11343

10419

كارشناسي ارشد

مخابرات ميدان

اصفهان، دانشگاه صنعتي اصفهان، دانشكده برق و كامپيوتر

1395

چهارده، 75ص.: مصور

رضا صفيان

ذاكر حسين فيروزه، اصغر غلامي

1395/04/27

مهندسي برق و كامپيوتر

ID10419

Analysis and Simulation of Plasmonic Wave guiding Structure in Terahertz Frequency Band with Higher Confinement Mohsen Rezaei mohsen rezaei@ec iut ac ir April 18 2016 Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Dr Reza Safian rsafian@cc iut ac ir Abstract Optical waveguides which are based on surface plasmon polariton are excellent solutions torealize photonic integrated circuits PICs since they break down the diffraction limit in photonicsystems Although surface plasmon polaritons have been known in the optical region for quite awhile investigating them in the THz band is a pretty new issue In the case of terahertz regime in spite of the fact that SPPs have longer propagation length power confinement on the metalsurface is weak Hence it is not practical to use metal dielectric interface One solution tomimic optical SPP behavior in low frequency region is graphene based plasmonic waveguides Doped graphene plasmons have a wavelength of p that is 1 3 orders of magnitude smallerthan the light wavelength of 0 As a result graphene plasmons are able to be confined down tovolumes that are several orders of magnitude smaller than plasmons in noble metals However similar to metal plasmon graphene plasmon suffers from high absorption loss To balance thepropagation length and modal size graphene based hybrid plasmonic terahertz waveguide wasproposed In this research we propose two novel graphene based hybrid plasmonic waveguides for thefrequency of 3 terahertz Theoretically we analyse them and the modal properties of the pro posed structures are investigated by means of finite element method FEM using COMSOLMultiphysics software Not only do we enhance field confinement in the gap but also we in crease propagation length by the proposed structures Doing this we tackle the trade off betweenconfinement and propagation length Key Words Hybrid Plasmonic Terahertz Waveguide Surface Plasmon Polariton Graphene

رضا صفيان

ذاكر حسين فيروزه، اصغر غلامي