Figure 5.

NbN absorptance depicted as a function of wavelength and polar angle and the dispersion diagram in p-pitch and P-pitch (aa,ae,ba,be) NCAI-SNSPD; (ab,af,bb,bf) NCDAI-SNSPD, (ac,ag,bc,bg) NCDDAI-SNSPD, and (ad,ah,bd,bh) NCTAI-SNSPD illuminated by p-polarized light. Comparison of the wavelength dependent NbN absorptance of different (a) p-pitch and (b) P-pitch designs at the extrema in polar angle in p-onto-S configuration, which are of potential interest to practical applications. Those NbN absorptance extrema, which are of the same type in polar angle and wavelength, are indicated analogously on both graphs (M, V, WR, M*, V*, WR* points).