Klein Matthew, Badada Bekele H, Binder Rolf, Alfrey Adam, McKie Max, Koehler Michael R, Mandrus David G, Taniguchi Takashi, Watanabe Kenji, LeRoy Brian J, Schaibley John R
Department of Physics, University of Arizona, Tucson, AZ, 85721, USA.
College of Optical Sciences, University of Arizona, Tucson, AZ, 85721, USA.
Nat Commun. 2019 Jul 22;10(1):3264. doi: 10.1038/s41467-019-11186-w.
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 WSe 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 WSe 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.
表面等离子体调制器是一种控制传播的表面等离子体的振幅或相位的器件。在纯表面等离子体调制器中，表面等离子体泵浦波的存在与否通过一个通道控制表面等离子体探测波的振幅。这种控制必须由不同表面等离子体波之间的相互作用介导，通常需要集成非线性材料。在这项工作中，我们展示了一种基于集成在光刻定义的金属波导顶部的WSe₂单层的二维半导体非线性表面等离子体调制器。我们利用WSe₂中表面等离子体激元（SPP）与激子之间的强相互作用，使通过该器件的透射率发生73%的变化。我们展示了使用光泵浦和表面等离子体泵浦对传播的表面等离子体激元的控制，实现了一种二维半导体非线性表面等离子体调制器，其超快响应时间为290 fs。
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