2D semiconductor nonlinear plasmonic modulators

Matthew Klein, Bekele H. Badada, Rolf Binder, Adam Alfrey, Max McKie, Michael R. Koehler, David G. Mandrus, Takashi Taniguchi, Kenji Watanabe, Brian J. LeRoy and John R. Schaibley ()
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Matthew Klein: University of Arizona
Bekele H. Badada: University of Arizona
Rolf Binder: University of Arizona
Adam Alfrey: University of Arizona
Max McKie: University of Arizona
Michael R. Koehler: University of Tennessee
David G. Mandrus: University of Tennessee
Takashi Taniguchi: National Institute for Materials Science
Kenji Watanabe: National Institute for Materials Science
Brian J. LeRoy: University of Arizona
John R. Schaibley: University of Arizona

Nature Communications, 2019, vol. 10, issue 1, 1-7

Abstract: Abstract A plasmonic modulator is a device that controls the amplitude or phase of propagating plasmons. In a pure plasmonic modulator, the presence or absence of a plasmonic pump wave controls the amplitude of a plasmonic probe wave through a channel. This control has to be mediated by an interaction between disparate plasmonic waves, typically requiring the integration of a nonlinear material. In this work, we demonstrate a 2D semiconductor nonlinear plasmonic modulator based on a WSe2 monolayer integrated on top of a lithographically defined metallic waveguide. We utilize the strong interaction between the surface plasmon polaritons (SPPs) and excitons in the WSe2 to give a 73 % change in transmission through the device. We demonstrate control of the propagating SPPs using both optical and SPP pumps, realizing a 2D semiconductor nonlinear plasmonic modulator, with an ultrafast response time of 290 fs.

Date: 2019
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DOI: 10.1038/s41467-019-11186-w

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