[14p-K505-1~14] 3.10 Photonic structures and phenomena

3:30 PM - 3:45 PM JST(6:30 AM - 6:45 AM UTC)

[14p-K505-8] Splitting of an exceptional point into nonlinear bifurcation points in anti-parity-time symmetric coupled cavities

〇Takahiro Uemura^1,2, Kenta Takata^2,3, Masaya Notomi^1,2,3 (1.Science Tokyo, 2.NTT BRL, 3.NTT NPC)

Keywords:

photonic crystal,non-Hermitian optics,Exceptional point

Exception points (EPs), which are singularities that appear in non-Hermitian systems with PT or anti-PT symmetry, are defined in linear systems, but gain saturation appears as a nonlinear term in systems with real gains. Recently, the similarity between EP and nonlinear bifurcation points in linear systems has been pointed out. In this study, we analyze a theoretical model of a dissipative coupled resonator system with gain saturation. We show that under anti-PT symmetry, the EP splits into two nonlinear bifurcation points above the oscillation threshold while retaining its properties.