Photonic crystal for graphene plasmons

L. Xiong, C. Forsythe, M. Jung, A. S. McLeod, S. S. Sunku, Y. M. Shao, G. X. Ni, A. J. Sternbach, S. Liu, J. H. Edgar, E. J. Mele, M. M. Fogler, G. Shvets, C. R. Dean, D. N. Basov

Research output: Contribution to journalArticlepeer-review

Abstract

Photonic crystals are commonly implemented in media with periodically varying optical properties. Photonic crystals enable exquisite control of light propagation in integrated optical circuits, and also emulate advanced physical concepts. However, common photonic crystals are unfit for in-operando on/off controls. We overcome this limitation and demonstrate a broadly tunable two-dimensional photonic crystal for surface plasmon polaritons. Our platform consists of a continuous graphene monolayer integrated in a back-gated platform with nano-structured gate insulators. Infrared nano-imaging reveals the formation of a photonic bandgap and strong modulation of the local plasmonic density of states that can be turned on/off or gradually tuned by the applied gate voltage. We also implement an artificial domain wall which supports highly confined one-dimensional plasmonic modes. Our electrostatically-tunable photonic crystals are derived from standard metal oxide semiconductor field effect transistor technology and pave a way for practical on-chip light manipulation.

Original languageEnglish (US)
Article number4780
JournalNature communications
Volume10
Issue number1
DOIs
StatePublished - Dec 1 2019
Externally publishedYes

Bibliographical note

Funding Information:
Research at Columbia is supported as part of Programmable Quantum Materials, an Energy Frontier Research Center funded by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES), under award DE-SC0019443. M.M.F. is supported by ONR-N000014-18-1-2722. Theoretical interpretation of the confinement of domain wall modes (E.J.M.) was supported by the DOE Office of Basic Energy Sciences under grant DE-FG02-ER45118. The hBN crystal growth was supported by the National Science Foundation, award CMMI #1538127.

Publisher Copyright:
© 2019, The Author(s).

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