Ultrafast Infrared Spectroscopy at the Nanoscale
- Joint Online Seminar
- Date: Sep 6, 2021
- Time: 10:00 AM (Local Time Germany)
- Speaker: Jun Nishida
- Center for Mesoscopic Sciences, Institute for Molecular Science, Japan
- Host: Fritz Haber Institute

In this talk, I will present recent advances in ultrafast infrared nano-spectroscopy that are now capable of characterizing ultrafast dynamics of functional materials at the nm-fs scale. We apply reflection-enhanced two-dimensional infrared (2D IR) spectroscopy to thin films of room-temperature ionic liquid (RTIL), unraveling an unusually large impact of an interface on the RTIL’s structural dynamics that propagates beyond 30 nm. We also develop highly sensitive ultrafast infrared scattering scanning near-field optical microscopy (IR s-SNOM) with far-from-equilibrium excitation, elucidating spatial heterogeneity in polaron dynamics in lead halide perovskites. These advances in ultrafast infrared nano-imaging and -spectroscopy provide an access to spatially disordered molecular and carrier dynamics, which directly impact device performances from batteries to photovoltaics.
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