Fig. 1From: Full-Spectrum Analysis of Perovskite-Based Surface Plasmon NanolasersPlasmonic perovskite nanocavity. a Schematic diagram of proposed plasmonic nanocavity. A perovskite nanowire is placed on a SiO2-covered metallic substrate. Two end facets of the nanowire with a length of several micrometers, which function as reflectors, form naturally a plasmonic cavity. The inset is an optical microscopy picture of a MAPbBr3 NW on a SiO2-covered Ag substrate. b–d Modal profiles (in transverse view) of electric field component |E| of the cavity resonance mode calculated by 3D finite element method. The strongly confined modal profile of plasmonic gap mode is shown in (b). The resonance pattern shown in (d) depicts the features of the hybrid plasmonic mode originated from the coupling of NW photonic mode and propagating surface plasmon wave. In addition to an obvious standing-wave pattern along the long axis (z-direction) as shown in (c), lateral confinement of the mode (x-direction) is sufficiently strongBack to article page