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In this paper, we investigate the possibility of detecting lensing signals in high‐resolution and high‐sensitivity cosmic microwave background (CMB) experiments. At scales below 1 arcmin, the CMB background is dominated by the Sunyaev–Zel'dovich effect in clusters and by Ostriker–Vishniac effect distortions elsewhere. This uniform signal can be used as a background for lensing studies potentially allowing the detection of high‐redshift clusters with none or little Sunyaev–Zel'dovich effect signal. We focus on the Ostriker–Vishniac effect and study the possibility of the detection of the lensing signatures by high‐redshift clusters. We pay special attention to contaminants, such as instrumental noise and point sources. After designing an optimal filter for this particular lensing signal, we explore the signal‐to‐noise ratio for different scenarios varying the resolution of the experiment, its sensitivity and the level of contamination due to point sources. Our results show that the next generation of experiments should be able to introduce new and exciting science through the study of the Ostriker–Vishniac effect and its lensing effect.

Observing high‐redshift galaxy clusters through lensing of the Ostriker–Vishniac effect