Abstract
The modulation instability (MI) of light beam propagation near the supercollimation frequency in nonlinear photonic crystals was investigated. The role of the nonlinear diffraction effect, merged as a result of nonlinear tuning of the equal-frequency contour curvature, in MI is particularly identified. It is found that the nonlinear diffraction effect tends to stimulate or suppress MI depending on the sign of the product of nonlinear diffraction and Kerr effects. Further analysis reveals that the MI and soliton phenomenon may be steered by the tunable supercollimation frequency in nonlinear photonic crystals.
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