Generation of narrow-band terahertz radiation with preset frequency components in poled ferroelectric materials.

We investigate theoretically the generation of narrow-band, multifrequency terahertz (THz) radiation via optical rectification of femtosecond laser pulses in poled ferroelectric materials. We propose a method based on simulated annealing (SA) algorithm to inversely determine the needed ferroelectric domain structure for generating the expected THz radiation. We demonstrate that multifrequency THz radiation with arbitrarily preset frequencies and relative intensities can be generated from appropriate domain structures determined by this SA-based method. The designed domain structure has a good performance stability with respect to the random fluctuation of the domain thicknesses. [ABSTRACT FROM AUTHOR]