On reconstruction from imaginary part for radiation solutions in two dimensionsWe consider a radiation solution $ψ$ for the Helmholtz equation in an exterior region in $\mathbb R^2$. We show that $ψ$ in the exterior region is uniquely determined by its imaginary part $Im(ψ)$ on an interval of a line $L$ lying in the exterior region. This result has holographic prototype in the recent work [Nair, Novikov, arXiv:2408.08326]. Some other curves for measurements instead of the lines $L$ are also considered. Applications to the Gelfand-Krein-Levitan inverse problem and passive imaging are also indicated.
arXiv.org 
