Enhancement of Extraordinary Optical Transmission in a Double Heterostructure Plasmonic Bandgap Cavity

Abstract

In this paper, a novel plasmonic bandgap cavity inducing the enhancement of extraordinary optical transmission is presented. Numerical simulations have been performed to model a free-standing structure made of a one-dimensional periodic arrangement of gold strips. Two different values of the lattice constant have been properly chosen to realize a double heterostructure-like cavity to accomplish extraordinary optical transmission assisted by the formation of a plasmonic bandgap in the adjacent regions. Numerical results prove the capability of this optical device to efficiently transmit input light beams with far-field transmission values close to 100% due to the excitation of surface plasmon polariton resonant modes.

Plasmonic Bandgaps in 1D Arrays of Slits on Metal Layers Excited by Out-of-Plane Sources

“…Table 1 Table 1: Resonant wavelengths corresponding to the excitation of the SPP modes over the air-metal interface of the array of gold stripes with p = 700 nm and corresponding parameters for the equivalent structures. reports the resonant wavelengths of the SPP modes of the first order for the cases already presented in Figure 5 and the equivalent parameters obtained by the application of (6) and (7). The application of these parameters to the equivalent structure allows the comparison of spectra with those already exposed in Figure 5.…”

“…Nevertheless, it only has a physical meaning for values of λ close to that one assumed by λ − res, m (θ) for a particular θ value. Moreover, the formulations (6) and (7) do not include the metal thickness, since it does not alter considerably the SPP resonance over the grating when the thickness itself is much larger than the skin depth of metal, that is, as in the presented cases.…”

“…Surface plasmons show unique properties when they propagate over metal gratings and interact with free waves in the dielectric surroundings. The results of the fundamental research in the area of plasmonics have demonstrated that SPPs and LSPs can be exploited for many potential applications residing in sensing [1][2][3][4][5], light manipulation [6,7] and emission [8][9][10], energy conversion [11][12][13], and optical nanoantennas [14,15], just to mention a few.…”

Optical Curtain Effect: Extraordinary Optical Transmission Enhanced by Antireflection

“…Studies on shaping the metallic nanoslits are on-going [29,30]. Some complex structures, such as double layered metallic nanoslit array have also been investigated [31,32] In our previous work [35], it is reported that light coming out of a metallic nanoslit array can generate a unique optical curtain effect, i.e., the formation of a spatially invariant field distribution in the output region. Based on the physical model in the wave-vector domain, it is known that the optical curtain effect is actually the superposition of two diffracting plane waves ( 1 ± orders).…”

“…Studies on shaping the metallic nanoslits are on-going [29,30]. Some complex structures, such as double layered metallic nanoslit array have also been investigated [31,32] to further explore the EOT phenomenon. Inside the 3 laboratory, researchers have already introduced metallic nanoslits into the technique of nanolithography in both near field [33] and far field [34].…”