Generation of a guided mode in a THz semiconductor waveguide using excitation by a tilted optical pulse front

We employ tilted-pulse-front techniques to control the propagation direction of the THz pulses emitted from photoexcited semiconductors. At a proper tilt angle of the optical pulse front, the generated THz pulse propagates along a waveguide on the semiconductor surface and eventually emits from the end facet of the semiconductor structure. This work aims at an investigation of semiconductor quantum structures with gain excited just in time when the THz pulse to be amplified arrives.