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A research team from Xi’an Jiaotong University has demonstrated weakly nonlinear waveguides that guarantee the stable propagation of vortex beams known as azimuthons. The research may have applications in encoding and encrypting optical information. Azimuthons carry an orbital angular momentum and can now be made to exhibit a mutual conversion pattern known as Rabi oscillation — a periodic motion between two different energy levels in the presence of an oscillatory driving field.
The team determined specific requirements for a weak nonlinearity: first, that both the linear and nonlinear induced index changes are small compared to the ambient refractive index, and second, that the induced nonlinear index change is much…READ MORE