Nanomaterials Created Using Light

Monday, July 28, 2014

Building with Light

Researchers from the University of Cambridge have devised a new method to stitch nanoparticles in a way that light is refracted in a wrong way so that it is rendered invisible. The key to any sort of invisibility effect lies in the way light interacts with a material. Lights’ absorption or reflection upon hitting a surface enables us to see objects. However, by engineering materials at the nanoscale, it is possible to produce 'meta–materials' that can control the way in which light interacts with them.

The technique developed by the Cambridge team involves stitching gold nanoparticles together into long strings and using unfocused laser light as billions of needles. These strings can then be stacked into layers much like the Lego bricks. In order to make the strings, researchers first used barrel–shaped molecules called cucurbiturils (CBs). The CBs act like the miniature spacers that locks nanoparticles in place by controlling the space between them.

When a laser is focused on the strings of particles in the CB scaffolds, it produces plasmons; ripples of electrons at the surfaces of conducting metals. These electrons concentrate light energy on atoms at the surface and join them to form bridges between the nanoparticles. Researchers state that they have achieved the control of dimensions in creating invisible devices in a way that has never been achieved before. Meta–materials have a wide range of potential applications, including sensing and improving military stealth technology.

The most wonderful and precious element of universe is the human life which can only be guided by the right knowledge and right attitude. So, here is an ocean of knowledge, both in English and Hindi encompassing every detail and each facet of human life which ‘one must know’ in order to grow and attain the summits of success. A team of around 200 dedicated members is working ceaselessly to turn such a colossal dream into reality. We are confident that this portal will help bring change in people across the world.

Content creation, research, development and execution done in-house at Aatman Innovations.