Efficient All-Optical Plasmonic Modulators with Atomically Thin Van Der Waals Heterostructures

Xiangdong Guo, Ruina Liu, Debo Hu, Hai Hu, Zheng Wei, Rui Wang, Yunyun Dai, Yang Cheng, Ke Chen, Kaihui Liu, Guangyu Zhang, Xing Zhu, Zhipei Sun*, Xiaoxia Yang, Qing Dai

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

All-optical modulators are attracting significant attention due to their intrinsic perspective on high-speed, low-loss, and broadband performance, which are promising to replace their electrical counterparts for future information communication technology. However, high-power consumption and large footprint remain obstacles for the prevailing nonlinear optical methods due to the weak photon–photon interaction. Here, efficient all-optical mid-infrared plasmonic waveguide and free-space modulators in atomically thin graphene-MoS2 heterostructures based on the ultrafast and efficient doping of graphene with the photogenerated carrier in the monolayer MoS2 are reported. Plasmonic modulation of 44 cm−1 is demonstrated by an LED with light intensity down to 0.15 mW cm−2, which is four orders of magnitude smaller than the prevailing graphene nonlinear all-optical modulators (≈103 mW cm−2). The ultrafast carrier transfer and recombination time of photogenerated carriers in the heterostructure may achieve ultrafast modulation of the graphene plasmon. The demonstration of the efficient all-optical mid-infrared plasmonic modulators, with chip-scale integrability and deep-sub wavelength light field confinement derived from the van der Waals heterostructures, may be an important step toward on-chip all-optical devices.

Original languageEnglish
Article number1907105
JournalAdvanced Materials
DOIs
Publication statusE-pub ahead of print - 1 Jan 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • 2D materials
  • all-optical plasmonic modulators
  • graphene plasmon
  • van der Waals heterostructures

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