SPICE Workshop on Spin textures: Magnetism meets Plasmonics, July 23rd - 25th 2024
Bettina Frank
During the last few years, topology has been combined with plasmonics by introducing boundary conditions into surface plasmon polariton (SPP) electric- or spin vector fields. In our work, we exploit atomically flat surfaces of single crystalline gold platelets for SPP excitation, propagation, and interference. SPPs are excited on grooves that are milled into the ultra-smooth gold surface by utilizing a focused beam of Au2+-ions. According to the shape of the grooves, SPPs are excited and interfere, respectively, hence they exhibit characteristic topological features in their electromagnetic fields. In this talk, I will elaborate on our sample fabrication as well as on our measurement techniques, which are two-photon photo electron emission microscopy (2PPE PEEM) and scanning near-field optical microscopy (SNOM), and apply them to specific examples in topology.