Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 69: Plasmonics and Nanooptics VI: Light-Matter Interactions and Characterisation

O 69.8: Vortrag

Mittwoch, 22. März 2017, 12:15–12:30, TRE Ma

Multimodal Tip-Enhanced Microscopy — Kai Braun, •Otto Hauler, Dai Zhang, and Alfred J. Meixner — Institut für Physikalische und Theoretische Chemie, Auf der Morgenstelle 18, 72076 Tübingen

Electromagnetic coupling between plasmonic resonances of two closely spaced metal particles can lead to a strongly enhanced optical near field in the gap between. It is the leading amplification mechanism for surface- and tip-enhanced Raman scattering (SERS/TERS) or enhanced molecular luminescence and has widespread applications in nanoplasmonics. Collecting correlated signals of photoluminescence (PL) and Raman as well as topography, tip-enhanced hyperspectral imaging is able to provide a thorough map of the chemical and morphology-related optical properties in multi-component material systems. Introducing new microscope functions offer us insights into various aspects, such as morphology related photophysical and photochemical processes. Despite its attractive capabilities, developing a tip-enhanced near-field microscope providing reliable and reproducible performance is demanding. In the last years great efforts have been made in our lab to develop stable, reproducible and reliable near-field optical microscopes, which largely meet the above requirements. They successfully demonstrated their capability in high-resolution optical imaging and spectral mapping, or using the tip as local probe for enhanced coupled fields. Furthermore we demonstrate the direct manipulation and measurement of surface properties via electrical charging or injection of charge carriers