[10a-N405-1~9] CS.6 Code-sharing Session of 3.13 & 4.2

▲ [10a-N405-4] Third-order Exceptional Point and State-switching in an All-lossy Microcavity

〇(DC)Arnab Laha¹, Dinesh Beniwal², Somnath Ghosh¹ (1.IIT Jodhpur, 2.NISER Bhubaneswar)

Keywords:Optical Microcavities, Exceptional Points, State-switching

The interplay of gain-loss with the topology of an open optical system entitles the presence of exceptional points (EPs), a special type of topological defect in the parameter space, for which the corresponding coupled eigenvalues and the eigenvectors coalesce, simultaneously. Lately, the effect of closed gain-loss variation around an EP2 has extensively been investigated to explore various applications associated with the topological state-transfer process. However, the presence of gain beyond a particular threshold can accumulate excessive noise and additional gain-guided states, which can prevent the desired device performance. Such limitations can be overcome by designing an all-lossy system (gain-free). In this context, although an all-lossy waveguide system revealed the hallmark of 2^nd-order EPs (EP2s), the findings to explore the higher-order EPs in all-lossy systems are lacking. Here, we report the hosting of a 3^rd-order EP (EP3) with the simultaneous presence of two connected EP2s in an all-lossy microcavity and explore the associated topological state-switching applications.