Active and Passive Tuning of Ultranarrow Resonances in Polaritonic Nanoantennas

Jiahua Duan^*, Francisco Javier Alfaro-Mozaz, Javier Taboada-Gutiérrez, Irene Dolado, Gonzalo Álvarez-Pérez, Elena Titova, Andrei Bylinkin, Ana Isabel F. Tresguerres-Mata, Javier Martín-Sánchez, Song Liu, James H. Edgar, Denis A. Bandurin, Pablo Jarillo-Herrero, Rainer Hillenbrand, Alexey Y. Nikitin^*, Pablo Alonso-González^*