* Astronomy

Title: Tunable infrared plasmonic devices using graphene/insulator stacks
Authors: Hugen Yan, Xuesong Li, Bhupesh Chandra, George Tulevski, Yanqing Wu, Marcus Freitag, Wenjuan Zhu, Phaedon Avouris & Fengnian Xia

The collective oscillation of carriers - the plasmon - in graphene has many desirable properties, including tunability and low loss. However, in single-layer graphene, the dependence on carrier concentration of both the plasmonic resonance frequency and magnitude is relatively weak, limiting its applications in photonics. Here, we demonstrate transparent photonic devices based on graphene/insulator stacks, which are formed by depositing alternating wafer-scale graphene sheets and thin insulating layers, then patterning them together into photonic-crystal-like structures18. We show experimentally that the plasmon in such stacks is unambiguously non-classical.

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