Modulation instability of terahertz pulses in the structures with n-InSb layers

The nonlinear interaction of transversely limited terahertz waves with layered structures that include n-InSb layers and dielectric ones is investigated theoretically. The nonlinearity possesses the focusing character both in longitudinal and transverse directions. The modulation instability of long terahertz pulses is investigated that leads to the generation of sequences of short pulses of picosecond durations at the output.