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Current issue

ELEKTRO 2/2020 was released on February 12th 2020. Its digital version will be available on March 12th 2020.

Topic: Electrical apparatus, Internet of Things; Medical technologies

Main Article
Monitoring vacancy of an intelligent building

SVĚTLO (Light) 1/2020 was released on February 3th 2020. Its digital version will be available on March 3th 2020.

Fairs and exhibitions
Invitation for Light+Building 2020 – attendant programme
Prolicht+Sound fair celebrates the 25th birthday
FOR CITY 2020 introduces oneself in parallel to FOR ARCH fair

Luminaires and light apparatuses
Modern trends in automobile headlamps

Dielectric Metamaterial is Dynamically Tuned by Light

02.05.2018 | Duke University | www.duke.edu

Researchers at Duke University have built the first metal-free, dynamically tunable metamaterial for controlling electromagnetic waves. The approach could form the basis for technologies ranging from improved security scanners to new types of visual displays.

A metamaterial is an artificial material that manipulates waves like light and sound through properties of its structure rather than its chemistry. Researchers can design these materials to have rare or unnatural properties, like the ability to absorb specific ranges of the electromagnetic spectrum or to bend light backward.

Non-metal metamaterial

In the new technology, each grid location contains a tiny silicon cylinder just 50 microns tall and 120 microns wide, with the cylinders spaced 170 microns apart from one another. While silicon is not normally a conductive material, the researchers bombard the cylinders with a specific frequency of light in a process called photodoping. This imbues the typically insulating material with metallic properties by exciting electrons on the cylinders’ surfaces.

Read more at Duke University

Image Credit: Duke University

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