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(a) The NbN absorptance normalized by the fill-factor in p-periodic SNSPD designs. (b) Wavelength dependent absorptance at the orientations in different SNSPD designs indicated in (a). The NbN absorptance as a function of φ polar angle and λ wavelength in 220-nm-pitch (c) NCAI-SNSPD and (d) NCDAI-SNSPD design.
