Silicon nitride PhC nanocavities as versatile platform for visible spectral range devices

► We propose Si3N4 photonic crystal as platform for devices in the visible spectral range. ► Si3N4 resonators allow the spontaneous emission engineering of several nanoemitters. ► Visible colloidal nanocrystals positioned in the maximum of the localized electric field. We propose silicon nitride two-dimensional photonic crystal resonators as flexible platform to realize photonic devices based on spontaneous emission engineering of nanoemitters in the visible spectral range. The versatility of our approach is demonstrated by coupling the two dipole-like modes of a closed band gap H1 nanocavity with: (i) DNA strands marked with Cyanine 3 organic dyes, (ii) antibodies bounded to fluorescent proteins and (iii) colloidal semiconductor nanocrystals localized in the maximum of the resonant electric field. The experimental results are in good agreement with the numerical simulations, highlighting the good coupling of the nanocavities with both organic and inorganic light emitters.