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We show that axion-like particles that only couple to invisible dark photonscan generate visible B-mode signals around the reionization epoch. The axionfield starts rolling shortly before reionization, resulting in a tachyonicinstability for the dark photons. This generates an exponential growth of thedark photon quanta sourcing both scalar metric modes and gravitational wavesthat leave an imprint on the reionized baryons. The tensor modes modify thecosmic microwave background (CMB) polarization at reionization, generatingvisible B-mode signatures for the next generation of CMB experiments forparameter ranges that satisfy the current experimental constraints.

B-modes from Post-inflationary Gravitational Waves Sourced by Axionic Instabilities at Cosmic Reionization