Light emission from plasmonic tunnel junctions coupled to photonic cavities

Photonic cavities and plasmonic tunnel junctions offer interesting pathways for the development of next-generation optoelectronic devices owing to their capability to confine and manipulate light at subwavelength scales. The coupling of the photonic cavity mode and the radiative mode of a plasmonic tunnel junction would mimic a coupled oscillator system capable of generating hybridized modes that facilitate interactions between light and matter. In recent studies, electroluminescence was employed as a tool to probe such phenomena in resonantly interacting systems. I will present our preliminary observations of light-matter coupling in a resonant hybrid system comprising an electroluminescent plasmonic nanojunction in the vicinity of a lithographically structured photonic crystal.  Clear signatures of plasmon/cavity mode coupling are observed in the emission spectrum.  Lineshapes and polarization-dependent spectra will be examined in terms of models of light-matter coupling.