Mueller Matrix Spectroscopy of Oligomers

Aneeth, K. A. (2017) Mueller Matrix Spectroscopy of Oligomers. Masters thesis, Indian Institute of Science Education and Research Kolkata.

PDF (MS dissertation of Aneeth.K.A. (12MS053)) 12MS053.pdf - Submitted Version Restricted to Repository staff only Download (2MB)

Abstract

Plasmonics which is the study of interaction between electromagnetic field and free electron metal has attracted the attention due to its unique properties.One among such property is surface plasmon resonance.The surface plasmon resonance in metal nanoparticles and nano-structures are being pursued for numerous practical applications in various branches of science and technology such as Ultra-high sensitive chemical and biomedical sensing,bio-molecular manipulation,labeling,detection,contrast enhancement in biomedical imaging etc.Many fundamental effects have been observed in plasmonics. One among them is Fano-Resonance.It exhibits asymmetric line shape originating from the interference of a narrow resonance with a broad spectral line or continuum states is a universal phenomenon which is observed in classical and quantum systems.It has been under recent investigation because of its numerous potential applications in sensors,switching,lasing,cloaking,filters,Robest color display,non-linear and slow light devices ans so forth.In this thesis, we have demonstrated the simple yet elegant approach for probing, tuning the interference effect and the resulting asymmetric line shape in anisotropic fano resonant systems of Plasmonic Oligomers by Mueller Matrix based polarization analysis.This approach is based on generalized model of Fano resonance in scattering and tunability is achieved by controlling the Fano Phase Shift and the relative amplitudes of the interfering modes by pre and post selection polarization states of light.The ability to probe,manipulate and desirably tune the interference effect and the resulting spectral line shape by Mueller Matrix-based polarization state control enable the new insights and various promising applications of polarization-optimized anisotropic Fano resonant systems.In addition to this work,we are currently exploring one more application of plasmon resonance,biomolecule sensing.We could come up with some initial results to demonstrate the stability of anti-fouling surface.That is basically the study of protein adsorption on a polymer coated gold nano-particle using dark field microscope.

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