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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 28: Poster III
CPP 28.49: Poster
Wednesday, March 20, 2024, 11:30–13:30, Poster C
Photo-thermal Expansion of Nanostructured Surfaces in Photoinduced Force Microscopy (PiFM) — •Shohely Anindo1,2, Jesvin Joseph2,3, Rainer Heintzmann2,3,4, Daniela Täuber3,4, and Christin David1,2 — 1IFTO, Friedrich Schiller University Jena — 2Abbe Center of Photonics, Jena — 3Leibniz Institute of Photonic Technology, Jena — 4Institute of Chemical Physics, Friedrich Schiller University Jena, Germany
The recently developed Photo-induced Force Microscopy (PiFM) offers high spatial resolution in chemical imaging of polymer films and biomaterials, when combined with mid-infrared illumination. Upon absorption, photo-thermal expansion of the material causes a modulation of the Van der Waals (vdW) force acting between the tip and the sample. This work theoretically investigates the non-linear impact of material properties and surface shape on the tip-sample interaction, heat generation from the presence of a photo-induced electric field, the resulting thermal expansion under different illumination conditions and the change in cantilever oscillation at different detection modes. We compare our results to mid-infrared PiFM images obtained from a poly(methyl methacrylate) (PMMA) nanosphere with a diameter of 100 nm.
Keywords: plasmonics; thermal expansion; Van der Waals interaction; PMMA nanosphere; force microscopy