Poisson-Arago spot for gravitational waves

For the observer at infinity, a Schwarzschild black hole serves as an attractive opaque disk with radius of $$3\,\sqrt 3 M$$ that will produce diffraction pattern gravitational waves (GWs). In this study, we demonstrate bright spot, which is effect analogous to Poisson-Arago spot in optics, appear when ingoing (quasi-)plane GW diffracted by hole. Here, propose GWs described exact solution using Heun function. first time, Fresnel half-wave zone method proposed calculate angular part scattering stripes for infinity. The prospect observing discussed eikonal approximation. normal incidence (quasi)-plane 100 Hz (0.1 Hz) frequency central Milky Way, time delay between Earth bathed and minimum dark stripe 3.86 (3860) d. We witness second fringe (40% amplitude spot) after 6.2 (6200) This new involving early phase inspirals pulsars continuous wave sources potential scientific target future space-and ground-based detectors, respectively.