Distributed Circuit Modeling of Plasmonic Nanostructures

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Rezaei, Mohsen | 2012

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 43171 (05)
University: Sharif University of Technology
Department: Electrical Engineering
Advisor(s): Mehrany, Khashayar
Abstract:
The existing transmission line models of plasmonic nanostructures are modified in this thesis to study the electromagnetic characteristics of nano-plasmonic structures in a more efficeint yet accurate enough fashion. First, rectangular plasmonic cavities made by carving dielectric rectangles within a metallic region are modeled by trasnmission lines of finite length being appropriately terminated at their both ends. The resonance conditon in the proposed model yeilds the resonance frequencies, quality factors, and mode profiles of its correspondig plasmonic resonator. The accuracy of the proposed model is assessed by using the fully numerical finite-difference time-domain method (FDTD) technique. The proposed model is appropriate for analysis and design purposes. Second, tooth-shaped plasmonic filters are modeled. This type of filteres are quitecommon in both microwave and optics. Finally, coupled plasmonic metal-insulator-metal waveguides are modeled; and thus, plasmonc directional couplers and side coupled rectangular plasmonic resonators are designed. This model is then generalized to analyze *n* parallel plasmonic waveguides
Keywords:
Transmission-line Model ; Filters ; Couplers ; Equivalent Circuits ; PLasmonic Structure

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