In all-optical switch, nanowires manipulate light

U. PENNSYLVANIA (US) — Scientists have developed the first all-optical photonic switch fashioned from nanowires.

Researchers combined these photonic switches into a logic gate, a fundamental component of computer chips that process information, which they describe in the journal Nature Nanotechnology.

The innovation built on the team’s earlier work, which showed that their cadmium sulfide nanowires exhibited extremely strong light-matter coupling, making them especially efficient at manipulating light.


This quality is crucial for the development of nanoscale photonic circuits, as existing mechanisms for controlling the flow of light are bulkier and require more energy than their electronic analogs.

“The biggest challenge for photonic structures on the nanoscale is getting the light in, manipulating it once it’s there and then getting it out,” says Ritesh Agarwal, an associate professor in materials science and engineering at the University of Pennsylvania, who led the research with graduate student Brian Piccione.

“Our major innovation was how we solved the first problem, in that it allowed us to use the nanowires themselves for an on-chip light source,” explains Agarwal.

The research team began by precisely cutting a gap into a nanowire. They then pumped enough energy into the first nanowire segment that it began to emit laser light from its end and through the gap. Because the researchers started with a single nanowire, the two segment ends were perfectly matched, allowing the second segment to efficiently absorb and transmit the light down its length.

“Once we have the light in the second segment, we shine another light through the structure and turn off what is being transported through that wire,” Agarwal says. “That’s what makes it a switch.”

The researchers were able to measure the intensity of the light coming out of the end of the second nanowire and to show that the switch could effectively represent the binary states used in logic devices.

“Putting switches together lets you make logic gates, and assembling logic gates allows you to do computation,” Piccione says. “We used these optical switches to construct a NAND gate, which is a fundamental building block of modern computer processing.”

A “NAND gate,” which stands for “not and,” returns a “0” output when all its inputs are “1.” It was constructed by the researchers by combining two nanowire switches into a Y-shaped configuration.

NAND gates are important for computation because they are “functionally complete,” which means that, when put in the right sequence, they can do any kind of logical operation and thus form the basis for general-purpose computer processors.

“We see a future where ‘consumer electronics’ become ‘consumer photonics’,” Agarwal says. “And this study shows that is possible.”

The U.S. Army Research Office and the National Institutes of Health’s New Innovator Award Program supported the research.

Source: University of Pennsylvania

Related Articles