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For more than four decades, mass of Abrikosov vortices defied experimental observations. We demonstrate a method of its detection in high-temperature superconductors. Similarly to electrons, fluxons circulate in the direction given by the magnetic field, causing circular dichroism. We report the magneto-transmittance of a nearly optimally doped thin YBa[Formula see text]Cu[Formula see text]O[Formula see text] film, measured using circularly polarized submillimeter waves. The circular dichroism emerges in the superconducting state and inc