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 () and Mikhail D. Lukin ()
Additional contact information
Trond I. Andersen: Harvard University
Ryan J. Gelly: Harvard University
Giovanni Scuri: Harvard University
Bo L. Dwyer: Harvard University
Dominik S. Wild: Harvard University
Rivka Bekenstein: Harvard University
Andrey Sushko: Harvard University
Jiho Sung: Harvard University
You Zhou: Harvard University
Alexander A. Zibrov: Harvard University
Xiaoling Liu: Harvard University
Andrew Y. Joe: Harvard University
Kenji Watanabe: Research Center for Functional Materials, National Institute for Materials Science
Takashi Taniguchi: International Center for Materials Nanoarchitectonics, National Institute for Materials Science
Susanne F. Yelin: Harvard University
Philip Kim: Harvard University
Hongkun Park: Harvard University
Mikhail D. Lukin: Harvard University

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract 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.

Date: 2022
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DOI: 10.1038/s41467-022-29976-0

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