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O: Fachverband Oberflächenphysik
O 52: Oxide and insulator surfaces: Structure, epitaxy and growth I
O 52.3: Vortrag
Dienstag, 10. März 2026, 15:15–15:30, WILL/A317
Ultra-high THz-confinement in LaAlO3 twin-walls — •Jakob Wetzel1, Javier Taboada-Gutiérrez2, Susanne C. Kehr1, Alexey B. Kuzmenko1,3, Lukas M. Eng2, and Samuel D. Seddon1 — 1TU Dresden, Institute of Applied Physics, Nöthnitzer Straße 61, 01187 Dresden, Germany — 2University of Geneva, Department of Quantum Matter Physics (DQMP), Geneva 1211, Switzerland — 3ct.qmat: Dresden-Würzburg Cluster of Excellence EXC 2147, TU Dresden, 01062 Dresden, Germany
Recent advancements in polaritonics and nano-photonics have focused on the confinement of optical modes in ultra-thin films, 2D materials, and interfaces in order to uncover pathways toward ultra-compact nanophotonic circuits and sub-diffraction imaging technologies. Such approaches to THz-confinement face fundamental challenges such as inherent strain, defects, and lattice mismatches.
Here we present the experiment- and simulation-based investigations of ferroelastic twin-walls in LaAlO3, which provide a *perfect* strain-free interface to explore optical effects emergent from the coincidence of two equal but directionally rotated optical axes. Scanning near-field optical microscopy (s-SNOM) in combination with the HZDR free electron laser FELBE shows an ultra-high confinement (>250) of THz-fields at these twin-wall. Experimental results are reproduced by COMSOL-simulations and understood with an adapted dipole model.
Keywords: THz; SNOM; Twin-walls; LaAlO3