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Hyperbolic metamaterials enable nanoscale 'fingerprinting'

https://www.eurekalert.org/pub_releases/2019-02/aiop-hme020819.php
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Feb 12, 2019 12:00 AM 2+ mon ago

Hyperbolic metamaterials enable nanoscale fingerprinting

Researchers use a narrow light beam in hyperbolic metamaterials to 'fingerprint' and obtain spatial and material information about nanometer-scale objects -- allowing identification without complete images

WASHINGTON, D.C., February 12, 2019 -- Hyperbolic metamaterials are artificially made structures that can be formed by depositing alternating thin layers of a conductor such as silver or graphene onto a substrate. One of their special abilities is supporting the propagation of a very narrow light beam, which can be generated by placing a nanoparticle on its top surface and illuminating it with a laser beam.

"One familiar example from everyday life is the fingerprint," said Theodore B. Norris, at the University of Michigan. "A fingerprint recognition system doesn't need to obtain a complete high-resolution image of the fingerprint -- it only needs to recognize it." So Evgenii E. Narimanov, one of the co-authors, began ...

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Metashells can adapt their wave-bending behavior based on the characteristics of the material they contain A chameleon can flexibly change its colour to match its surroundings. An...

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