单光束飞秒激光诱导微纳周期结构的现象与机理  

Phenomena and mechanisms of single beam femtosecond laser induced periodic microstructures

作　　者：王丽[1] 丁婷[1] 邱建荣[1] 

机构地区：[1]浙江大学材料科学与工程系,杭州310027

出　　处：《物理》2007年第1期63-67,共5页Physics

基　　金：国家重点基础研究发展计划(批准号:2006CB806000b)资助项目

摘　　要：飞秒激光具有超快和超强(聚焦后局域电场达到1010V/cm,相当于氢原子的库仑场强)的特点,因此它与材料发生相互作用时会产生多光子吸收、多光子电离、自聚焦等非线性效应.文章介绍最近发现的单光束飞秒激光在物质内部诱导自组装纳米光栅,沿光束传播方向排列成行的纳米周期孔洞结构以及材料表面诱导纳米周期结构等新现象,并对这些现象的机理作了阐述.A femtosecond laser produces ultrashort pulses and ultrabigh electric fields. Various nonlinear effects, such as multiphoton absorption, multiphoton ionization, self-focusing and so on will occur when this laser radiation interacts with matter. We describe the novel phenomena and mechanisms of single beam femtosccond laser induced polarization-dependent nanogratings, periodic nanovoid structures along the propagation direction of the laser beam, and the alignment of nanoripples formed on the surface of crystals, which were all discovered recently.

关 键 词：光电功能材料 纳米周期结构 飞秒激光 

分 类 号：O437[机械工程—光学工程]