Browsing by Author "Zaman, Kashpia"

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    Graphene based surface Plasmon polariton for plasmonic waveguide and devices
    (BRAC University, 2020-09) Nur, Salman Sadat; Zaman, Kashpia; Sarker, Md. Ashaduzzaman; Zarif, Abrar; Mohsin, Abu S.M.
    2D graphene was first discovered in 2004 and then it has gained admiration within scientific community due to its extraordinary electrical, mechanical, chemical and optical property. In this study, first we investigated the surface conductivity material model for graphene where we have found out that it is very much useful to characterize graphene modeling using a surface conductivity, which would help us to model graphene for other simulation. Then we demonstrated surface plasmon polarization for plasmonic waveguide and devices. Moreover, we showed optical absorption of a monolayer graphene and demonstrated maximum absorption rate of periodically patterned graphene. Then finally, using all these we designed an electro-optical modulator (EOM) and waveguides and devices based on graphene coated waveguide where we modulate the transmission and absorption rate of the modulator. To do these experiments, we performed extensive numerical simulation using Lumerical FDTD, MODE, DEVICE solver based Lumerical software and verified the numerical results with available analytical analysis