沟道效应作用下中性原子在激光驻波场中的沉积特性研究

基于半经典理论，建立了中性原子与激光驻波场相互作用的模型，分析了中性原子在激光驻波场沟道效应作用下运动轨迹及沉积特性，探讨了球差、色差和原子束发散角对沉积条纹的影响. 得到了上述三种影响因素下纳米光栅的半高宽分别为0.532，12.16，96.70 nm. 仿真结果表明，随着原子束发散角度的增加，沉积条纹的对比度将会下降，当原子束发散角分别为0.1 mard时，其对比度为85.2：1，发散角为0.3 mrad时，条纹对比度为5.33：1，而当发散角增加至0.5 mrad以上时，沉积条纹将会出现分裂现象，导致条纹的恶化.关键词：激光驻波场纳米光栅沟道效应

Characteristics of neutral atom deposition under channel effect in a laser standing wave field

Based on semi-classical theory, a model of the interaction between neutral atoms and the laser standing wave field is established in this paper. The trajectories and the deposition characteristics are analyzed under channel effect, and the values of full width at half maximum of nano-grating are 0.532, 12.16 and 96.70 nm when the divergence angle, spherical and chromatic aberration are discussed, respectively. The simulation results show that the contrast of the stripe decreases with the increasing of divergence angle of the atomic beam. Also, the contrasts of the stripe are 85.2:1 and 5.33:1 when the divergence angles equal 0.1 and 0.3 mrad. When divergence angle increases over 0.5 mrad, the splitting of the stripe takes place, leading to the degradation of the deposition.
Keywords：laser standing wave fieldnano-gratingchannel effect