The experimental data were taken in the NanoPhotonics Group at the Cavendish Laboratory (University of Cambridge). The dataset is for the journal article, "Nanoscopy through a plasmonic nano-lens". Images and spectra were taken using a monochromator (Andor Shamrock SR-303i), equipped with an electron-multiplying CCD camera (Andor Newton 970 EMCCD). For a description of the setup and data collection methods, see the "Methods" section of the manuscript. We acknowledge EPSRC grants EP/N016920/1, EP/L027151/1, and NanoDTC EP/L015978/1. OSO acknowledges support of Rubicon fellowship from the Netherlands Organisation for Scientific Research, and RC thanks support from Trinity College Cambridge.