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Pyramid diffraction in parity-time-symmetric optical lattices (1303.5028v1)
Published 20 Mar 2013 in physics.optics and nlin.PS
Abstract: Nonlinear dynamics of wave packets in two-dimensional parity-time-symmetric optical lattices near the phase-transition point are analytically studied. A novel fourth-order equation is derived for the envelope of these wave packets. A pyramid diffraction pattern is demonstrated in both the linear and nonlinear regimes. Blow-up is also possible in the nonlinear regime for both focusing and defocusing nonlinearities.