Figure - available from: Journal of Physics B: Atomic Molecular and Optical Physics
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(a) Interferograms with a peak atomic velocity of 14 m s⁻¹ and velocity spread of 1 m s⁻¹ for a VdW coefficient of 1 a.u. (black), 1.5 a.u. (red), 2 a.u. (blue). (b) The relative peak height, measured from the 0th order peak height plotted over a changing of VdW potential, for the 2nd (black), 3rd (red), 4th (blue), 5th (pink) and 6th (green) interference order fringe. For an atomic velocity of 14 m s⁻¹ and velocity spread of 1 m s⁻¹.
Source publication
We describe the creation and characterisation of a velocity tunable, spin-polarized beam of slow metastable argon atoms. We show that the beam velocity can be determined with a precision below 1% using matter-wave interferometry. The profile of the interference pattern was also used to determine the velocity spread of the beam, as well as the Van d...
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Citations
... Over the past decade, a variety of CP force measurements has been demonstrated, employing a range of techniques. These include the use of ultracold atoms [21,22], spectroscopy methods with nanoscopic cells [7,23,24], and atomic diffraction through material nanogratings using a supersonic [25] or slow atomic beam [26,27]. Despite the advancement of these techniques, challenges remain. ...
... Therefore, the accurate estimation of uncertainty remains a very challenging task. Finally, the experimental value obtained in this study is also consistent with other experimental values reported in previous studies: C 3 = 5.0 meV nm 3 in [26], C 3 = 7.4 meV nm 3 in [27], and C 3 = 7.4 meV nm 3 in [47]. However, these studies did not consider or acknowledge the impact of nanograting geometries on the CP potential. ...
We present a method utilizing atomic diffraction patterns and statistical analysis tools to infer the Casimir-Polder interaction between argon atoms and a silicon nitride nanograting. The quantum model that supports the data is investigated in detail, as are the roles of nanograting geometry, finite-size effects, slit width opening angles, Lennard-Jones potentials, and patch potentials. Our findings indicate that the atom-surface potential strength parameter is C 3 = 6.9 ± 1.2 meV nm 3 . This value is primarily constrained by the knowledge of the nanograting geometry. The high sensitivity of our method paves the way for precise determination of the Casimir-Polder potential and exploration of new short-distance forces.
Published by the American Physical Society 2025
