Nature Communications (Dec 2016)
Direct observation of exceptional points in coupled photonic-crystal lasers with asymmetric optical gains
Abstract
Non-Hermitian optical systems have been shown to sustain lasing when they go from a PT-symmetric to a PT-symmetry-broken phase. Here, Kimet al. study this phase transition of lasing modes in partially graphene-covered coupled microcavities and show tuning of an exceptional point.