Electric-field tunable electroluminescence from intersubband transitions in a quantum well has been demonstrated via the strong coupling of the electronic transitions with an optical cavity mode. The device consists of a quantum cascade structure embedded in a planar metal-dielectric microcavity where electrons can be resonantly injected at different energies, thanks to the polariton dispersion curve. The electroluminescence tuning shows a strong far field angular dependence in accordance with the conservation of the in-plane momentum. Our experiment illustrates that it is possible to connect quantum optics and electronic transport in semiconductor heterostructures.
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