Figure 4
From: Bending light via adiabatic optical transition in longitudinally modulated photonic lattices
Snake-like light propagation in longitudinally modulated photonic lattices with adiabatically varying longitudinal modulation period T.
(a) is the trace achieved by alternatively repeating the adiabatic FB mode evolution and optical transition from band 1 to band 3 and its reverse process shown in Fig. 3(a). (b) is the case by cascading adiabatic FB mode evolution and optical transition via a scheme band 1 → band 3 → band 1 → band 2 → band 1. The red arrow indicates the incident beam at λ = 0.6328 μm with a transverse wave vector kx = 0.7π/D. The other lattice parameters are D = 10 μm, δn = 5 × 10−4 and n0 = 2.3, respectively.
