 We have developed a new approach to study collective excitations in superfluids composed of charged particles. Our method combines path integral techniques for superfluids and Coulomb gases, allowing us to extend the Gaussian fluctuation approximation to include plasmonic modes. This allows us to accurately describe all branches of collective excitations present in a charged superfluid. We find that these modes interact with each other, resulting in a resonance phenomenon which can be used to detect the presence of the pair, breaking modes. This article was authored by S. N. Clement, J. Tempere, T. Rappelinger, and others.