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Specular reflection of matter waves from a rough mirror
V Savalli1, D Stevens, J Estève
1Laboratoire Charles Fabry de l'Institut d'Optique, UMR 8501 du CNRS, 91403 Orsay Cedex, France.
Physical Review Letters
|July 5, 2002
Summary
We studied atomic reflection from evanescent wave mirrors using Raman transitions. A double reflection structure was observed, with specular and diffuse components, influenced by detuning and potential roughness.
Area of Science:
- Atomic physics
- Quantum optics
- Surface science
Background:
- Evanescent wave mirrors are crucial for atom manipulation.
- Understanding atomic reflection specularity is key for quantum technologies.
- Velocity selective Raman transitions offer high-resolution atomic state control.
Purpose of the Study:
- To investigate the specularity of atomic reflection from an evanescent wave mirror.
- To analyze the velocity distribution of reflected atoms with high resolution.
- To identify the factors contributing to diffuse reflection.
Main Methods:
- Utilized high-resolution velocity selective Raman transitions.
- Employed an evanescent wave mirror for atomic reflection.
- Analyzed the velocity distribution of reflected atoms post-interaction.
Main Results:
- Observed a distinct double structure in the atomic velocity distribution.
- Identified a specular reflection peak and a diffuse reflection pedestal.
- Found that diffuse reflection contribution decreases with increasing detuning.
Conclusions:
- Diffuse reflection arises from spontaneous emission and evanescent wave potential roughness.
- Evanescent wave potential roughness amplitude is below the atomic de Broglie wavelength.
- The findings provide insights into atom-surface interactions and mirror reflectivity.