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Current issue

ELEKTRO 11/2021 was released on November 4th 2021. Its digital version will be available immediately.

Topic: Electrical switchboards and switchboard technologies, drives and power electronics

Main article
Electromobility in 2021

SVĚTLO (Light) 4-5/2021 was released 9.17.2021. Its digital version will be available 9.17.2021.

Lighting installations
Lighting reconstruction of underpass and platforms of Ústí nad Orlicí railway station

Public lighting
The lighting of park at Episcopal Residence of Ostrava-Opava in Ostrava
Outdoor lighting systems and intrusive light
Generel of public lighting 9th part
Environmental viewpoint

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

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