[12p-N321-1~15] 3.11 Photonic structures and phenomena

[12p-N321-4] Non-Hermitian coupled mode theory for cavity arrays with contrast of radiation loss

〇Kenta Takata^1,2, Nathan Roberts², Akihiko Shinya^1,2, Masaya Notomi^1,2,3 (1.NTT Nanophotonics Center, 2.NTT BRL, 3.Tokyo Inst. Tech.)

Keywords:exceptional point, coupled resonators, photonic crystal

We derive a non-Hermitian coupled-mode theory for evanescently coupled cavities with contrast of raditation loss. Here, we reveal finite imaginary parts of inter-cavity couplings, which appear as the change in net radiation loss by the interference of cavity modes. We also design two coupled point-defect photonic crystal nanocavities with an ideal exceptional point, which is induced purely by radiation and fully analyzed by our model.