Enhanced confined light transmission by single subwavelength apertures in metallic films

Abstract

The diffraction of light that emerges from a metallic circular aperture is studied. Near- and far-field results are presented. Spectral angular transmitted intensities are performed versus the incident wavelength for four kinds of aperture. It is shown that, for a definite configuration, a large enhancement of transmission--compared with the basic case of a single hole--occurs combined with a spectacular angular confinement of light. Such effects are, for example, of great interest in optical near-field microscopy for which the probe is a nanosource.

Small-divergence semiconductor lasers by plasmonic collimation

“…There have been subsequent theoretical and experimental studies of this aperture -groove structure [10][11][12][13][14] , but there have been very few attempts to integrate this structure into an active device [15][16][17] .…”

Resonant excitation of surface plasmons in one-dimensional metallic grating structures at microwave frequencies

“…Afterwards, many theoretical and experimental studies on EOT through subwavelength apertures (holes or slits) proved that this phenomenon was due to resonant excitation of SPs. 1D [4][5][6][7][8][9][10][11][12] and 2D [13][14][15][16][17][18][19] periodic surface corrugations were implemented in these studies. The optical beaming property of subwavelength apertures in metallic grating structures was reported [9].…”

Giant Optical Transmission of a Subwavelength Slit Optimized Using the Magnetic Field Phase

“…Further modifications of the original configuration have been studied. For example, grooves have been introduced on the exit surface to obtain more collimated beams of transmitted light [7][8][9]. The transmission enhancement of all suggested patterns is moderate, however.…”