Bonn 2025 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 49: Poster – Photonics, Lasers, and Applications

Q 49.9: Poster

Wednesday, March 12, 2025, 17:00–19:00, Tent

Exciton-Plasmon Coupling at the Borophene/ZnO Interfaces Unraveled by Cathodoluminescence Spectroscopy — •Bharti Garg¹, Masoud Taleb¹, Yaser Abdi², and Nahid Talebi¹ — ¹Institute for Experimental and Applied Physics, Kiel University, Kiel, Germany — ²Department of Physics, University of Tehran, Tehran, Iran

Borophene, a two-dimensional atomic sheet of boron, exhibits unique anisotropic in-plane polaritons in the visible spectral range [1] . In this work, we leverage advanced deep-subwavelength cathodoluminescence spectroscopy to investigate the coupling of the plasmons of borophene with the excitons of ZnO nanorods at the borophene/ZnO interface. Our results show that the near-band-edge emission (exciton transition) in ZnO nanorods is enhanced at the borophene/ZnO interface attributed to a coupling between ZnO excitons and borophene plasmons. Additionally, an emission around 800 nm is observed in the cathodoluminescence spectrum, corresponding to the plasmon-polariton peak of borophene, with a modified and reduced bandwidth and stronger luminescence peak, that is due to the coherent interactions between excitons and plasmon polaritons. Interestingly, high-resolution cathodoluminescence hyperspectral imaging from different interfaces of borophene/ZnO shows that the cathodoluminescence of the borophene/ZnO interface strongly depends on the crystallographic direction of the borophene attached to ZnO nanorods due to the anisotropic electrical and optical behavior of borophene. [1]arXiv preprint arXiv:2404.13609v

Keywords: ZnO nanorods; borophene; borophene/ ZnO interface; anisotropic; cathodoluminescence spectroscopy