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International Conference on Atomic Physics (ICAP)

Atom interferometers and atom holography

Fujio Shimizu, Jun‐ichi Fujita, Makoto Morinaga, T. Kishimoto, S. Mitake

Published Jan 1, 1999• 0 citations
Publisher

Abstract

Various techniques of atom manipulation with a binary hologram are discussed and demonstrated experimentally. An atomic beam of metastable neon in the 1s3 state and a SiN thin film with holes that expresses the transmission function of the hologram are used to demonstrate this technique. The gray-scale holography of atoms is demonstrated for the first time. Other possibilities of holographic manipulation of atoms are also discussed.

DOI
10.1063/1.59358

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Various techniques of atom manipulation with a binary hologram are discussed and demonstrated experimentally. An atomic beam of metastable neon in the 1s3 state and a SiN thin film with holes that expresses the transmission function of the hologram are used to demonstrate this technique. The gray-scale holography of atoms is demonstrated for the first time. Other possibilities of holographic manipulation of atoms are also discussed.
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.
Summary form only given. We have demonstrated the manipulation of a cold neon atomic beam in a metastable state by using a silicon nitride thin film with holes that expressed the pattern of a binary hologram. The atoms that passed through the computer generated binary hologram reconstructed an arbitrary pattern of atoms on the surface of a microchannel plate detector. In this paper we describe the technique that enables us to control the reconstructed pattern in real time. We deposited regularly spaced stripes of platinum electrodes on the thin film hologram. Holes were open in the gap between the stripes, and we modulated the electric potential of the electrodes. This modulated the phase of the atom that passed through the hole in proportion to the square of the potential difference of the adjacent electrodes. Two types of phase controlled holography were demonstrated.
Atomic beam holography is a unique technique by which to fabricate a nanoscale object by using the interference of matter waves of ultracold atoms. The atomic de Broglie wave coming through a hologram interferes with and reconstructs a desired structure on a substrate. We first demonstrated holographic manipulation of metastable Ne atoms of 7 nm wavelength, where we showed the reconstruction of an “F” pattern and improvement of it. In this article, we propose and show techniques to manipulate three-dimensionally cooled Ne atoms. Atomic beam holography has the potential to make atomic-size objects, and the freedom in designing the hologram enables us to make not only a binary pattern but also an analog (gray scale) pattern. The resolution demonstrated in this experiment was about 60μ, but the minimum feature size expected is theoretically the same as the wavelength, i.e., several nanometers.
Electric-field-controlled atomic holography has been demonstrated. A binary hologram pattern was encoded in the gaps of regularly spaced parallel stripes of platinum electrodes formed on SiN4 thin film. Each electrode was either grounded or connected to a terminal. The electrode connections were arranged so that an electric field appeared in approximately half the 512 gaps when a finite voltage was applied to the terminal. By controlling this voltage, we could shift, erase, or switch holographically reconstructed two-dimensional images of atoms on a screen.
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.
A method of generating an arbitrary pattern of atoms by using an interferometric technique is reported. A laser-cooled metastable Ne atomic beam in the 1s3{1s}_{3}1s3​ state is diffracted by a computer generated binary hologram. A black-and-white pattern is drawn on a microchannel detector with a spatial resolution exceeding $65\ensuremath{\mu}\mathrm{m}$ and a resolving power better than 303030.