26 January 2018 Intersubband polaritons are robust against inhomogeneous broadening induced by multiple quantum wells
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Abstract
We show that intersubband (ISB) polaritons are robust to inhomogeneous broadening. In a series of multiple quantum well samples with mid-infrared ISB absorption transitions with broadenings varying by a factor of 5 (from 4 meV to 20 meV), we observed polariton linewidths lying in the 4 - 7 meV range only. We have verified the dominantly inhomogeneous origin of the broadening of the ISB transition, and that the linewidth reduction of the modes persists up to room-temperature. The immunity to inhomogeneous broadening is a direct consequence of the coupling of the large number of ISB oscillators to a single photonic mode.
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J-M. Manceau, J-M. Manceau, G. Biasiol, G. Biasiol, N. L. Tran, N. L. Tran, I. Carusotto, I. Carusotto, R. Colombelli, R. Colombelli, } "Intersubband polaritons are robust against inhomogeneous broadening induced by multiple quantum wells", Proc. SPIE 10540, Quantum Sensing and Nano Electronics and Photonics XV, 105400F (26 January 2018); doi: 10.1117/12.2289730; https://doi.org/10.1117/12.2289730
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