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The Forster resonant energy transfer mechanism (FRET) is investigated inoptically driven and electrically gated tunnel coupled quantum dot molecules.Two novel FRET induced optical signatures are found in the dressed excitonicspectrum. This is constructed from exciton level occupation as function of pumplaser energy and applied bias, resembling a level anticrossing spectroscopymeasurement. We observe a redistribution of spectral weight and splitting ofthe exciton spectral lines. FRET among single excitons induces a splitting inthe spatially-direct exciton lines, away from the anticrossing due to chargetunneling in the molecule. However, near the anticrossing, a novel signatureappears as a weak satellite line following an indirect exciton line. FRETsignatures may also occur among indirect excitons, appearing as split indirectlines. In that case, the signatures appear also in the direct biexciton states,as the indirect satellite mixes in near the tunneling anticrossing region.

Forster energy transfer signatures in optically driven quantum dot molecules