EN
Terahertz emission from the electron-hole plasma excited by a femtosecond optical pulse in GaAs-based emitters is studied by the Monte Carlo simulations. The THz energy radiated from the n- and p-doped GaAs surface THz emitters, from the contactless p-i-n emitter, and from the photoconductive emitter is evaluated. The obtained results show that the THz energy radiated by the photoconductive emitter exceeds the energy radiated by the surface and p-i-n THz emitters by more than one order of magnitude.