Finite Element Method Simulation of Plasmonic Nanostructures

Gupta, Angad (2018) Finite Element Method Simulation of Plasmonic Nanostructures. Masters thesis, Indian Institute of Science Education and Research Kolkata.

PDF (MS dissertation of Angad GUPTA (13MS009)) 13MS009.pdf - Submitted Version Restricted to Repository staff only Download (2MB)

Abstract

The light scattering polarization properties of plasmonic nanostructures are notable due to a fundamental interest in their physics and in their applications. Studying coupled plasmonic systemswhich exhibit asymmetric spectral response to different incident and detected light polarization allows us to tune their optical properties such as diattenuation, retardance, and depolarization. The Fano resonance type spectral response is one such interesting phenomenon. Solving for their scattered light field analytically is difficult. Hence, in this work we show how numerical models can be used to help in this regard. Specifically a commercially available Finite Element method software is used to model the plasmonic systems. We show how they can be efficiently computed and discuss some results. We focus on two systems here, a waveguide plasmonic grating and a heptamer oligomer structure. The polarization properties of these structures is recorded and a numerically derived Mueller matrix of the oligomer is obtained. To the best of our knowledge this is the first time that an FEM simulation has been used to derive the Mueller matrix of a coupled plasmonic structure. Additionally we show how the functionality of the software can be extended to approximately simulate a dark field incident beam.

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