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O: Fachverband Oberflächenphysik

O 80: Scanning Probe Microscopy: Light Matter Interaction at Atomic Scales II

O 80.4: Vortrag

Donnerstag, 21. März 2024, 11:15–11:30, MA 041

Directional emission of plasmonic light by atomic-scale defects — •David Mateos^1,2, Óscar Jover², Miguel Varea^1,2, Koen Lauwaet¹, Daniel Granados¹, Rodolfo Miranda^1,2, Antonio Isaac Fernández Domínguez³, Alberto Martín Jiménez¹, and Roberto Otero^1,2 — ¹IMDEA Nanoscience, Madrid, Spain — ²Departamento de Física de la Materia Condensada and Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, Madrid, Spain — ³Departamento de Física Teórica de la Materia Condensada and Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, Madrid, Spain

Manipulating the directionality of subwavelength light sources is demanded in broad applications, including sensing, photonics, optoelectronics, and energy harvesting. In this respect, nanoscale objects can control the angular distribution of scattered light below the diffraction limit. It has been demonstrated that properly engineering the size, shape, and arrangement of nanostructures in the few-nanometer scale affords control of the emission properties. Still, the effect of atomistic structures remains unexplored. In this work, we show that atomic-scale objects can also modify the directionality of plasmonic emission. The radiative density of optical states of the nanocavity formed by a sharp metallic tip at tunneling distance to a metallic surface is locally modified by a monoatomic height step. Comparison with electromagnetic calculations demonstrates that the observed changes arise from light emission tilting of the picocavity plasmons. Thus, atomic-like structures influence the light emission properties of nanoscale objects.

Keywords: Atomic scale defects; Directionality of light; Picocavities; Photonic density of optical states; Rate of inelastic transitions