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Microfocused Brillouin light scattering (BLS) and microwave absorption (MA)are used to study magnon-photon coupling in a system consisting of a split-ringmicrowave resonator and a yttrium iron garnet (YIG) film. The split-ringresonantor is defined by optical lithography and loaded with a 1 $\mu$m-thickYIG film grown by liquid phase epitaxy. BLS and MA spectra of the hybrid systemare simultaneously recorded as a function of the applied magnetic fieldmagnitude and microwave excitation frequency. Strong coupling of the magnon andphoton modes is found with a coupling strength of $g_\text{eff}/2 \pi = 63$MHz. The combined BLS and MA data allows to study the continuous transition ofthe hybridized modes from a purely magnonic to a purely photonic mode byvarying the applied magnetic field and microwave frequency. Furthermore, theBLS data represent an up-conversion of the microwave frequency coupling tooptical frequencies.

Combined Brillouin light scattering and microwave absorption study of magnon-photon coupling in a split-ring resonator/YIG film system