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We consider Z2 spin liquids on the kagome lattice on the verge of a valencebond solid (VBS) transition, where vortex excitations carrying Z2 magnetic flux- so-called visons - condense. We show that these vison excitations can coupledirectly to the external electromagnetic field, even though they carry neitherspin nor charge. This is possible via a magneto-elastic coupling mechanismrecently identified by Potter et al and Hao. For the case of transitions to a36-site unit cell VBS state the corresponding finite ac-conductivity has aspecific power law frequency dependence, which is related to the crossoverexponent of the quantum critical point. The visons' contribution to the opticalconductivity at transitions to VBS states with a 12-site unit cell vanishes,however.

Optical conductivity of visons in Z2 spin liquids close to a VBS transition on the kagome lattice