Optimization of laser focused atomic deposition by channeling*

Abstract

Laser focused atomic deposition is a unique and effective way to fabricate highly accurate pitch standards in nanometrology. However, the stability and repeatability of the atom lithography fabrication process remains a challenging problem for massive production. Based on the atom–light interaction theory, channeling is utilized to improve the stability and repeatability. From the comparison of three kinds of atom–light interaction models, the optimal parameters for channeling are obtained based on simulation. According to the experimental observations, the peak to valley height of Cr nano-gratings keeps stable when the cutting proportion changes from 15% to 50%, which means that the channeling shows up under this condition. The channeling proves to be an effective method to optimize the stability and repeatability of laser focused Cr atomic deposition.

Limits of the adiabaticity assumption and conditions for improving laser focusing of atomic matter wave

“…To the best of our knowledge, such conditions have not yet been systematically explored despite continued interests in the problem. [20][21][22] For such investigations, in silico approaches based on accurate numerical simulations would be much more efficient. Adiabaticity is a key assumption in atom manipulation methods, so it is critical to examine whether the assumption is valid for a given set of experimental conditions.…”

Transverse Propagation Characteristics and Coherent Effect of Gaussian Beams*

“…[5−9] Those works are concentrated on the longitudinal field of light beams. Because the longitudinal energy is a benefit for particle acceleration, [10] fluorescent imaging, second-harmonic generation, [11,12] atomic deposition, [13] and Raman spectroscopy. [14] Furthermore, it has been practical to create a pure longitudinal light beam.…”