Fabry–Pérot-type enhancement in plasmonic visible nanosource
Abstract
Starting from thin film planar technology, we designed and fabricated a visible optical source that
produces a localized bright spot with nanometric dimensions. The structure consists of exciting
surface plasmons through the illumination of a subwavelength hole in a silver film and in confining
them at the vicinity of the aperture by surrounding the hole of Bragg mirrors resonant with the
plasmons generated. Both finite element method computations and experimental results evidence the
performances of this device that could find applications, for example, in nanolithography or optical
data storage.