Chinese Optics Letters, 2017, 15 (2): 022201, Published Online: Jul. 26, 2018
Periodic surface structures on Ni–Fe film induced by a single femtosecond laser pulse with diffraction rings Download: 783次
Abstract
This Letter reports the formation of periodic surface structures on Ni–Fe film irradiated by a single femtosecond laser pulse. A concave lens with a focus length of 150 mm is placed in front of an objective (100 × , NA = 0.9 ), which transforms the Gaussian laser field into a ring distribution by the Fresnel diffraction. Periodic ripples form on the ablation area after the irradiation of a single femtosecond laser pulse, which depends on the laser polarization and laser fluence. We propose that the ring structure of the laser field leads to a similar transient distribution of the permittivity on the sample surface, which further launches the surface plasmon polaritons. The interaction of the incident laser with surface plasmon polaritons dominates the formation of periodic surface structures.
Kan Zhou, Xin Jia, Huixia Xi, Jukun Liu, Donghai Feng, Shian Zhang, Zhenrong Sun, Tianqing Jia. Periodic surface structures on Ni–Fe film induced by a single femtosecond laser pulse with diffraction rings[J]. Chinese Optics Letters, 2017, 15(2): 022201.