Beam steering at the nanosecond time scale with an atomically thin reflector

Trond I. Andersen, Ryan J. Gelly, Giovanni Scuri, Bo L. Dwyer, Dominik S. Wild, Rivka Bekenstein, Andrey Sushko, Jiho Sung, You Zhou, Alexander A. Zibrov, Xiaoling Liu, Andrew Y. Joe, Kenji Watanabe, Takashi Taniguchi, Susanne F. Yelin, Philip Kim, Hongkun Park*, Mikhail D. Lukin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Techniques to mold the flow of light on subwavelength scales enable fundamentally new optical systems and device applications. The realization of programmable, active optical systems with fast, tunable components is among the outstanding challenges in the field. Here, we experimentally demonstrate a few-pixel beam steering device based on electrostatic gate control of excitons in an atomically thin semiconductor with strong light-matter interactions. By combining the high reflectivity of a MoSe2 monolayer with a graphene split-gate geometry, we shape the wavefront phase profile to achieve continuously tunable beam deflection with a range of 10°, two-dimensional beam steering, and switching times down to 1.6 nanoseconds. Our approach opens the door for a new class of atomically thin optical systems, such as rapidly switchable beam arrays and quantum metasurfaces operating at their fundamental thickness limit.

Original languageAmerican English
Article number3431
JournalNature Communications
Issue number1
StatePublished - Dec 2022
Externally publishedYes

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© 2022, The Author(s).


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