Title :
Broadband terahertz wave emission from thin metal films excited by two-color laser fields
Author :
Jianming Dai ; Zhang, X.-C.
Author_Institution :
Inst. of Opt., Univ. of Rochester, Rochester, NY, USA
Abstract :
We demonstrated broadband terahertz (THz) wave emission from thin metal (gold) films excited by two-color laser fields synthesized by an in-line phase compensator. By driving the electrons in thin metal films asymmetrically, THz wave emission is observed at normal incidence of the two-color pump beams in a transmission geometry. Similar to the air-plasma THz source excited by two-color laser fields, the generation process can be phenomenologically attributed to the 3rd-order nonlinear (four-wave mixing) process.
Keywords :
gold; laser beam effects; metallic thin films; multiwave mixing; optical films; optical pumping; terahertz wave spectra; 3rd-order nonlinear process; Au; THz wave emission; air-plasma THz source; broadband terahertz wave emission; electrons; four-wave mixing; generation process; in-line phase compensator; normal incidence; thin metal films; transmission geometry; two-color laser fields; two-color pump beams; Crystals; Films; Gold; Laser beams; Laser excitation; Surface emitting lasers;
Conference_Titel :
Infrared, Millimeter, and Terahertz waves (IRMMW-THz), 2014 39th International Conference on
Conference_Location :
Tucson, AZ
DOI :
10.1109/IRMMW-THz.2014.6955995
