EurekAlert February 17, 2022 Using metasurfaces researchers in Norway designed a device in which a metasurface is suspended on a membrane ring made of a thin-film lead zirconate titanate (PZT) film, which allows the PZT to move the metasurface when a voltage is applied. To demonstrate how MEMS-metasurfaces could function as a varifocal lens doublet, they placed a second metasurface lens after the MEMS-metasurface. Varying the separation distance between the lenses through MEMS displacement allowed researchers to tune the focal point of the lens doublet on the fly. The researchers showed that applying 23 volts allowed the PZT membrane to […]
Tag Archives: S&T Norway
Preventing hurricanes using air bubbles
Science Daily March 19, 2018 Tropical hurricanes are generated when masses of cold and warm air collide. Another essential factor is that the sea surface temperature must be greater than 26.5°C. Researchers in Norway have developed a method which consists of supplying bubbles of compressed air from a perforated pipe lowered in the water, which then rise, taking with them colder water from deeper in the ocean. Initial investigation shows that by bringing cold water to the surface using the bubble curtains, the surface temperature will fall to below 26.5°C. The bubble curtains can be deployed from oil production platforms. […]