Journal
NATURE MATERIALS
Volume 19, Issue 9, Pages 964-+Publisher
NATURE RESEARCH
DOI: 10.1038/s41563-020-0665-0
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Funding
- Severo Ochoa Program from the Government of the Principality of Asturias [PA-18-PF-BP17-126, PA-20-PF-BP19-053]
- Clarin Programme from the Government of the Principality of Asturias
- Marie Curie-COFUND grant [PA-18-ACB17-29]
- Ramon y Cajal Program from the Government of Spain [RYC2018-026196-I]
- Air Force Office of Scientific Research (AFOSR) [FA 9550-18-1-0030]
- Spanish Ministry of Economy and Competitiveness [FIS2016-76617-P]
- Spanish Ministry of Science, Innovation and Universities [MAT2017-88358-C3-3-R]
- Basque Government [IT1164-19]
- Australian Research Council [FT150100450, IH150100006, CE170100039]
- Spanish Ministry of Economy, Industry, and Competitiveness [RTI2018-094830-B-100]
- Spanish Ministry of Economy, Industry, and Competitiveness (Maria de Maeztu Units of Excellence Program) [MDM-2016-0618]
- Basque Goverment [IT1164-19]
- European Research Council [715496]
- Australian Research Council [FT150100450] Funding Source: Australian Research Council
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The spectral range of long-lived and confined phonon polaritons in a polar van der Waals crystal is shown to be tunable by intercalation of Na atoms, expanding their potential for nanophotonic applications in the mid-infrared domain. Phonon polaritons-light coupled to lattice vibrations-in polar van der Waals crystals are promising candidates for controlling the flow of energy on the nanoscale due to their strong field confinement, anisotropic propagation and ultra-long lifetime in the picosecond range(1-5). However, the lack of tunability of their narrow and material-specific spectral range-the Reststrahlen band-severely limits their technological implementation. Here, we demonstrate that intercalation of Na atoms in the van der Waals semiconductor alpha-V2O5 enables a broad spectral shift of Reststrahlen bands, and that the phonon polaritons excited show ultra-low losses (lifetime of 4 +/- 1 ps), similar to phonon polaritons in a non-intercalated crystal (lifetime of 6 +/- 1 ps). We expect our intercalation method to be applicable to other van der Waals crystals, opening the door for the use of phonon polaritons in broad spectral bands in the mid-infrared domain.
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