Higher-order dynamic localization in sinusoidal modulated optical lattices with PT-symmetry

The influence of complex lattices with PT -symmetry on dynamic localization (DL) in optics, particularly higher-order DL, has been examined in this study. We found an intriguing result: the order of DL is equal to the frequency of light passing through the first Brillouin zone's boundary during a half-period of DL oscillation. Additionally, the DL is still possible below the PT-symmetry breaking point, but beam power evolution differs from Bloch oscillation in PT-symmetry systems. Similar to damped vibration, the amplitude of beam power oscillation diminishes as propagation distance increases. The nonreciprocal beam propagation behavior is also found at the PT -symmetry breaking point, which is comparable to the optical Bloch oscillation in the PT -symmetry system. (C) 2022 Elsevier B.V. All rights reserved.

Automated summary

This study examines the influence of complex lattices with PT-symmetry on dynamic localization (DL) in optics, particularly higher-order DL. The intriguing finding is that the order of DL is equal to the frequency of light passing through the first Brillouin zone's boundary during a half-period of DL oscillation. DL is still possible below the PT-symmetry breaking point, but the beam power evolution differs from Bloch oscillation in PT-symmetry systems. Nonreciprocal beam propagation behavior is observed at the PT-symmetry breaking point, similar to optical Bloch oscillation in PT-symmetry systems.