Triple sum-frequency (TSF) spectroscopy is a recently developed methodology that enables collection of multidimensional spectra by resonantly exciting multiple quantum coherences of vibrational and electronic states. This poster will discuss the development of TSF for investigating semiconducting transition metal dichalcogenide nanostructures which possess both unique quantum physics and mechanical properties. The strengths of TSF compared to traditional techniques will be discussed. For instance, TSF can differentiate between optical transitions with large dipoles and those with large state densities; this differentiation allows for more accurate assignments of transitions compared to a conventional absorption measurement. Moreover, when TSF is used to investigate photoexcited systems, it can monitor ultrafast electron dynamics in nanostructures with higher signal-to-noise than conventional ultrafast measurements. This poster will also discuss our research into the ability of a strong, non-resonant pump pulse to drastically modify the optical harmonic generation efficiency of transition metal dichalcogenides, which hints at their ability to be used as all-optical nonlinear switches.

Development of sum-frequency and transient sum-frequency spectroscopies to study transition metal dichalcogenide nanostructures

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.