Detailed numerical analysis and computer simulation of a two-dimensional defective photonic crystal structure fabricated with nonlinear optical materials are carried out. The localized states in the band gap and electric field distributions of such a structure were calculated by the finite-difference time-domain method, and demonstrated a greatly enhanced second harmonic generation with an efficiency of about 4 orders of magnitude higher than that in an ordinary nonlinear crystal.
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Shi et al. (2002) studied this question.
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