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We show that superconducting interlayer coupling, which coexists with and isdepressed by stripe order in La1.885Ba0.115CuO4, can be enhanced by excitationwith near-infrared laser pulses. For temperatures lower than Tc = 13 K, weobserve a blue-shift of the equilibrium Josephson plasma resonance, detected byterahertz-frequency reflectivity measurements. Key to this measurement is theability to probe the optical properties at frequencies as low as 150 GHz,detecting the weak interlayer coupling strengths. For T > Tc a similar plasmaresonance, absent at equilibrium, is induced up to the spin-orderingtemperature TSO = 40 K. These effects are reminiscent but qualitativelydifferent from the light-induced superconductivity observed by resonant phononexcitation in La1.675Eu0.2Sr0.125CuO6.5. Importantly, enhancement of thebelow-Tc interlayer coupling and its appearance above Tc are preferentiallyachieved when the near-infrared pump light is polarized perpendicular to thesuperconducting planes, likely due to more effective melting of stripe orderand the less effective excitation of quasiparticles from the Cooper paircondensate when compared to in-plane excitation.

Optically induced superconductivity in striped La2-xBaxCuO4 by polarization-selective excitation in the near infrared