We Continue the Work of Those
Who Were the First.

  • Electrotechnics
  • Electrical Engineering
  • Light & Lighting
  • Power Engineering
  • Transportation
  • Automation
  • Communication
  • Smart Buildings
  • Industry
  • Innovation

Current issue

ELEKTRO 12/2018 was released on December 12th 2018. Its digital version will be available on January 1st 2019.

Topic: Measurement engineering and measuring instruments; Testing industry and diagnostics

Main Article
Thermovision measurement in electrical power engineering
Smart Cities (part 5)

SVĚTLO (Light) 6/2018 was released on December 3rd 2018. Its digital version will be available on January 4th 2019.

Luminaires and light apparatuses
Modular floodlights Siteco
Decorative luminaire PRESBETON H-E-X from the integral series town equipment
LED luminaires ESALITE – revolution in sphere of industrial lighting

Daylight
About median illumination by daylight
Professional colloquium Daylight in practice

Two Holograms in One Surface

11.12.2017 | Caltech | www.caltech.edu

A team at Caltech has figured out a way to encode more than one holographic image in a single surface without any loss of resolution. The engineering feat overturns a long-held assumption that a single surface could only project a single image regardless of the angle of illumination.

Led by Andrei Faraon, assistant professor of applied physics and materials science in the Division of Engineering and Applied Science, the team developed silicon oxide and aluminum surfaces studded with tens of millions of tiny silicon posts, each just hundreds of nanometers tall. (For scale, a strand of human hair is 100,000 nanometers wide.) Each nanopost reflects light differently due to variations in its shape and size, and based on the angle of incoming light.

One hologram on single surface

That last property allows each post to act as a pixel in more than one image: for example, acting as a black pixel if incoming light strikes the surface at 0 degrees and a white pixel if incoming light strikes the surface at 30 degrees.

Read more at Caltech

 Image Credit: Andrei Faraon/Caltech

-jk-