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O: Fachverband Oberflächenphysik

O 80: Plasmonics and Nanooptics IV: Light-Matter Interaction and Spectroscopy III

O 80.4: Vortrag

Donnerstag, 30. März 2023, 16:00–16:15, CHE 89

Direct imaging of photonic band-edge states in golden-angle Vogel spirals using photoemission electron microscopy — Martin Aeschlimann¹, Felix Fenner², Tobias Brixner³, Benjamin Frisch¹, Patrick Folge⁴, Michael Hartelt¹, •Matthias Hensen³, Thomas H. Loeber⁵, Walter Pfeiffer², Sebastian Pres³, and Bernd Stannowski⁶ — ¹Fachbereich Physik and Research Center OPTIMAS, TU Kaiserslautern, 67663 Kaiserslautern, Germany — ²Fakultät für Physik, Universität Bielefeld, 33615 Bielefeld, Germany — ³Institut für Physikalische und Theoretische Chemie, Universität Würzburg, 97074 Würzburg, Germany — ⁴Angewandte Physik, Universität Paderborn, 33098 Paderborn, Germany — ⁵Nano-Structuring-Center, 67663 Kaiserslautern, Germany — ⁶5PVcomB, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, 12489 Berlin, Germany

Golden-angle Vogel spirals, as deterministic aperiodic structures, support isotropic photonic band gaps and have interesting applications. Especially localized modes, such as band-edge states, are essential for tailored light--matter interaction. Here we report imaging of such modes using photoemission electron microscopy (PEEM). Tunable ultrashort light pulses excite them in golden-angle Vogel spirals that were fabricated by focused-ion-beam (FIB) milling of an a-Si:H layer. The local near-field leads to electron emission which is detected spatially resolved. The demonstration of FIB-textured a-Si:H as photonic material and the ability of PEEM mode imaging offers means to spatiotemporally resolve mode dynamics and to perform nanospectroscopy.