K. Staliūnas, C. Cojocaru, J. Trull, R. Herrero, Y. Loiko
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Second harmonic generation of narrow beams in subdiffractive photonic crystals
We predict, that extremely narrow beams (of the width of few wavelengths) can be used for an efficient second harmonic generation in quadratic-nonlinear photonic crystals, tuned to the subdiffractive (self-collimating) regime simultaneously for the both, fundamental and the second harmonics, waves. We prove the idea analytically, by harmonic expansion technique, and numerically, by finite difference time domain (FDTD) integration.
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