Multiply-resonant second-harmonic generation using surface lattice resonances in aluminum metasurfaces

• DOI: 10.1364/oe.449198
• Publication Date: 2022-01-13T11:00:19Z
• Authors: Timo Stolt; Anna Vesala; Heikki Rekola; Petri Karvinen; Tommi K. Hakala; Mikko J. Huttunen
• Keywords: Lattice (music); Harmonic

Nonlinear metamaterials show potential for realizing flat nonlinear optical devices but are generally lacking in terms of achievable conversion efficiencies. Recent work has focused on enhancing processes by utilizing high quality factor resonances, such as collective responses known surface lattice resonances (SLRs) taking place periodic metal nanoparticle arrays. Here, we investigate how the dispersive nature SLRs affects SLR-supporting metasurfaces. Particularly, measure second-harmonic generation from aluminum arrays and demonstrate that tilting sample along two orthogonal directions, can be made multiply-resonant several pump signal wavelength combinations. Characterized metasurfaces estimated to exhibit a second-order susceptibility value 0.40 pm/V, demonstrating material