This paper-thin chip turns invisible light into a steerable beam

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 This paper-thin chip turns invisible light into a steerable beam

Researchers have built a paper-thin chip that converts infrared light into visible light and directs it precisely, all without mechanical motion. The design overcomes a long-standing efficiency-versus-control problem in light-shaping materials. This opens the door to tiny, highly efficient light sources integrated directly onto chips.


A rendering of the metasurface chip in action. When hit with an infrared laser, the microscopic chip converts the incoming light to a higher frequency and sends it out as a narrow beam that can be precisely directed. 

Creating extremely small devices that can precisely guide and control light is a key challenge for many emerging technologies. Scientists at the Advanced Science Research Center at the CUNY Graduate Center (CUNY ASRC) have now made an important advance by developing a metasurface that can convert invisible infrared light into visible light and direct it in specific directions without relying on any moving parts. Their findings are described in a new study published in the journal eLight.

The new metasurface takes the form of an ultra thin chip covered with tiny structures that are smaller than the wavelength of light itself. When an infrared laser strikes the surface, the chip shifts the light to a higher color (or frequency) and releases it as a tightly focused beam. The direction of that beam can be adjusted simply by changing the polarization of the incoming light.

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