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Observation of naturally canalized phonon polaritons in LiV2O5 thin layers
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Observation of naturally canalized phonon polaritons in LiV2O5 thin layers
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Journal Article
Observation of naturally canalized phonon polaritons in LiV2O5 thin layers
2024
Overview
Polariton canalization is characterized by intrinsic collimation of energy flow along a single crystalline axis. This optical phenomenon has been experimentally demonstrated at the nanoscale by stacking and twisting van der Waals (vdW) layers of α-MoO
3
, by combining α-MoO
3
and graphene, or by fabricating an h-BN metasurface. However, these material platforms have significant drawbacks, such as complex fabrication and high optical losses in the case of metasurfaces. Ideally, it would be possible to canalize polaritons “naturally” in a single pristine layer. Here, we theoretically predict and experimentally demonstrate naturally canalized phonon polaritons (PhPs) in a single thin layer of the vdW crystal LiV
2
O
5
. In addition to canalization, PhPs in LiV
2
O
5
exhibit strong field confinement (
λ
p
~
λ
0
27
), slow group velocity (0.0015c), and ultra-low losses (lifetimes of 2 ps). Our findings are promising for the implementation of low-loss optical nanodevices where strongly directional light propagation is needed, such as waveguides or optical routers.
Canalized polaritons are light-matter excitations characterized by intrinsic collimation of electromagnetic energy along a specific crystal axis. Here, the authors report the observation of intrinsically canalized phonon polaritons in a single thin layer of a van der Waals crystal, LiV
2
O
5
.
