Design and simulation of plasmonic structure based on suspended graphene sheets For enhancing third harmonic generation.
Subject Areas : Electronic Engineering
mohammad javad rahimzacdeh
1
,
Rahim Ghayour
2
,
Maryam Mohitpour
3
1 - هیات علمی دانشگاه آزاد اسلامی
2 - Islamic azad university of shiraz
3 - Department of Electrical Engineering- Shiraz Branch, Islamic Azad University, Shiraz, Iran
Keywords: conversion efficiency, suspended graphene, Plasmonic waveguide, Third harmonic.,
Abstract :
In this article, based on the nonlinear property of graphene and placing a layer of graphene on a suitable substrate, a plasmonic waveguide based on suspended graphene has been proposed for the first time to enhance third harmonic generation(THG). The role of different parameters of single-layer graphene in resonance properties and nonlinear conductivity of graphene has been determined. It is shown that by changing the electrochemical potential of graphene, it is possible to tune the THG, which is based on the nonlinear properties of monolayer graphene. The finite difference computing method in the time domain (FDTD) has been used for numerical simulation and analysis of the proposed structure in the mid-infrared wavelength range. In our simulations, the conversion efficiency was calculated at about -48.08 dB, which shows a significant increase compared to other sources. Using high quality graphene samples and floating them and finally using Si3N4 dielectric has improved the performance of the proposed structure compared to other references. The result of this work can be used to develop a wide range of important applications such as new frequency generation, signal processing, chemical sensing and switches in the MIR frequency range.
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