Far-field to near-field investigation of thermal radiation emitted by a single optical nanoantenna

摘要

Nanoantennas have the ability to spatially and spectrally manipulate light at the nanoscale. Arranged in arrays, they create metasurfaces with homogeneous optical properties but periodicity and coupling between nanoantennas can be detrimental to the study of their intrinsic optical response. In order to investigate the electromagnetic properties of a single nanoantenna, we use a set-up based on thermal radiation scanning tunneling microscopy (TRSTM) to characterize an isolated nanoantenna from the near field to the far field by achieving sub-wavelength imaging in the mid-infrared.