Light transfer transition beyond the higher-order exceptional point in (anti-) PT symmetric waveguide arrays

  title={Light transfer transition beyond the higher-order exceptional point in (anti-) PT symmetric waveguide arrays},
  author={Chuanxun Du and Gang Wang and Yan Zhang and Jin-Hui Wu},
  journal={Optics Express},
We propose two non-Hermitian arrays consisting of N = 2 l +1 waveguides and exhibiting parity-time ( PT ) or anti- PT symmetry for investigating light transfer dynamics based on N th-order exceptional points (EPs). The PT -symmetric array supports two N th-order EPs separating an unbroken and a broken phase with real and imaginary eignvalues, respectively. Light transfer dynamics in this array exhibits radically different behaviors, i.e. a unidirectional oscillation behavior in the unbroken… 

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