Fine-Tuning Plasmonic Response for Plasmon-Enhanced Photonics

Date

2023-12-8

Author

Öztürk, İbrahim Murat

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Plasmonic interactions have found extensive applications in both industrial and fundamental scientific domains owing to scattering, absorption, and electric field enhancement properties of metal nano-structures. The oscillation of metal’s free electrons, driven by the light’s field, results highly geometry-dependent optical response with resonances at specific frequency bands. Tuning the plasmonic response for specific applications requires computer-aided simulations guiding the fabrications. In fact, recent advancements of nano-photonics owe to three collaborative efforts in fabrication, measurements, and simulations. In this thesis, hole mask lithography was chosen as the nano-fabrication method due to its large area compatibility and diverse geometrical potential. This method had successfully used for fabrication of both simple and complex geometries of nano-structures. Innovative approaches to control the surface distribution of nanostructures have been proposed, experimentally explored and yielded promising discussions. Experimental measurements are repeatedly modelled with computational tools. The simulation credibility improved when matching results are obtained from two different computational method, boundary element method and finite element method. Plasmonic coupling is explored with Surface Enhanced Raman Scattering measurements of dimer disc fabrications with varied gap distances, indicating fields intensify at smaller interparticle gaps. A model is invented for quantitation of the plasmonic influence on the efficiency of nano-structure decorated photovoltaics. The model is used for quantitative comparison of various nano-geometries and materials at various physical surface coverages.

Subject Keywords

Nano-optics, Plasmonics, Computational electrodynamics, Nano-fabrication

URI

https://hdl.handle.net/11511/107754

Collections

Graduate School of Natural and Applied Sciences, Thesis