1. POLIMA─Center for Polariton-driven Light−Matter Interactions, University of Southern Denmark, Campusvej 55, DK-5230 Odense M, Denmark
2. D-IAS─Danish Institute for Advanced Study, University of Southern Denmark, Campusvej 55, DK-5230 Odense M, Denmark
3. Centro de Física (CF-UM-UP) and Departamento de Física, Universidade do Minho, P-4710-057 Braga, Portugal
4. International Iberian Nanotechnology Laboratory (INL), Av Mestre José Veiga, 4715-330 Braga, Portugal