Diffractive mirrors for neutral-atom matter-wave optics

Area of Science:

• Atomic and Molecular Physics
• Optics
• Materials Science

Background:

• Mirrors for atoms and molecules are crucial for neutral particle matter-wave optics.
• Previous mirrors required specialized conditions like smooth crystal surfaces, tailored fields, nanofabrication, or particle cooling due to short de Broglie wavelengths and strong surface interactions.

Purpose of the Study:

• To demonstrate the feasibility of using inexpensive, commercially available gratings as mirrors for neutral particles.
• To investigate the impact of grating properties on mirror performance for atomic reflection.

Main Methods:

• Reflection of helium (He) atoms from various blazed gratings designed for light waves.
• Utilizing holographic gratings with different periods, including one with a 417 nm period.
• Studying the effect of microscopic and macroscopic grating characteristics on reflectivity.

Main Results:

• Successful reflection of He atoms from commercial gratings.
• Achieved up to 47% reflectivity for He atoms using a holographic grating with a 417 nm period.
• Observed reflection of helium dimer (He₂) and trimer (He₃) molecules.

Conclusions:

• Commercial gratings are viable and cost-effective mirrors for thermal energy atoms and molecules.
• The demonstrated grating technology may extend to other fragile particles like metastable atoms or antihydrogen.
• This opens new possibilities for matter-wave optics applications with readily available materials.