material. The generation of THz radiation is attributed to the current that is produced along the length of GaAs structures. Concurrently, a portion of the laser beam interacts with the graphene strip, inducing a surface plasma wave (SPW) that propagates along the surface of the graphene. The amplitude of the SPW experiences an exponential decay as it travels away from the interface in both the media. The impact of the transverse electric field of surface plasmon waves in graphene on the transient current in GaAs material has been observed to enhance THz radiation. The frequency of the SPW increases in a parabolic manner as the graphene strip increases with rises with rise in propagation vector. The plasmonics (Graphene plasmons: GPs) approach used for the proposed model enables us to making the emitted radiation suitable for Terahertz spectroscopy, imaging and non-destructive testing, Highspeed data transfer, Terahertz microscopy, Terahertz microscopy, Terahertz microscopy, Quantum technology.