飞秒激光诱导氧化锌晶体表面纳米条纹的相干连接

介绍了飞秒激光脉冲辐照氧化锌晶体表面诱导纳米条纹的相干连接,通过调整两次激光扫描区域的间距,两次独立形成的纳米条纹可以相干的连接起来,形成更长的纳米光栅.这样就解决了以前诱导光栅尺寸由激光聚集光斑大小限制的问题.Raman线扫描技术表征了相干连接的质量,并对相关的物理机制做了讨论.这种技术可以利用飞秒激光制作大尺寸的自组装纳米光栅.

Coherent Linking of Periodic Nano-ripples on a ZnO Crystal Surface Induced by Femtosecond Laser Pulses

We demonstrate the coherent linking of periodic nano-ripples formed on the surface of ZnO crystals induced by femtosecond laser pulses. By adjusting the distance between two laser scanning zones, the periodic nano-ripples induced by two separated laser writing processes can be coherently linked and the ZnO nanograting with much longer grooves is therefore produced. The length limitation of this kind of nanograting previously set by the laser focus size is thus overcome. The micro-Raman mapping technique is used to evaluate the quality of coherent linking, and the underlying physics is discussed. The demonstrated scheme is promising for producing large-size self-organized nanogratings induced by femtosecond laser pulses.