[10a-B11-1~12] 3.10 Photonic structures and phenomena

11:45 AM - 12:00 PM JST(2:45 AM - 3:00 AM UTC)

[10a-B11-11] Generation and Observation of Non-Hermitian Point Gap Using Bound States in the Continuum in Photonic Crystal

〇(M1)Yusuke Ohinata^1,2, Yuto Moritake^1,3, Taiki Yoda^1,2, Masaaki Ono^2,4, Eiichi Kuramochi^2,4, Masaya Notomi^1,2,4 (1.Science Tokyo., 2.NTT BRL., 3.The Univ. of Tokyo, 4.NTT NPC.)

Keywords:

photonic crystals,non-Hermitian point gap,bound states in the continuum

Our group has successfully observed a non-Hermitian point gap induced by anisotropic radiative loss in a square-lattice photonic crystal slab with triangular air holes. We have also proposed a method to generate bound states in the continuum (BICs), in which radiative loss is suppressed, by breaking the structural symmetry. Since radiative loss changes rapidly in the vicinity of BICs, anisotropic loss can be effectively introduced. In this presentation, we propose a structure based on BICs to effectively induce anisotropy in radiative loss and report the successful observation of a point gap.