The bacterium Bacillus beveridgei strain MLTeJB, which is composed of aggregated tellurium shards. Image: US Geological Survey.
The bacterium Bacillus beveridgei strain MLTeJB, which is composed of aggregated tellurium shards. Image: US Geological Survey.

An international team of researchers has reported a new way to safeguard drones, surveillance cameras and other equipment against laser attacks, which can disable or destroy the equipment. This capability is known as optical limiting.

In a paper in Nature Communications on this work, the researchers also describe a superior manner of telecom switching without the use of electronics, through their development of an all-optical method that could improve the speed and capacity of internet communications. This could remove a roadblock in moving from 4G to 5G networks.

Both these advances are down to a novel nanocomposite created using tellurium nanorods – produced by naturally occurring bacteria – which makes an effective nonlinear optical material. Not only is it capable of protecting electronic devices against high-intensity bursts of light, including those emitted by inexpensive household lasers targeted at aircraft, drones or other critical systems, but it could also be the material of choice for next-generation optoelectronic and photonic devices.

Seamus Curran, a physics professor at the University of Houston and one of the paper's authors, said that while most optical materials are chemically synthesized, using a biologically based nanomaterial proved less expensive and less toxic. "We found a cheaper, easier, simpler way to manufacture the material," he said. "We let Mother Nature do it."

These new findings grew out of earlier work by Curran and his team, working in collaboration with Werner Blau at Trinity College Dublin in Ireland and Ron Oremland with the US Geological Survey. Curran initially synthesized the nanocomposites to examine their potential in the photonics world. He holds a US patent, as well as an international series of patents, for that work.

The researchers noted that using bacteria to create the nanocrystals suggests an environmentally friendly route of synthesis, while generating impressive results. "Nonlinear optical measurements of this material reveal the strong saturable absorption and nonlinear optical extinctions induced by Mie scattering overbroad temporal and wavelength ranges," they wrote in the paper. "In both cases, Te [tellurium] particles exhibit superior optical nonlinearity compared to graphene."

Light at very high intensity, such as that emitted by a laser, can have unpredictable polarizing effects on certain materials, Curran explained, and physicists have been searching for suitable nonlinear materials that can withstand these effects. One goal, he said, is a material that can effectively reduce the light intensity, allowing a device to be developed that could prevent damage by light.

The researchers also used the nanocomposite, which comprises biologically generated elemental tellurium nanocrystals embedded in a polymer, to build an electro-optic switch – an electrical device used to modulate beams of light – that is immune to damage from a laser.

Oremland noted that the current work grew out of 30 years of basic research, stemming from the initial discovery of selenite-respiring bacteria and the fact that the bacteria form discrete packets of elemental selenium. "From there, it was a step down the Periodic Table to learn that the same could be done with tellurium oxyanions," he said. "The fact that tellurium had potential application in the realm of nanophotonics came as a serendipitous surprise."

Blau said the biologically generated tellurium nanorods are especially suitable for photonic device applications in the mid-infrared range. "This wavelength region is becoming a hot technological topic as it is useful for biomedical, environmental and security-related sensing, as well as laser processing and for opening up new windows for fiber optical and free-space communications."

Work will continue on expanding the material's potential for use in all-optical telecom switches, which Curran said is critical for expanding broadband capacity. "We need a massive investment in optical fiber," he said. "We need greater bandwidth and switching speeds. We need all-optical switches to do that."

This story is adapted from material from the University of Houston, with editorial changes made by Materials Today. The views expressed in this article do not necessarily represent those of Elsevier. Link to original source.