[7a-A410-1~10] 3.11 Photonic structures and phenomena

[7a-A410-1] [JSAP Young Scientist Award Speech] Photonic Topological Insulating Phase Induced by Gain and Loss

〇Kenta Takata^1,2, Masaya Notomi^1,2,3 (1.NTT NPC, 2.NTT BRL, 3.Tokyo Inst. Tech.)

Keywords:topological photonics, non-Hermitian systems, coupled resonators

We reported that a non-Hermitian topological insulating phase could be achieved only by gain and loss control in an originally gapless coupled resonator system. Here, we present theoretically the topological number of the considered system, its topological transition induced solely by gain and loss, and a topological interface state at the boundary between our controlled topologically nontrivial and trivial lattices.