We propose and experimentally realize a far-field imaging technique, polarization spectro-tomography, capable of detecting small resonant objects (quantum dots, plasmonic nanorods) on the surface of a plasmonic nanosphere. The technique is based on Fano interference.

We propose and experimentally realize a “plasmonic protractor”: a spectroscopic device capable of detecting the orientation, position, and length of a small optically dark object using the polarization-resolved dark field microscopy.