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- Title
Observation of naturally canalized phonon polaritons in LiV<sub>2</sub>O<sub>5</sub> thin layers.
- Authors
F. Tresguerres-Mata, Ana I.; Lanza, Christian; Taboada-Gutiérrez, Javier; Matson, Joseph. R.; Álvarez-Pérez, Gonzalo; Isobe, Masahiko; Tarazaga Martín-Luengo, Aitana; Duan, Jiahua; Partel, Stefan; Vélez, María; Martín-Sánchez, Javier; Nikitin, Alexey Y.; Caldwell, Joshua D.; Alonso-González, Pablo
- Abstract
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-MoO3, by combining α-MoO3 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 LiV2O5. In addition to canalization, PhPs in LiV2O5 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, LiV2O5.
- Subjects
PHONONS; GROUP velocity; ELECTROMAGNETIC waves; OPTICAL waveguides; POLARITONS; LIGHT propagation; PHOTONIC crystal fibers
- Publication
Nature Communications, 2024, Vol 15, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-024-46935-z