Reza Ghayoor, Alireza Keshavarz,
Volume 13, Issue 1 (1-2019)
Abstract
By developing the terahertz (THz) technology, in addition to generators and detectors of THz waves, the existence of some tools such as modulators and filters are needed. THz filters are important tools for various applications in the field of chemical and biological sensors. Linear and nonlinear optical properties of the graphene have attracted lots of attention. In fact graphene exhibits various nonlinear phenomena. Hence in this paper, by entering the graphene to the field of THz and using the graphene nonlinear properties with utilizing the transfer matrix method and transmission properties of a periodic structure containing graphene are investigated. A fairly straightforward computational method allows us to examine the effect of different structural parameters on the transmittance spectrum. Simulation results show that if the graphene nonlinear response in a periodic structure in the presence of a high-intensity THz field is considered, the proposed structure displays two bands of passes and stopping which can improve the design of the filters and controllers of THz waves.
Ferydon Babaei,
Volume 16, Issue 1 (1-2022)
Abstract
In this study, the interaction of surface plasmon polariton and surface exciton at the interface of a plasmonic medium and a dielectric medium with a C-shaped column morphology consisting of exciton molecules theoretically and classically was investigated in the Kretschmann configuration using the transfer matrix method. The optical absorption spectra of surface plasmon polariton, surface exciton, and surface plexciton have been depicted. The results showed that when the surface plasmon polariton frequency is equal to or close to the frequency of the surface exciton, the polariton mode has two branches, high and low. The mode splitting is caused by the interaction of the surface plasmon polariton and the surface exciton. The characteristics of the splitting energy were analyzed at different structural parameters. The being surface of the plasmon, exciton, and plexciton waves and their localization at the interface between plasmonic and dielectric media were proved by the time averaged Poynting vector and the local absorption.
