Circularly polarized light, where electromagnetic waves spiral either clockwise or counterclockwise as they travel, is essential in many applications, including medical imaging and advanced communication technologies. However, producing this type of light typically requires large, complex optical systems that are difficult to integrate into compact devices.
To overcome this limitation, a research team from Singapore, led by Associate Professor Wu Lin of the Singapore University of Technology and Design (SUTD), has developed a groundbreaking metasurface — an ultra-thin material with unique properties not found in nature. This innovation has the potential to replace traditional bulky optical setups. Their findings were published in Physical Review Letters in a paper titled “Enabling all-to-circular polarization up-conversion by nonlinear chiral metasurfaces with rotational symmetry.”
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