Extremely high field single-cycle terahertz pulse sources based on echelon structures

Three different echelon based structures for the generation of intense THz pulses were suggested and simulated. Their advantages are the energy scalability and the symmetric THz beam profile. Focused single cycle THz pulses up to ~50 MV/cm peak electric field level are predicted with these sources. Such sources can basically promote the realization of THz driven electron and proton accelerators.