Applications in the field of nanophotonics commonly rely on coherent manipulation of propagating and localized surface plasmons polaritons (SPPs) supported by structured metallic interfaces and tight junctions. Knowledge of the resonances and spatio-temporal characteristics of SPPs that enable single molecule spectroscopy through surface and tip-enhanced Raman (SERS and TERS) are then critical for advancing this field, and for expanding our understanding of molecule-plasmon interactions. This characterization of travelling SPPs is arguably best carried out through time-resolved photoelectron emission microscopy (tr-PEEM), whereby plasmons may be imaged in real space and time with interferometric precision. When time-integrated, PEEM may be utilized to image and quantify local electric fields in plasmonic architectures that are commonly employed in SERS. Complementary information regarding the resonances that govern SERS enhancement and localization may be gleaned through optical spectroscopy of the plasmons themselves, which we explore through polarization resolved hyperspectral SERS and dark-field microscopy. Characteristic plasmons, both localized and traveling, are among that which will be presented, mainly from a chemist’s perspective.

Multimodal characterization of localized and propagating plasmons in real space, time, and frequency

2019 Fall National Meeting

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