Polarimetric Investigations on Coupled Plasmons and Plasmonic Fano Resonances

Singh, Ankit Kumar (2015) Polarimetric Investigations on Coupled Plasmons and Plasmonic Fano Resonances. Masters thesis, Indian Institute of Science Education and Research Kolkata.

PDF (MS thesis of Ankit Kumar Singh (13IP027)) Ankit_Kumar_Singh-13IP027.pdf - Submitted Version Restricted to Repository staff only Download (4MB)

Abstract

Plasmonics dealing with localized/ surface plasmon resonances in metal nanoparticles (nanostructures) / planar metal-dielectric interfaces is a rapidly developing field and is under recent intensive investigations owing to fundamental interests and numerous po- tential applications. Various optical effects of such plasmonic nanostructures have been studied, ranging from extinction, absorption, scattering properties to non-linear proper- ties and so forth. Despite this, there has only been limited literature available dealing with polarization characteristics of such plasmonic systems. Since the polarization prop- erties of light play an important role in the interaction of light with such plasmonic systems, knowledge on the polarimetry parameters of the system and their spectral char- acteristics are crucial both for fundamental understanding of the interactions and for the optimization of experimental parameters for many practical applications. The thesis aims to explore the quantitative Mueller matrix polarimetric aspects in complex plas- monic systems (like metal nanoparticle / nanostructure arrays, clusters of nanoparticles and nanostructures etc.) to understand / interpret some of the intriguing aspects of nano- plasmonics, like coupled plasmons, plasmonic fano resonances, spin orbit interaction of light in plasmonic nanostructures, via the intrinsic plasmon polarimetry characteristics. Specifically, the interfering neighbouring resonance modes role in the aforementioned ef- fects in various complex plasmonic systems would be interpreted, analysed/quantified using the Mueller matrix-derived scattering polarimetry parameters, namely, diattenu- ation (difierential attenuation of orthogonal polarization states) and retardance (phase shift between orthogonal polarization states). Finally, the information obtained from these basic studies will be explored for developing/optimizing novel sensing schemes.

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