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Acta Physica Sinica

The theory and realization of atomic beam CGH

Shi Jian-Ping, Chen Xu-Nan, Gao Hong-Tao, Chen Xian-Zhong, 中国科学院光电技术研究所微细加工光学技术国家重点实验室,成都610209

Published Jan 1, 2003• 0 citations
Publisher

Abstract

The realization of atom-beam holography by computer generated hologram have been presented in this paper, which can decrease the difficulty of the atom holography. Firstly the wave nature and cooling mechanism of atoms are analyzed, then the design process and a facture of the atomic SiN film hologram is shown, and finally we present a theoretical plan and the picture of an experiment system.

DOI
10.7498/aps.52.844

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The realization of atom-beam holography by computer generated hologram have been presented in this paper, which can decrease the difficulty of the atom holography. Firstly the wave nature and cooling mechanism of atoms are analyzed, then the design process and a facture of the atomic SiN film hologram is shown, and finally we present a theoretical plan and the picture of an experiment system.
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A gray-scale photographic image of atoms has been generated by using a computer-designed thin-film hologram. An ultra-cold neon atomic beam in the 1s 3 state was transmitted through a thin-film binary hologram made of SiN4 and generated a pattern of atoms on a micro-channel plate detector. The design and the quality evaluation of the hologram for gray-scale pictures are discussed theoretically. The validity of the theoretical analysis has been tested by a hologram that generated a simple test pattern.
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We describe various techniques to manipulate laser-cooled Ne atoms interferometrically by using a silicon nitride film with holes and electrode deposition. Laser-cooled Ne atoms pass through a computer-generated through-hole binary hologram and generate an atomic image on a substrate. The hologram can be designed to provide a spherical phase correction, and the reconstructed pattern is focused on the substrate at a finite distance from the hologram. Such holographic manipulation can be extended to gray-scaled reconstruction that is used to deposit relief-like 3D atomic patterns on surfaces. In addition, an atom interacts with electric, magnetic, and optical fields. This provides the holographic atomic-wave manipulation to perform functions that are difficult for a light wave. The Stark shift induced by an external electric field is used to switch and to modify atomic patterns in real time. We also introduce an reflecting type atom holography by using quantum reflection.
We have demonstrated the generation of a black-and-white atomic pattern by using a thin-film computer generated hologram. To extend this technique for the generation of a more complicated gray-scale pattern of atoms, however, considerable improvement is necessary in two points. For a black-and-white holography a single atom is sufficient to express a point on the imaging surface. Therefore, the number of atoms that is required to draw a pattern with the N /spl times/ N resolution is approximately N/sup 2//2 atoms.