Ultralow-Loss Phonon Polaritons in the Isotope-Enriched α-MoO<sub>3</sub>.
basic_science · Level V
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- Record sourced from PubMed, PMID 36343338.
- Also identified by DOI 10.1021/acs.nanolett.2c03742.
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Abstract
α-MoO<sub>3</sub>, a natural van der Waals (vdWs) material, has received wide attention in nano-optics for supporting highly confined anisotropic phonon polaritons (PhPs) from the mid-infrared to the terahertz region, which opens a new route for manipulating light at the nanoscale. However, its optical loss hinders light manipulation with high efficiency. This work demonstrates that the isotope-enriched Mo element enables ultralow-loss PhPs in the α-MoO<sub>3</sub>. Raman spectra reveal that the isotope-enriched Mo element in the α-MoO<sub>3</sub> allows different optical phonon frequencies by efficiently altering the Reststrahlen band's dispersion. The Mo isotope-enriched α-MoO<sub>3</sub> significantly reduces the PhPs' optical loss due to efficient optical coherence, which enhances the propagation length revealed by infrared nanoimaging. These findings suggest that the isotope-enriched α-MoO<sub>3</sub> is a new feasible 2D material with an ultralow optical loss for possible high-performance integrated photonics and quantum optics devices.