[16a-2A-1~13] 3.11 Photonic structures and phenomena

[16a-2A-4] Control of group velocity with PT-symmetric coupled-resonator optical waveguide

〇Kenta Takata^1,2, Masaya Notomi^1,2 (1.NTT BRL, 2.NTT NPC)

Keywords:coupled-resonator optical waveguide (CROW),parity-time symmetry,slow light

It is a challenge to realize active control of the optical group velocity in a coupled-resonator optical waveguide (CROW). Here, we present a theoretical study on a CROW with parity-time (PT) symmetry, which periodically contains balanced gain and loss media in its cavities. An analysis with a tight-binding model shows that switching from an empty CROW to a PT-symmetric CROW can increase the group velocity of the frequency mode nearest to the PT phase transition point more than tenfold.