Abstract:
In this review, I introduce the delineation of exciton, it is a bound state of an electron and hole,
which are attracted to each other by the electrostatic Coulomb force. It exists in semiconductors,
insulators, and some liquids, which can transfer energy without transporting net electric charge
and can form a material absorbs a photon of higher energy than its band gap. As well as the
surface Plasmon arises from the collective oscillation of free electron induced by the
electromagnetic field of light and can be used for investigating the interaction between light and
matter beyond the diffraction limit. The coupling interaction between exciton and localized
surface Plasmon can dividing in to two major groups, which are strong and weak interaction. In a
strong exciton-Plasmon coupling regime, a coherent coupling between LSPs and excitons
overwhelms all losses and results in two new mixed hybrid states of light. Quantum information
processing, modification of rate of reaction, low threshold laser and promotion of chemical
reaction are application of strong coupling interaction. In other way for weak coupling
interaction, the enhancement mechanisms of Surface enhancement Raman spectroscopy have
been classified into two categories, electromagnetic mechanism (EM), which is directly induced
by Plasmon resonances of metal nanostructures, has long been discussed and experimentally
confirmed using single-particle spectroscopy and chemical enhancement or chemical effects
(CE) is associated with charge transfer, also known as charge transfer resonance
