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

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Advanced Materials, articlenumber 1907105
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.
| openaire: EC/H2020/820423/EU//S2QUIP | openaire: EC/H2020/834742/EU//ATOP
2D materials, all-optical plasmonic modulators, graphene plasmon, van der Waals heterostructures
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Guo, X, Liu, R, Hu, D, Hu, H, Wei, Z, Wang, R, Dai, Y, Cheng, Y, Chen, K, Liu, K, Zhang, G, Zhu, X, Sun, Z, Yang, X & Dai, Q 2020, ' Efficient All-Optical Plasmonic Modulators with Atomically Thin Van Der Waals Heterostructures ', Advanced Materials, vol. 32, no. 11, 1907105 . https://doi.org/10.1002/adma.201907105