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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

Lasers etch a ‘perfect’ solar energy absorber

05.02.2020 | University of Rochester | www.rochester.edu

The University of Rochester research lab that recently used lasers to create unsinkable metallic structures has now demonstrated how the same technology could be used to create highly efficient solar power generators.

Research, published in a Light: Science & Applications, describes using powerful femto-second laser pulses to etch metal surfaces with nanoscale structures that selectively absorb light only at the solar wavelengths, but not elsewhere. A regular metal surface is shiny and highly reflective. Years ago, the researchers developed a black metal technology that turned shiny metals pitch black. “But to make a perfect solar absorber we need more than a black metal and the result is this selective absorber.”

Solar energy absorber

The researchers experimented with aluminum, copper, steel, and tungsten, and found that tungsten, commonly used as a thermal solar absorber, had the highest solar absorption efficiency when treated with the new nanoscale structures. This improved the efficiency of thermal electrical generation by 130 percent compared to untreated tungsten.

Read more at University of Rochester

Image Credit: J. Adam Fenster

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