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We study arrays of silver split-ring resonators operating at around1.5-{\mu}m wavelength coupled to an MBE-grown single 12.7-nm thin InGaAsquantum well separated only 4.8 nm from the wafer surface. The samples are heldat liquid-helium temperature and are pumped by intense femtosecond opticalpulses at 0.81-{\mu}m center wavelength in a pump-probe geometry. We observemuch larger relative transmittance changes (up to about 8%) on thesplit-ring-resonator arrays as compared to the bare quantum well (not more than1-2%). We also observe a much more rapid temporal decay component of thedifferential transmittance signal of 15 ps for the case of split-ringresonators coupled to the quantum well compared to the case of the bare quantumwell, where we find about 0.7 ns. The latter observation is ascribed to thePurcell effect that arises from the evanescent coupling of the split-ringresonators to the quantum-well gain. All experimental results are compared witha recently introduced analytical toy model that accounts for this evanescentcoupling, leading to excellent overall qualitative agreement.

Arrays of Ag split-ring resonators coupled to InGaAs single-quantum-well gain