2021/05/20 by Jan Mundry, Florian Spreyer, Mundry, Jan +12
Engineering · Materials Science · Physics and Astronomy · #FOS: Physical sciences #GaN-based semiconductor devices and materials #Materials Science (cond-mat.mtrl-sci) #Metamaterials and Metasurfaces Applications #Optics (physics.optics) #Plasmonic and Surface Plasmon Research #cond-mat.mtrl-sci #physics.optics
paper · pdf · doi:10.48550/arxiv.2105.09726
arxiv created 2021/05/20 · openalex publication_date 2021/05/20 · arxiv updated 2021/05/21 · openalex created_date 2022/07/25 · openalex updated_date 2026/07/28
We realize and investigate a nonlinear metasurface taking advantage of intersubband transitions in ultranarrow GaN/AlN multi-quantum well heterostructures. Owing to huge band offsets, the structures offer resonant transitions in the telecom window around 1.55 μm. These heterostructures are functionalized with an array of plasmonic antennas featuring cross-polarized resonances at these near-infrared wavelengths and their second harmonic. This kind of nonlinear metasurface allows for substantial second-harmonic generation at normal incidence which is completely absent for an antenna array without the multi-quantum well structure underneath. While the second harmonic is originally radiated only into the plane of the quantum wells, a proper geometrical arrangement of the plasmonic elements permits to redirect the second-harmonic light to free-space radiation, which is emitted perpendicular to the surface.