Weissflog, Maximilian A.Maximilian A.WeissflogDezert, RomainRomainDezertVinel, VincentVincentVinelSaravi, SinaSinaSaraviBorne, AdrienAdrienBornePertsch, ThomasThomasPertschSetzpfandt, FrankFrankSetzpfandtGuiseppe, LeoLeoGuiseppe2023-02-012023-02-012022https://publica.fraunhofer.de/handle/publica/43468510.1364/CLEO_SI.2022.SW4H.32-s2.0-85136785974Subwavelength resonators have recently emerged as promising sources of spontaneous parametric down-conversion. By modeling them with quasi-normal mode expansion, we reveal a nonlinear multimode interaction and assist the design of efficient metasurfaces for quantum technologies.enconference paper