TERAHERTZ RADIATION EMISSION
MECHANISM FROM FERROMAGNETIC METAL FILMS EXCITED BY FEMTOSECOND LASER PULSES
Anatoly D. Gladun,
Vladimir G. Leiman, Aleksey
V. Arsenin
Moscow Institute of Physics and Technology (State University)
Received
June 4, 2012
Abstract. A coherent terahertz needle radiation emission mechanism is
proposed. This mechanism can be realized in the experiments on femtosecond
laser pulses interacting with surface of nanostructured ferromagnetic metal
film. The proposed mechanism is based on exciting of coupled coherent
phonon-magnon modes on a nanostructured metal surface by laser femtosecond
pulse. The value of the Poynting vector for the terahertz radiation is
estimated.
Keywords: terahertz radiation, nanostructured ferromagnetic metal film,
femtosecond laser, phonon-magnon modes.