correction the authors of the letter "complete optical isolation created by indirect interband photonic transitions" in nature photonics 3, 91–94 (2009) wish to correct equation (4). the corrected equation is provided. this correction also affects the final sentence in the third paragraph from the end of page 92, which should now read "for this device, our calculation indicates that over a frequency bandwidth of 1.2 thz, the contrast ratio between forward and backward transmission coefficients is above 40 db." these errors have been corrected in the html and pdf versions of the letter. the corrected equation is: a₁(z) = e^{-izΔk/2} [cos(z√(c² + (Δk/2)²)) + i(Δk/2)/√(c² + (Δk/2)²) sin(z√(c² + (Δk/2)²))] a₂(z) = i e^{i zΔk/2} [c sin(z√(c² + (Δk/2)²)) / √(c² + (Δk/2)²)]correction the authors of the letter "complete optical isolation created by indirect interband photonic transitions" in nature photonics 3, 91–94 (2009) wish to correct equation (4). the corrected equation is provided. this correction also affects the final sentence in the third paragraph from the end of page 92, which should now read "for this device, our calculation indicates that over a frequency bandwidth of 1.2 thz, the contrast ratio between forward and backward transmission coefficients is above 40 db." these errors have been corrected in the html and pdf versions of the letter. the corrected equation is: a₁(z) = e^{-izΔk/2} [cos(z√(c² + (Δk/2)²)) + i(Δk/2)/√(c² + (Δk/2)²) sin(z√(c² + (Δk/2)²))] a₂(z) = i e^{i zΔk/2} [c sin(z√(c² + (Δk/2)²)) / √(c² + (Δk/2)²)]