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Nano-kirigami manipulate light in the nanoscale

Penelitian - Researchers for the first time apply nanokirigami approaches using nanodevices to manipulate light and open new possibilities for research and creation of new methods of communication, detection to new light-based computing devices.

Nicholas Fang from the Massachusetts Institute of Technology in Cambridge and colleagues built nanokirigami that incorporated the ancient origami art approach in creating a 3-D shape with folded paper and kirigami that allowed folding, but applied to flat matter at the nanoscale within one thousandth of a meter.

Penelitian Nano-kirigami manipulate light in the nanoscale

The findings reported to Science Advances are using standard microchip manufacturing technology where ion beams are focused to create the exact gap patterns in sheet metal only a few dozen nanometers thick. This process causes the foil to bend and twist into a three-dimensional form to selectively filter light with certain polarization.

New nanodevices are formed in only one single step and can be used to perform a number of different optical functions. The research team produced a nanomechanical equivalent of a special filter that could filter light where a pattern of only a few hundred nanometers in thin metal sheets and twist in one direction would select the appropriate spin of light.

"We cut the material using ion beams in sheet metal with the specified pattern. This is a very good connection of two fields, mechanics and optics," Fang said.

The researchers used a helical pattern to separate the opposite direction from light. The technique is so simple that it manipulates the desired set of optical characteristics and produces the gap and fold patterns required to produce an effect.

Fang and the team say more research will be needed on the application, but these devices are smaller that provide the potential for more complex areas of optical chips for sensing, computing and communication systems or biomedical devices including tools for measuring glucose levels that often use light polarity measurements.

"When passing through the light, you can see the concentration of one version of the molecule and this method enables a much smaller and more efficient detector. People have also been looking for laser optical communication systems, we have made in nanometer size," Fang said.

Journal : Zhiguang Liu et al. Nano-kirigami with giant optical chirality, Science Advances, 06 Jul 2018, DOI:10.1126/sciadv.aat4436



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