In this work, we present UT-shaped graphene based nano antenna which shows three different resonances. These resonances can be tuned independently.The simulation of the work is done by using finite-difference time-domain (FDTD) method (Lumerical Solutions Inc.). The behavior of the resonance peaks are investigated by changing the geometrical parameters of the antenna. The physical origin of this modes is shown by nearfield calculations. We investigate the effect of chemical potential, period, height and length of antenna and different refractive index of the material on the transmission spectrum. Such graphene geometry can be experimentally achieved by electron beam lithography (EBL)-based nano-fabrication techniques. However, in this work, we theoretically investigate the graphene nano antenna. The optical response of graphene is determined by its conductivity. Since graphene shows semiconducting characteristics, corresponding conductivity of graphene includes inter- and intra-band transitions. The structural analysis based on geometrical parameters are H (height) and L (length). They can tune the resonance peaks. The period and chemical potential also affects the behavior of the multi-band system. The effect of the refractive index on the transmission spectra of the graphene antenna is considered by changing the material of the substrate. The proposed graphene structure stands on a (silicon nitride) SiN substrate. ORCID NO: 0000-0002-5605-3545
Anahtar Kelimeler: antenna, graphene, multi-band
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