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Abstract
We present a correction to Eq. (42) in Adv. Opt. Photon. 12, 612 (2020) [CrossRef] .
© 2021 Optica Publishing Group
Equation (42) of Ref. [1] has a sign-error in the second term as well as a missing “‡” on the left hand side. The correct equation is
$$\begin{split}\langle \langle
{\underline {\tilde {\textbf F}} _m^{{\ddagger}}({\textbf r})|{{\underline
{\tilde {\textbf F}}}_m}({\textbf r})} \rangle \rangle &=
\frac{1}{{2{\epsilon _0}}}\int_V {{\epsilon _0}{\epsilon _{\rm
r}}({\textbf r}){{\tilde {\textbf f}}_m}({\textbf r}) \cdot {{\tilde
{\textbf f}}_m}({\textbf r}) - {\mu _0}{{\tilde {\textbf g}}_m}({\textbf
r}) \cdot {{\tilde {\textbf g}}_m}({\textbf r}){\rm d}V} \\ &\quad+
\frac{\rm i}{{2{\epsilon _0}{{\tilde \omega}_m}}}\int_{\partial V}
{[{{{\tilde {\textbf f}}_m}({\textbf r}) \times [r{\partial _r}{{\tilde
{{\textbf g}}}_m}({\textbf r})] - [r{\partial _r}{{\tilde {\textbf
f}}_m}({\textbf r})] \times {{\tilde {\textbf g}}_m}({\textbf r})}] \cdot
\hat {\textbf n}\,{\rm d}A.} \end{split}$$
The error does not impact other results or calculations in Ref. [1].
References
1. P. T. Kristensen, K. Herrmann, F. Intravaia, and K. Busch, “Modeling electromagnetic resonators using quasinormal modes,” Adv. Opt. Photon. 12, 612–708 (2020). [CrossRef]