Scientists have developed a nano-antenna that is capable of generating a field of circularly polarized light. This type of light has a variety of applications, including optical communications and medical imaging. The nano-antenna is made from a nanoparticle of gold, and is just 500 nanometers in size, making it one of the smallest antennas ever created. The antenna is able to generate a field of circularly polarized light, which is a special kind of light that has a rotating electric field. This makes it useful for a variety of applications, including optical communications and medical imaging. The researchers believe that this new antenna could lead to more efficient and cost-effective optical communication systems.

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source: Phys.org