Groupe de Physique des Materiaux UMR CNRS 6634, UFR Sciences Site du Madrillet, Avenue de l'Université - B.P. 12 76801 Saint Etienne du Rouvray Cedex, France.
Ultramicroscopy. 2013 Sep;132:5-18. doi: 10.1016/j.ultramic.2013.05.016. Epub 2013 Jun 11.
The evaporation mechanisms of surface atoms in laser assisted atom probe tomography (LA-APT) are reviewed with an emphasis on the changes in laser-matter interaction when the sample is a nanometric tip submitted to a high electric field. The nanometric dimensions induce light diffraction, the tip shape induces field enhancement and these effects together completely change the absorption properties of the sample from those of macroscopic bulk materials. Moreover, the high electric field applied to the sample during LA-APT analysis strongly modifies the surface optical properties of band gap materials, due to the band bending induced at the surface. All these effects are presented and studied in order to determine the physical mechanisms of atoms evaporation in LA-APT. Moreover, LA-APT is used as an original experimental setup to study: (a) the absorption of nanometric tips; (b) the contribution of the standing field to this laser energy absorption and (c) the heating and cooling process of nanometric sample after the interaction with ultra fast laser.
激光辅助原子探针层析技术（LA-APT）中表面原子的蒸发机制被综述，重点在于当样品为纳米针尖并承受高电场时激光与物质相互作用的变化。纳米尺寸诱导光衍射，针尖形状诱导场增强，这些效应共同彻底改变了样品的吸收性质，使其与宏观体材料不同。此外，在 LA-APT 分析过程中施加于样品的高电场强烈地改变了带隙材料的表面光学性质，这是由于表面诱导的能带弯曲所致。所有这些效应都被呈现和研究，以确定 LA-APT 中原子蒸发的物理机制。此外，LA-APT 被用作原始的实验装置来研究：（a）纳米针尖的吸收；（b）驻波场对这种激光能量吸收的贡献；以及（c）与超快激光相互作用后纳米样品的加热和冷却过程。
