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Scientists generate world’s sharpest X-ray beam

October 1, 2013 By Janet Vasquez Leave a Comment

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The scientists have successfully developed the world’s sharpest X-ray beam which is ten thousand times thinner than a strand of hair.

Researchers led by Professor Tim Salditt from the University of Gottingen have created the fine beam of X-ray light which is barely 5 nanometres in diameter. The light allows focusing on smallest details. The thickness of the layers is selected in such a way that the bright areas of the diffraction pattern coincide at the same spot.

“Instead of a common lens, we use a so-called Fresnel lens which consists of several layers,” said co-author Dr Markus Osterhoff.

The central support is a fine tungsten wire with the thickness of only a thousandth of a millimetre. Around the wire, nanometre-thin silicon and tungsten layers are applied in an alternating way. The physicists then cut a thin slice from the coated wire.

x-ray
“This slice has 50 to 60 silicon and tungsten layers, comparable to growth rings of a tree,” said team member Florian Doring.

“And the layer thicknesses have to be extremely precise,” Christian Eberl added. The wire slice with a size of only about two thousandth of a millimeter is used as a lens. However, it does not diffract light like a glass lens but scatters it like an optical grid generating a pattern of bright and dark patches.

On the principle of ‘the more precise the lens is fabricated; the sharper becomes the X-ray focus’, the physicists obtained an X-ray beam of 4.3 nanometers (millionth of a millimeter) diameter in horizontal direction and 4.7 nanometers diameter in vertical direction.

The fine X-ray beam opens up new possibilities for materials science, eg the investigation of nano wires to be used in solar cells.

The study was published in the journal Optics Express.

 

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Filed Under: Lifestyle Tagged With: X-ray beam, x-rays

About Janet Vasquez

Janet hasn’t had the happiest of childhoods. Her parents shipped her off to a girl-only boarding school when she was merely a child. After a few years spent with the nuns she unexpectedly remained pregnant and was kicked from the school. But this didn’t hinder her.

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