“Digitally” addressable and localized on a nanometer-sized scale laser light spot

We propose and experimentally realize sub-wavelength light localization based on optical nonlinearity of a single nonlinear-element in nanoplasmonics - a split hole resonator (SHR). Here, we demonstrate the use of the SHR as a highly efficient nonlinear optical element for: (1) the generation of the third harmonic from a single SHR; (2) the excitation of intense multiphoton luminescence from a single SHR; (3) the realization of a polarization-ultrasensitive nanoelement; and finally, as a practical application, (4) the building up of an all-optical display.