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Current issue

ELEKTRO 4/2019 was released on April 17th 2019. Its digital version will be available on May 13th 2019.

Topic: Topic: Electroinstallation; Smart buildings; IoT; HVAC; Security technology

Main Article
Smart Cities (part 9)

SVĚTLO (Light) 2/2019 was released on March 15th 2019. Its digital version will be available immediately.

Architectural and scenic lighting
The architectural lighting of Bečov nad Teplou castle
Lighting design in a nutshell – Part 41
The analyse of light picture a little more theoretic

Day light
Biggest mistakes in day lighting design of buildings

Electrically tunable metasurfaces pave the way toward dynamic holograms

03.03.2017 | Applied Physics Letters | aip.scitation.org

Dynamic holograms allow three-dimensional images to change over time like a movie, but so far these holograms are still being developed. The development of dynamic holograms may now get a boost from recent research on optical metasurfaces, a type of photonic surface with tunable optical properties.

A metasurface is a thin sheet consisting of a periodic array of nanoscale elements. The exact dimensions of these elements is critical, since they are specifically designed to manipulate certain wavelengths of light in particular ways that enhance their electric and magnetic properties.

Dynamic holograms

Here, the scientists demonstrated how to manipulate a metasurface by applying an electrical voltage. By switching the control voltage “on” and “off,” the researchers could change the optical transmission of the metasurface. For instance, they could tune the transmission from opaque to the transparent regime for certain wavelengths, achieving a transmittance change of up to 75%. The voltage switch could also change the phase of certain wavelengths by up to 180°.

Read more at Applied Physics Letters

Image Credit: Applied Physics Letters

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