Analysis of Cr atom trajectory and focusing deposition in the standing wave field

Abstract

The laser-focused atomic deposition is a new way to build the nano transfer standard of high reliability adequate for application. Based on the semi-classical model, this paper starts from the motion equation of chromium atom in the laser standing wave field to get the trajectory of the atoms in the standing wave field by analytical simulation. The effects on focal line features are discussed as a result of the angular collimation, velocity spread in the atomic beam and the spherical aberration. The effects from different deposition positions are also discussed. This paper also gives a sample of the grating structure nanofabricated by laser focusing of Cr atoms.

Analysis of Cr atom focusing deposition properties in the double half Gaussian standing wave field

“…In semi-classical theory, when the atoms pass through the standing wave field, the effect of spontaneous radiation can normally be neglected and the system reaches a relatively stable state. While the dipole force of atoms is related to the potential of the optical field, in this field the potential can be written as [12] U(x, z)…”

Broadening of Cr nanostructures in laser-focused atomic deposition

“…Our basic approach based on the semiclassical equation of motion has been described in detail. [18] For advancing calculation accuracy, we introduce Adams-Bashforth-Moulton algorithm [19] instead of four-step Runge-Kutta algorithm. [18] Essentially, a lots of classical trajectories through the 'atom lens' formed by standing wave are calculated for random initial conditions of position, velocity and incident angle.…”

“…[18] For advancing calculation accuracy, we introduce Adams-Bashforth-Moulton algorithm [19] instead of four-step Runge-Kutta algorithm. [18] Essentially, a lots of classical trajectories through the 'atom lens' formed by standing wave are calculated for random initial conditions of position, velocity and incident angle. Each trajectory is assigned a probability according to a uniform spatial distribution, a thermal longitudinal velocity distribution and a transverse velocity distribution.…”

Simulation of Two-Dimensional Transverse Laser Cooling of Cesium Beam from Pyramidal Magneto-Optical Trap Atom Funnel

“…The so-segregated atoms can then be either directly deposited onto a substrate [5,6] or used to impress particle-sensitive resists [7] . In this experiment, a well collimated atomic beam is important because its divergence will limit the minimum of the structures [8,9] . Moreover, its spread of the longitudinal velocity distribution can lead to the chromatic aberration.…”