Fig. 5.
Gradient-related term 𝒢0 provided by Eq. (26) as a function of α2 and for typical values of β. The dashed lines represent the extrapolation of this expression outside its derivation domain, that is, toward small values of α (i.e., for thick evanescent regions). The transition is arbitrarily assumed to occur when α2 ≲ 0.4, i.e., when Δr/2rev ≳ 0.2 according to Eq. (31).
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