Generation of difference terahertz-frequency signals in a system of compound one-dimensional photonic crystals

The possibility of amplification of difference terahertz-frequency signals generated in one-dimensional nonlinear crystals is studied theoretically. It is shown that the intensity of nonlinear terahertz signals can be considerably increased both due to the coherent summation of waves generated in several photonic crystals and the choice of a special configuration of photonic crystals representing a two-periodic structure.