Created a "magic" liquid crystal window based on an ancient light trick

The scientists used the Pancharatnam-Berry Optical Element (PBOE), which is

liquid crystal deviceprinciple called the Pancharatnam-Berry phase. By changing the direction of the liquid crystal microparticles in this device, the researchers were able to change the properties of light as it passes through an object, pixel by pixel.

The development was based on technologyartisans from China and Japan who lived thousands of years ago. They made mirrors of bronze, which were no different from ordinary ones when a person looked at his own reflection, but in direct sunlight they formed a different image.

The principle of operation of ancient devices, scientists have understoodonly at the beginning of the 20th century. The resulting effect is that the image cast on the back of the mirror creates slight variations that form the images. And the mathematical basis for this phenomenon was derived in 2005 by Michael Berry.

And only now engineers have been able to apply the same principle to liquid crystals, creating from them both a mirror and a window.

After making the "magic" mirror and windowthe scientists used a camera to measure the saturation of the light they produced. The laser beam produced a visible image that remained constant even as the distance between the camera and the designed objects changed. The researchers also showed that the devices create images when illuminated by an LED light source.

Liquid crystals are materials that canflow like a normal liquid, but have molecules that can be oriented, as in solid crystals. In the new work, the researchers used a modified version of a well-known manufacturing process that creates a specific pattern of liquid crystal capable of producing the desired image when illuminated.

Read more

Look at the "silent" drone with a new generation of ion propulsion

Uranus is a very strange planet. We explain why astronomers want to send a probe to it

Scientists propose to revise the foundations of quantum physics and show where they do not work