Theory of Ultrafast Demagnetization after Femtosecond Laser Pulses

Laser-induced ultrafast demagnetization in ferromagnetic metals.

The laser-induced femtosecond demagnetization in ferromagnetic metals is investigated theoretically. Different from the conventional nanosecond one, this ultrafast demagnetization is a cooperative effect of the external laser field and the internal spin-orbit coupling. The spin-orbit coupling smears out the original identities of triplets and singlets while the laser field uses it as an avenue ...

Nanorod Surface Plasmon Enhancement of Laser-Induced Ultrafast Demagnetization

Ultrafast laser-induced magnetization dynamics in ferromagnetic thin films were measured using a femtosecond Ti:sapphire laser in a pump-probe magneto-optic Kerr effect setup. The effect of plasmon resonance on the transient magnetization was investigated by drop-coating the ferromagnetic films with dimensionally-tuned gold nanorods supporting longitudinal surface plasmon resonance near the cen...

Control of ultrafast electron dynamics with shaped femtosecond laser pulses: from atoms to solids

Distortion of femtosecond laser pulses in lenses.

Large temporal front distortion of femtosecond pulses occurs in lenses having chromatic aberration. The effect is due to the difference between the phase and group velocities. Equations describing the pulse-front delay in singlet lenses, achromats, and compound lenses are presented. The pulse-front delay is several orders of magnitude larger than the broadening caused by group-velocity dispersi...

Synthesis of nanoparticles with femtosecond laser pulses

S. Eliezer,* N. Eliaz, E. Grossman, D. Fisher, I. Gouzman, Z. Henis, S. Pecker, Y. Horovitz, M. Fraenkel, S. Maman, and Y. Lereah Plasma Physics Department, Soreq NRC, Yavne 81800, Israel Department of Solid Mechanics, Materials and Systems, Tel Aviv University, Ramat Aviv, Tel Aviv 69978, Israel Space Environment Division, Soreq NRC, Yavne 81800, Israel Faculty of Physics, Weizmann Institute o...