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Photonic crystals for nano-light in moiré graphene superlattices

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Science  07 Dec 2018:
Vol. 362, Issue 6419, pp. 1153-1156
DOI: 10.1126/science.aau5144

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Twisting a route for surface plasmons

Graphene is an atomically thin material that supports highly confined plasmon polaritons, or nano-light, with very low loss. The properties of graphene can be made richer by introducing and then rotating a second layer so that there is a slight angle between the atomic registry. Sunku et al. show that the moiré patterns that result from such twisted bilayer graphene also provide confined conducting channels that can be used for the directed propagation of surface plasmons. Controlling the structure thereby provides a pathway to control and route surface plasmons for a nanophotonic platform.

Science, this issue p. 1153