Periodic surface structures on Ni–Fe film induced by a single femtosecond laser pulse with diffraction rings  

作　　者：周侃 贾鑫 郗慧霞 刘聚坤 冯东海 张诗按 孙真荣 贾天卿 

机构地区：[1]State Key Laboratory of Precision Spectroscopy, East China Normal University [2]Department of Mathematics and Physics, Shanghai Dianji University

出　　处：《Chinese Optics Letters》2017年第2期63-67,共5页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos. 11474097, 11274116, 11104178, 44108280, and 51132004);the National Special Science Research Program of China (No. 2011CB808105)

摘　　要：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.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.

关 键 词：DIFFRACTION Electromagnetic wave polarization Iron Laser ablation Laser optics Laser pulses Metallic films Nickel Particle optics Periodic structures PHONONS PHOTONS PLASMONS Quantum theory Surface plasmon resonance Surface structure Ultrafast lasers 

分 类 号：TN249[电子电信—物理电子学] TB383.2[一般工业技术—材料科学与工程]