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The absorption process of an emitter close to a plasmonic antenna is enhanceddue to strong local electromagnetic (EM) fields. The emission process, ifresonant with the plasmonic system, re-radiates to the far-field by couplingwith the antenna due to the availability of plasmonic states. This increasesthe local density of states (LDOS), effectively providing more, or alternate,pathways for emission. Through the mapping of localized emission events fromsingle molecules close to plasmonic antennas, performed using far-field data,one gains combined information on both the local EM field strength and the LDOSavailable. The localization from these emission-coupled events generally donot, therefore, report the real position of the molecules, nor the EMenhancement distribution at the illuminating wavelength. Here we propose theuse of a large Stokes shift fluorescent molecule in order to spectrallydecouple the emission process of the dye from the plasmonic system, leavingonly the absorption strongly in resonance with the enhanced EM field in theantennas vicinity. We show that the real position of the emitters in thiscomplex, but interesting, scenario can be found directly. Moreover, wedemonstrate that this technique provides an effective way of exploring eitherthe EM field or the LDOS with nanometre spatial resolution.

Decoupling absorption and emission processes in super-resolution localization of emitters in a plasmonic hotspot