Proceedings of nanoGe September Meeting 2015 (NFM15)
Publication date: 8th June 2015
Wide bandgap semiconductors such as metal oxides can be rendered plasmonic by doping to introduce exogenous free carriers. In the past few years, a number of doped metal oxides (i.e., transparent conducting oxides) have been prepared as colloidal nanocrystals. These nanocrystals have synthetically tunable doping levels, shapes, and sizes, giving rise to a broad range of localized surface plasmon resonance (LSPR) phenomena. Charging and discharging these nanocrystals strongly modulates their LSPR, which has enabled our development of visible- and near infrared-light modulating electrochromic devices suitable for smart windows. Many other applications of LSPR phenomena depend on the plasmon linewidth or the enhancement of electric field around the photoexcited nanocrystal, both of which are related to damping of the plasmonic oscillation. The intrinsic damping characteristics of metal oxide nanocrystals have so far been hidden beneath unknown heterogeneous broadening of their spectra, limiting our ability to predict their potential as sensors, optical antennae, and so on. Recently, we have used single nanocrystal spectroscopy and simulations to uncover the contributions of heterogeneity to optical properties of nanocrystal ensembles and to predict the near field properties of plasmonic oxide nanocrystals. Individual nanocrystals can have LSPR linewidths less than one half that of the ensemble and narrower than those of noble metal nanoparticles. These results suggest long dephasing times and high field enhancements are achievable under infrared excitation of metal oxide nanocrystal LSPRs.
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