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We performed combined infrared reflection and ellipsometry measurements ofthe in-plane optical reponse of single crystals of the pnictide hightemperature superconductor BaFe$_{1.87}$Co$_{0.13}$As$_{2}$ with $T_{c}$ = 24.5K. We observed characteristic superconductivity-induced changes which provideevidence for at least three different energy gaps. We show that a BCS-model ofisotropic gaps with 2$\Delta/k_{B}T_{c}$ of 3.1, 4.7, and 9.2 reproduces theexperimental data rather well. We also determine the low-temperature value ofthe in-plane magnetic penetration depth of 270 nm.

Evidence for multiple superconducting gaps in optimally doped BaFe$_{1.87}$Co$_{0.13}$As$_{2}$ from infrared spectroscopy