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Strong coupling between magnon and electromagnetic wave can lead to theformation of a coupled spinphoton quasiparticle named as magnon-polariton. Thephenomenon is well studied for ferromagnetic systems inside microwave cavitiesin recent years. However, formation of magnon-polariton is rarely seen for anantiferromagnet (AFM) because the strong coupling condition is not easilyfulfilled. Here we present time-domain terahertz measurement on a multiferroicpolar antiferromagnet Fe2Mo3O8. We find clearly beating between two modes atfrequencies above and below the electric-active magnon frequency below TN,which we assign to the formation of AFM magnon-polariton. An ultra-strongspin-photon coupling effect is derived based on the energy level splitting.However, the AFM magnon-polariton is absent in the frequency domainmeasurement. Our work reveals that the coherent magnon formation driven by theultrashort THz pulse provides a new way to detect polariton mode splitting.

Revealing ultra-strong magnon-photon coupling in a polar antiferromagnet Fe2Mo3O8 by time domain terahertz spectroscopy