衍射激光驻波场汇聚原子沉积纳米光栅关键技术研究

Direct writing of atom lithography is a new technique in which resonant light is used to manipulate neutral atoms and nanostuctures are formed when the atoms are deposited on substrate. The diffraction effect will occurs when the laser standing wave reacts with substrate, accordingly, this diffraction effect will induce the redistribution of laser standing wave, and seriously affect the depositional characteristics of atoms, so it is very important to analyze the deposition process and characteristics of atoms with diffraction effect. At present, the diffraction effect does not taken into account during the manipulation of atoms with laser standing wave. At the same time, these analysis mainly use one and/or two dimensional models, and be short of three dimensional spatial motion and distribution information in the real condition. Based on these instances, three dimensional model of straight edge diffraction will be established by using four order Runge-Kutta arithmetic. Through three dimensional simulation on the interaction between diffraction laser standng wave and neutral atoms, the three dimensional trajectory and spacial distribution of atomic beam are realized, then, the depositional characteristics of nanostuctures are described. It will explore an essential problem on neutral atomic motion and three dimensional distribution in diffraction laser standing wave. The study has an important research significance for the characters of atoms and its manipulation in diffraction standing laser field, and it can provide an academic support for nanometer grating deposition.

近共振激光驻波场汇聚中性原子沉积纳米光栅技术是一项新颖的研制纳米结构方法。当基片从激光驻波场的中心切入时会形成衍射效应，该种衍射将会导致激光驻波场的重新分布，从而对中性原子在激光驻波场中的运动特性和沉积特征产生重大影响，故此研究中性原子在衍射机制下的沉积特性具有重要意义。国内外相关研究中尚未考虑基片的衍射效应，且主要采用一维和二维分析方法，缺乏真实状态下中性原子在空间的三维运动和三维沉积特性。基于此，本项目在分析基片衍射效应的基础上构建衍射机制下激光驻波场与中性原子的相互作用模型，采用四阶龙格算法，通过中性原子在衍射激光驻波场作用下的运动轨迹仿真分析，完成纳米光栅沉积特性的三维全貌信息提取，继而以仿真参数为指导进行纳米光栅的实验制备，以探索衍射激光驻波场作用下中性原子运动和空间三维分布的本质问题。本研究将对阐明激光驻波场中原子的性质及激光驻波场对中性原子的操纵具有重要的研究意义。

近共振激光驻波场汇聚中性原子沉积纳米光栅技术是一项新颖的研制纳米结构方法。当基片从激光驻波场的中心切入时会形成衍射效应，该种衍射将会导致激光驻波场的重新分布，从而对中性原子在激光驻波场中的运动特性和沉积特征产生重大影响，故此研究中性原子在衍射机制下的沉积特性具有重要意义。国内外相关研究中尚未考虑基片的衍射效应，且主要采用一维和二维分析方法，缺乏真实状态下中性原子在空间的三维运动和三维沉积特性。基于此，本项目主要完成了如下方面的研究工作：（1）衍射效应作用下激光驻波场的光场分布特征建模分析，建立衍射激光驻波场；（2）以铬原子三维运动轨迹仿真为基础，利用累积算法对三维运动轨迹进行汇集计算；（3）通过对三维仿真结果和实验结果的比较，分析基片放置位置与衍射场特性参数之间的关系，分析减小衍射效应影响的方法。本研究将对阐明激光驻波场中原子的性质及激光驻波场对中性原子的操纵具有重要的研究意义。.基于项目的研究，在《中国科学》、《光学学报》、《红外与激光工程》、《Chinese Physics B》等国内外主流期刊发表研究论文11篇，其中SCI收录4篇，EI收录5篇，获得实用新型专利授权3件，获得广西科学技术奖（自然科学奖）二等奖1项。基于项目的研究，培养研究生4名，均已获得硕士学位。