Surface emitting thermally assisted polaritonic light-emitting device

摘要

We report a mid-infrared surface-emitting electroluminescent device operating in the strong coupling regime between light and matter. The structure is semiconductor based and can operate in absorption or-upon current injection-in emission. The observed minimum Rabi splitting at room-temperature is of the order of 15% of the bare transition. The polaritonic electroluminescence matches the polaritonic branches as measured in absorption and it tunes in frequency with the emission angle, covering a wide spectral range from 900 cm~(-1) to 1300 cm~(-1). The emitted light is mostly transverse-magnetic polarized, but its intensity increases with increasing temperature. This finding suggests a thermally assisted emission process. A simple model that takes into account both the contributions reproduces the data fairly well. This grating-based, surface-emitting resonator architecture suits the future study and development of electroluminescent intersubband devices operating in the strong-coupling regime between light and matter.