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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 17: Poster I

CPP 17.44: Poster

Montag, 9. März 2026, 19:00–21:00, P5

Real Time Spectroscopy of Plasmonic Core-Shell Microgels during Compression at Air/Water Interfaces — •Matthias Karg and Déborah Feller — Martin Luther University Halle-Wittenberg, Halle, Germany

Plasmon resonance coupling is strongly distance-dependent. In contrast to near-field coupling of plasmonic nanoparticles in close proximity, periodic superstructures support plasmonic-diffractive coupling. The resulting surface lattice resonances are interesting for their narrow linewidth and sensitivity to refractive index environment and lattice periodicity. Typically studied periodic arrays are (solid) substrate-supported and thus structurally fixed unless elastic substrates are used. Seeking an alternative approach, we demonstrate the large dynamic control of periodic plasmonic lattices using soft and deformable core-shell microgels self-assembled at air/water interfaces. Using microgels with gold cores and sufficiently thick microgel shells, we realized periodic monolayers where the periodicity can be controlled by compression using a Langmuir trough. The implementation of an extinction spectrometer setup was used to probe the optical response of the monolayer in situ during continuous reduction of the available area, in real time. We monitor plasmon resonance coupling with a never before reported stepsize in interparticle spacing by following peak position, width and intensity. The observed spectral changes support recent findings that confined microgel monolayers at fluid interfaces show a continuous reduction in spacing when uniaxially compressed opposed to the cluster formation that is observed after drying on solid substrates.

Keywords: Core-Shell Microgels; Colloidal Monolayer; Interface-Assisted Self-Assembly; Plasmon Resonance Coupling; Uniaxial Deformation