AC thermal imaging of a microwire with a fluorescent nanocrystal: influence of the near field on the thermal contrast

The temperature dependence of the visible fluorescence lines of large Pb[F.sub.2] nanocrystals codoped with [Er.sup.3+] and [Yb.sup.3+] ions is studied. The studies have shown that the fluorescence is affected both by the near-field optical distribution and by temperature variations.