Characterization of the surface plasmon polariton band gap in an Ag/SiO_2/Ag T-shaped periodical structure

Abstract

In this study, the localized surface plasmon polariton (LSPP) band gap of an Ag/SiO(2)/Ag asymmetric T-shaped periodical structure is demonstrated and characterized. The Ag/SiO(2)/Ag asymmetric T-shaped periodical structure was designed and fabricated to exhibit the LSPP modes in an infrared wavelength regime, and its band gap can be manipulated through the structural geometry. The LSPP band gap was observed experimentally with the absorbance spectra and its angle dependence characterized with different incident angles. Such a T-shaped structure with a LSPP band gap can be widely exploited in various applications, such as emitters and sensors.

Band diagrams and field distribution of squarely-modulated slab metallic gratings

“…7(a), was reported in Ref. [10][11][12]. The field distribution induced by a complex cap structure includes numerous local corners for SPP resonance, which results in relatively robust excitation of the SPP modes at all incident angles.…”

“…8 Novel structures, such as sandwiched metaloxide-metal, 9 gap plasmonic devices, and T-shaped metal cap structures have been developed. [10][11][12] Some of these designs are suitable for sensor-based devices, 13,14 while others are better suited to wide angle filters. 15 A variety of structures have been developed to meet a range of application requirements.…”

Interactions between excitation and extraction modes in an organic-based plasmon-emitting diode

“…In the device-2 structure, the SP resonance characteristics of angle shift are opposite those of the device-1 structure. The SPR propagation loss occurs mainly owing to the surface roughness and the electric field characteristic of hetero-junction contact in the dielectric/metal interfaces [26]. Fig.…”

“…500 nm of the pitch size allows for the otherwise absorption SPR mode to be coupled by the SPGCE diffraction condition. The spectral position of this resonance is governed by the pitch size and shape and by the dielectric functions of both the metal and the surrounding media [17,26,27]. Organic layer Alq 3 and periodical structures are used as the medium to demonstrate control over SPPs propagation on the SPGCE structures.…”

Phase matching for surface plasmon enhanced second harmonic generation in a gold grating slab

“…Periodic grooves with a 1.18 µm spacing were etched into the Au film by electron beam lithography and ion beam etching. 17 The etching stopped short of completely removing the Au film to maintain electrical continuity of the grating. The calculation shows that the SHG on a two-dimensional grating slab is strictly p-polarized for ppolarized incidence.…”