Nonlinear Hall effect as a local probe of plasmonic magnetic hot spots

Recently developed plasmonic nanostructures are able to generate intense and localized magnetic hot spots in a large spectral range from the terahertz visible. However, direct measurement of field at spot has not been performed yet, due absence detectors that work those high frequencies fit hot-spot area. We propose place graphene ribbon nanostructure driven by laser beam, such current is generated both electric laser. demonstrate nonlinear Hall voltage, which can be measured standard electrical means, builds up across ribbon, making it possible directly probe spot.