Shaping plasmon beams via the controlled illumination of finite-size plasmonic crystals.

ABSTRACT: Plasmonic crystals provide many passive and active optical functionalities, including enhanced sensing, optical nonlinearities, light extraction from LEDs and coupling to and from subwavelength waveguides. Here we study, both experimentally and numerically, the coherent control of SPP beam excitation in finite size plasmonic crystals under focussed illumination. The correct combination of the illuminating spot size, its position relative to the plasmonic crystal, wavelength and polarisation enables the efficient shaping and directionality of SPP beam launching. We show that under strongly focussed illumination, the illuminated part of the crystal acts as an antenna, launching surface plasmon waves which are subsequently filtered by the surrounding periodic lattice. Changing the illuminatio

SUBMITTER: Bouillard JS 

PROVIDER: S-EPMC4246211 | biostudies-literature | 2014 Nov

REPOSITORIES: biostudies-literature