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Diffraction gratings based on multilayer silicon nitride wa..:

Wen-ling Li (14411565) ; Jing-wei Liu (419646) ; Guo-an Cheng (1948282)...
https://figshare.com/articles/preprint/Diffraction_gratings_based_on_multilayer_silicon_nitride_waveguide_with_high_upward_efficiency_and_large_effective_length/21884247.  , 2021