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Then, Du and his collaborators worked with two laser beams, each with a different frequency, or color, and circular polarization, or direction of the laser's electric field.

The survey looks at a large amount of sky for highly variable radio wave sources, and collects circular polarization, among other data.

Although other telescopes are collecting polarization data, there have only been a few large-scale radio surveys using the circular polarization technique.

Both phones also use circular polarization display technology, so that the screen is visible from any angle when viewing it with polarized sunglasses.

In particular, in the valley Hall effect, the two valleys are associated with photons of opposite circular polarization in the plane of the material.