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Edge-oriented and steerable hyperbolic polaritons in anisotropic van der Waals nanocavities

Author

Listed:
  • Zhigao Dai

    (China University of Geosciences
    Monash University)

  • Guangwei Hu

    (National University of Singapore
    City University of New York)

  • Guangyuan Si

    (Northeastern University)

  • Qingdong Ou

    (Monash University)

  • Qing Zhang

    (National University of Singapore)

  • Sivacarendran Balendhran

    (The University of Melbourne)

  • Fahmida Rahman

    (RMIT University)

  • Bao Yue Zhang

    (RMIT University)

  • Jian Zhen Ou

    (RMIT University)

  • Guogang Li

    (China University of Geosciences)

  • Andrea Alù

    (City University of New York
    City University of New York)

  • Cheng-Wei Qiu

    (National University of Singapore)

  • Qiaoliang Bao

    (Monash University
    The Hong Kong Polytechnic University, Hung Hom, Kowloon)

Abstract

Highly confined and low-loss polaritons are known to propagate isotropically over graphene and hexagonal boron nitride in the plane, leaving limited degrees of freedom in manipulating light at the nanoscale. The emerging family of biaxial van der Waals materials, such as α-MoO3 and V2O5, support exotic polariton propagation, as their auxiliary optical axis is in the plane. Here, exploiting this strong in-plane anisotropy, we report edge-tailored hyperbolic polaritons in patterned α-MoO3 nanocavities via real-space nanoimaging. We find that the angle between the edge orientation and the crystallographic direction significantly affects the optical response, and can serve as a key tuning parameter in tailoring the polaritonic patterns. By shaping α-MoO3 nanocavities with different geometries, we observe edge-oriented and steerable hyperbolic polaritons as well as forbidden zones where the polaritons detour. The lifetime and figure of merit of the hyperbolic polaritons can be regulated by the edge aspect ratio of nanocavity.

Suggested Citation

  • Zhigao Dai & Guangwei Hu & Guangyuan Si & Qingdong Ou & Qing Zhang & Sivacarendran Balendhran & Fahmida Rahman & Bao Yue Zhang & Jian Zhen Ou & Guogang Li & Andrea Alù & Cheng-Wei Qiu & Qiaoliang Bao, 2020. "Edge-oriented and steerable hyperbolic polaritons in anisotropic van der Waals nanocavities," Nature Communications, Nature, vol. 11(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-19913-4
    DOI: 10.1038/s41467-020-19913-4
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    Cited by:

    1. Jiangtao Lv & Yingjie Wu & Jingying Liu & Youning Gong & Guangyuan Si & Guangwei Hu & Qing Zhang & Yupeng Zhang & Jian-Xin Tang & Michael S. Fuhrer & Hongsheng Chen & Stefan A. Maier & Cheng-Wei Qiu &, 2023. "Hyperbolic polaritonic crystals with configurable low-symmetry Bloch modes," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    2. Neda Alsadat Aghamiri & Guangwei Hu & Alireza Fali & Zhen Zhang & Jiahan Li & Sivacarendran Balendhran & Sumeet Walia & Sharath Sriram & James H. Edgar & Shriram Ramanathan & Andrea Alù & Yohannes Aba, 2022. "Reconfigurable hyperbolic polaritonics with correlated oxide metasurfaces," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    3. Joseph Matson & Sören Wasserroth & Xiang Ni & Maximilian Obst & Katja Diaz-Granados & Giulia Carini & Enrico Maria Renzi & Emanuele Galiffi & Thomas G. Folland & Lukas M. Eng & J. Michael Klopf & Stef, 2023. "Controlling the propagation asymmetry of hyperbolic shear polaritons in beta-gallium oxide," Nature Communications, Nature, vol. 14(1), pages 1-8, December.

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