期刊
SCIENCE ADVANCES
卷 7, 期 14, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abf2690
关键词
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资金
- government of the Principality of Asturias [PA20-PF-BP19-053, PA-18-PF-BP17-126]
- Ministry of Science and Higher Education of the Russian Federation [0714-2020-0002]
- Ramon y Cajal Program from the government of Spain
- FSE [RYC2018-026196-I]
- Spanish Ministry of Science, Innovation and Universities [MAT201788358-C3-3-R]
- Basque Department of Education [PIBA-2020-1-0014]
- European Research Council [715496]
The study demonstrates that polaritons in van der Waals crystals can be directed along forbidden directions by inducing an optical topological transition. Additionally, exotic polaritonic states between mutually orthogonal hyperbolic regimes were observed in the experiment.
Polaritons with directional in-plane propagation and ultralow losses in van der Waals (vdW) crystals promise unprecedented manipulation of light at the nanoscale. However, these polaritons present a crucial limitation: their directional propagation is intrinsically determined by the crystal structure of the host material, imposing forbidden directions of propagation. Here, we demonstrate that directional polaritons (in-plane hyperbolic phonon polaritons) in a vdW crystal (alpha-phase molybdenum trioxide) can be directed along forbidden directions by inducing an optical topological transition, which emerges when the slab is placed on a substrate with a given negative permittivity (4H-silicon carbide). By visualizing the transition in real space, we observe exotic polaritonic states between mutually orthogonal hyperbolic regimes, which unveil the topological origin of the transition: a gap opening in the dispersion. This work provides insights into optical topological transitions in vdW crystals, which introduce a route to direct light at the nanoscale.
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