Nonlinear absorption and scattering of a single plasmonic nanostructure characterized by -scan technique.

Nonlinear nanoplasmonics is a largely unexplored research area that paves the way for many exciting applications, such as nanolasers, nanoantennas, and nanomodulators. In the field of nonlinear nanoplasmonics, it is highly desirable to characterize the nonlinearity of the optical absorption and scattering of single nanostructures. Currently, the common method to quantify optical nonlinearity is the -scan technique, which yields real and imaginary parts of the permittivity by moving a thin sample with a laser beam.