Atomically thin material opens door for integrated nanophotonic circuits

Far-field photons excite silver nanowire plasmons. The wire plasmons propagate to the wire's distal end where they efficiently interact with the two-dimensional material semiconductor molybdenum disulfide (MoS2). The plasmons are absorbed in the MoS2 creating excitons that subsequently decay converting back into propagating photons. Credit: Illustration by Michael Osadciw, Creative Services, University of Rochester — Far-field photons excite silver nanowire plasmons. The wire plasmons propagate to the wire’s distal end where they efficiently interact with the two-dimensional material semiconductor molybdenum disulfide (MoS2). The plasmons are absorbed in the MoS2 creating excitons that subsequently decay converting back into propagating photons.
Credit: Illustration by Michael Osadciw, Creative Services, University of Rochester

A new combination of materials can efficiently guide electricity and light along the same tiny wire, a finding that could be a step towards building computer chips capable of transporting digital information at the speed of light.

Reporting today in The Optical Society‘s (OSA) high-impact journal Optica, optical and material scientists at the University of Rochester and Swiss Federal Institute of Technology in Zurich describe a basic model circuit consisting of a silver nanowire and a single-layer flake of molybdenum disulfide (MoS2).

Using a laser to excite electromagnetic waves called plasmons at the surface of the wire, the researchers found that the MoS2 flake at the far end of the wire generated strong light emission. Going in the other direction, as the excited electrons relaxed, they were collected by the wire and converted back into plasmons, which emitted light of the same wavelength.

“We have found that there is pronounced nanoscale light-matter interaction between plasmons and atomically thin material that can be exploited for nanophotonic integrated circuits,” said Nick Vamivakas, assistant professor of quantum optics and quantum physics at the University of Rochester and senior author of the paper.

Typically about a third of the remaining energy would be lost for every few microns (millionths of a meter) the plasmons traveled along the wire, explained Kenneth Goodfellow, a graduate student at Rochester’s Institute of Optics and lead author of the Optica paper.

“It was surprising to see that enough energy was left after the round-trip,” said Goodfellow.

Photonic devices can be much faster than electronic ones, but they are bulkier because devices that focus light cannot be miniaturized nearly as well as electronic circuits, said Goodfellow. The new results hold promise for guiding the transmission of light, and maintaining the intensity of the signal, in very small dimensions.

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