Design of multicomponent nanostructured surfaces with tailored optical properties
Geldmeier, Jeffrey A.
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Two promising ways of manipulating light-matter interactions at the nanoscale are through the use of noble metal plasmonic nanostructures and quantum dots. However, the majority of previous studies focus on single particle properties in solution instead of in mesoscale, organized, substrate-bound arrays and films. Understanding and guiding the assembly behavior of nanostructures in a large-scale, bottom-up, and controllable manner has important ramifications for controlling resultant unique properties for emerging optical applications. The primary goal of this research is therefore understanding, both experimentally and computationally, the principles that govern plasmonic and emissive properties of nanostructure assemblies that possess novel emergent optical properties. This work was focused into three concrete tasks for understanding, controlling, and tuning nanoscale optical properties through the use of nanoparticle coupling interactions, polymeric components, and large-scale assemblies: • Understanding the nanostructure assembly fundamentals that can result in broadband absorbing plasmonic nanostructure assemblies through controlled coupling and assembly behavior; • Gaining insight into the various morphologies of conjugated polymer and plasmonic nanostructure composites and how their combination can be utilized for reversible and stimuli-responsive plasmonic resonances; • Examining the morphology of quantum dot/polymer composite films and how their interfacial properties can be altered for the enhancement of quantum dot fluorescence using dewetting-induced far-field scattering. Overall, the integration of multiple components in nanoscale assemblies and the subsequent characterization processes presented in this work can be used to address several existing challenges in present photonic and sensor applications. The controlled combination and assembly of noble metal and semiconductor nanostructures realized during the course of this work can serve as future guides and frameworks for further control of light-matter interactions at the nanoscale.