Abstract:
A system (10) for optical processing based on light-controlled photon tunneling is provided. The system (10) includes a prism (12) having a metallic film layer (14) formed on an upper surface thereof. The metallic film layer (14) has a microscopic aperture (18) formed therethrough and the microscopic aperture (18) is covered by a layer of non-linear optical film. A first light beam (30) is projected towards aperture (18) and photons from first light beam (30) tunnel through aperture (18). A second light beam (32) is also projected towards microscopic aperture (18), with the second light beam (32) having a different wavelength than that of light beam (30). Selective actuation and modulation of light beam (32) allows for selective control over the rate and intensity of the photons which tunnel through microscopic aperture (18). The intensity of transmission of the photons from light beam (30) are measured by optical fiber tip (22), thus allowing for the creation of optical gates, switches, and other optical processing devices.
Abstract:
A plasmonic coupling device (1) comprising a first structure (2), and a second structure (3) comprising two or more conductive nanoparticles (7), wherein each nanoparticle is elongate and is attached to the first structure such that it is oriented with a major axis thereof substantially perpendicular to the first structure. In a plasmonic coupling device comprising such nanoparticles, radiation incident on the device can produce localised surface plasmons in the nanoparticles. The localised surface plasmons can become deiocalised along the device, due to the near-field electromagnetic interaction between the two or more nanoparticles or between the one or more nanoparticles of an assembly and a nearby assembly or assemblies. This interaction allows for electro-magnetic energy, and the radiation, to be efficiently coupled between the nanoparticles or between the assemblies of one or more nanoparticles.