2017/11/27 by J-M. Manceau, Jean‐Michel Manceau, G. Biasiol +5 · 23 citations
Computer Science · Engineering · Physics and Astronomy · #Absorption (acoustics) #Condensed matter physics #Laser #Laser linewidth #Mesoscopic physics #Optics #Optoelectronics #Photonic and Optical Devices #Photonics #Physics #Plasmon #Polariton #Quantum Information and Cryptography #Strong Light-Matter Interactions #cond-mat.other
paper · pdf · doi:10.1103/physrevb.96.235301
published in Physical review. B./Physical review. B 96(23) (American Physical Society)
arxiv created 2017/11/27 · openalex publication_date 2017/12/01 · arxiv updated 2018/01/03 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We demonstrate that intersubband (ISB) polaritons are robust to inhomogeneous effects originating from the presence of multiple quantum wells (MQWs). In a series of samples that exhibit mid-infrared ISB absorption transitions with broadenings varying by a factor of 5 (from 4 to 20 meV), we observed polariton linewidths always lying in the 4 to 7 meV range only. We experimentally verified the dominantly inhomogeneous origin of the broadening of the ISB transition, and that the linewidth reduction effect of the polariton modes persists up to room-temperature. This immunity to inhomogeneous broadening is a direct consequence of the coupling of the large number of ISB oscillators to a single photonic mode. It is a precious tool to gauge the natural linewidth of the ISB plasmon that is otherwise masked in such MQWs system, and is also beneficial in view of perspective applications such as intersubband polariton lasers.