Beer, SebastianSebastianBeerGour, JeetendraJeetendraGourPaul, PallabiPallabiPaulAlberucci, AlessandroAlessandroAlberucciSzeghalmi, AdrianaAdrianaSzeghalmiSiefke, ThomasThomasSiefkePeschel, UlfUlfPeschelZeitner, Uwe DetlefUwe DetlefZeitnerNolte, StefanStefanNolte2025-09-302025-09-302025https://publica.fraunhofer.de/handle/publica/49643810.1109/CLEO/EUROPE-EQEC65582.2025.111110272-s2.0-105016150367Plasmonic nano-antennas featuring dielectric nano-gaps confines the electromagnetic field to sub-wavelength volumes, enabling strong field enhancements and thus boosting nonlinear optical effects. Quantum effects, manifesting as a nonlocal macroscopic response, also play an important role in gaps of few nm [1]. The nonlinear signal can be strongly enhanced by arranging identical nano-antennas in an array, leading to the appearance of collective resonances (in our case guided lattice resonances due to their placement on a membrane) where surface waves lock the phase of all the antennas via radiative coupling [2].enfalseconference paper