1 research outputs found
A Centimeter-Scale Dielectric Metasurface for the Generation of Cold Atoms
The
single-beam magneto-optical trap (MOT) based on the diffractive
optical element offers a new route to develop compact cold atom sources.
However, the optical efficiency in the previous single-beam MOT systems
is usually low and unbalanced, which will affect the quality of the
trapped atoms. To solve this issue, we developed a centimeter-scale
dielectric metasurface optical chip with dynamic phase distributions,
which was used to split a single incident laser beam into five separate
ones with well-defined polarization states and uniform energy distributions.
The measured diffraction efficiency of the metasurface is up to 47%.
A single-beam MOT integrated with the metasurface optical chip was
then used to trap the 87Rb atoms with numbers ∼1.4
× 108 and temperatures ∼7.0 μK. The proposed
concept in this work may provide a promising solution for developing
ultracompact cold atom sources