Publication date: 15th May 2025
Tin-doped indium oxide (ITO) nanocrystals (NCs) strongly absorb infrared (IR) light via localized surface plasmon resonance (LSPR), with tunable properties that depend on their size and doping concentrations. In monolayer assemblies of ITO NCs, we have observed that optical absorption and reflectance properties depend on the NC LSPR but also on coupling between the NCs giving rise to collective plasmon resonance (CPR). The optical spectra can be controlled by adjusting the mixing ratios of ITO NCs with different doping concentrations in hierarchically doped NC superlattices. In this study, we present a comprehensive analysis of the evolution of CPR characteristics, mapping their emergence using local optical and electron energy loss spectroscopies. We analyze the spatial variance of the local spectra, and the strength and spatial extent of CPR domains, bridging the gap between near-field and far-field properties.
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