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- W4308339660 abstract "Abstract Optical materials with nearly zero refractive indices have driven emerging applications ranging from geometry-invariant optical tunneling, nonlinear optics, optical cloaking to thermal emission manipulation. In conventional dielectric photonic circuits, light scattering and back reflection at the waveguide bends and crossings leads to significant optical loss. Here we propose to use near-zero-index materials as a cladding layer for low-loss optical waveguides, where optical modes are tightly confined within the dielectric core region. Compared to conventional waveguides, the near-zero-index waveguides are superior in maintaining a high mode-filling factor for small device sizes close to the diffraction limit and reducing the crosstalk in between at a sub-wavelength separation. In addition, we found that light propagation is robust to waveguide bends in a small radius (∼µm) and geometry variation in the cross section. Hollow waveguides with near-zero-index cladding layers further support low-loss light propagation because materials absorption is minimized from the air core. Our work offers critical insights into future designs of low-loss and miniaturized photonic devices." @default.
- W4308339660 created "2022-11-11" @default.
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- W4308339660 date "2022-11-07" @default.
- W4308339660 modified "2023-10-18" @default.
- W4308339660 title "Low-loss, geometry-invariant optical waveguides with near-zero-index materials" @default.
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- W4308339660 doi "https://doi.org/10.1515/nanoph-2022-0445" @default.
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