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. 2015 Feb 24;5:8568. doi: 10.1038/srep08568

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Imaginary parts of the scaled propagation constants β^(m)/k₀ pertaining to the supermodes of order m = 1 (empty markers) and m = 2 (full markers) of the compound profile in Eq. (16), for w = 2λ₀, (a) as a function of the normalized distance D (for |Im(Δε₁)| = 0.015), and (b) as a function of the non-Hermiticity parameter |Im(Δε₁)| (for D = 1.02).