Femtosecond Laser-Induced Emission of Coherent Terahertz Pulses from Ruthenium Thin Films.

ABSTRACT: We demonstrate emission of electromagnetic pulses with frequencies in the terahertz (THz) range from ruthenium thin films through a second-order nonlinear optical process. Ruthenium deposited on different substrates showed different THz emission properties. We provide evidence that for Ru on glass above a certain power threshold, laser-induced oxidation occurs, resulting in an increased slope of the linear dependence of the THz electric field amplitude on pump power. The THz electric field is mainly polarized parallel to the sample surface, pointing in the same direction everywhere. In contrast to Ru on glass, the electric field amplitude of the THz pulses emitted by Ru on sapphire and on CaF₂ shows a simple single linear dependence on pump power, and it is polarized orthogonal

SUBMITTER: Cruciani L 

PROVIDER: S-EPMC10683066 | biostudies-literature | 2023 Nov

REPOSITORIES: biostudies-literature