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- W3111232143 abstract "Abstract Light is confined transversely and delivered axially in a waveguide. However, waveguides are lossy static structures whose modal characteristics are fundamentally determined by their boundary conditions. Here we show that unpatterned planar waveguides can provide low-loss two-dimensional waveguiding by using space-time wave packets, which are unique one-dimensional propagation-invariant pulsed optical beams. We observe hybrid guided space-time modes that are index-guided in one transverse dimension and localized along the unbounded dimension. We confirm that these fields enable overriding the boundary conditions by varying post-fabrication the group index of the fundamental mode in a 2-μm-thick, 25-mm-long silica film, achieved by modifying the field’s spatio-temporal structure. Tunability of the group index over an unprecedented range from 1.26 to 1.77 is verified while maintaining a spectrally flat zero-dispersion profile. Our work paves the way to utilizing space-time wave packets in on-chip platforms, and enable phase-matching strategies that circumvent restrictions due to intrinsic material properties." @default.
- W3111232143 created "2020-12-21" @default.
- W3111232143 creator A5006550826 @default.
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- W3111232143 creator A5042564747 @default.
- W3111232143 creator A5070094442 @default.
- W3111232143 creator A5077694862 @default.
- W3111232143 date "2020-12-08" @default.
- W3111232143 modified "2023-09-27" @default.
- W3111232143 title "Hybrid guided space-time optical modes in unpatterned films" @default.
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- W3111232143 doi "https://doi.org/10.1038/s41467-020-20009-2" @default.
- W3111232143 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7722861" @default.
- W3111232143 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/33293548" @default.
- W3111232143 hasPublicationYear "2020" @default.
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