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Motivated by recent experimental findings for an organic superconductor,charge oscillations that emerge after a strong pulse of an oscillating electricfield is applied are studied in electron systems in a superconducting phase ona lattice with a dimerized structure. They are analyzed using Fourier spectraof charge densities whose time profiles are obtained by numerically solving thetime-dependent Schr\"odinger equation within a mean-field approximation.Depending on the strengths of attractive interactions, differentcharge-oscillation modes appear. For weak attractions, the charge-oscillationmode is an electronic breathing mode, which was previously found for repulsiveinteractions. For strong attractions, it is a pair analog of the electronicbreathing mode (a `pair' breathing mode). For intermediate attractions, it isanother mode whose transient current distributions are considerably differentfrom those of the breathing modes. We investigate how their frequencies andamplitudes depend on interactions and transfer integrals.

Charge Oscillations Emerging after Application of an Intense Light Field to Superconductors on a Dimer Lattice