[20p-A101-1~16] 3.10 Photonic structures and phenomena (formerly 3.11)

[20p-A101-2] Experimental observation of exceptional points in graphene-loaded non-Hermitian photonic crystals

〇(M1)Satoshi Suzuki^1,2, Shutaro Otsuka^1,2, Takahiro Uemura^1,2, Taiki Yoda^2,3, Yuto Moritake¹, Masaaki Ono^2,3, Eiichi Kuramochi^2,3, Masaya Notomi^1,2,3 (1.Tokyo Tech, 2.NTT BRL, 3.NTT NPC)

Keywords:photonic crystal, non-Hermitian, exceptional point

In this study, we have observed the exceptional point (EP) by band measurements in a graphene-loaded non-Hermite photonic crystal reported previously.
As a result, we succeeded in observing the expected asymmetric circular polarization conversion at the EP and found that the EP is formed at the Γ point.
We also find that the behavior of the EP in wavenumber space in this system is well explained by a model with an effective Hamiltonian.