Dispersion of surface plasmon polaritons on short-pitch metal gratings

Hooper, Ian R.; Sambles, J. R.

doi:10.1103/physrevb.65.165432

Cited by 95 publications

(77 citation statements)

References 14 publications

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“…Figure 3 Clearly, the two reflection minima are adjacent harmonics of the fundamental cavity mode resonance that exists in the grooves of the structure when the wires are optically thick and the grooves are narrow. Furthermore, examining the dependence of this family of modes on the grating height, and examining their dispersion diagrams as the height is varied, shows that they evolve from normal surface plasmon modes and, subsequently, they behave in exactly the same way as the cavity modes discussed in a similar investigation into surface relief gratings with a Gaussian cross-section [6].…”

Section: Resultsmentioning

confidence: 99%

“…However, it has been shown that surface plasmons may be excited in the zero-order region of the spectrum, as they evolve to form cavity modes in the grooves of the structure [4][5][6]. Further work has also examined the nature of these cavity modes on gratings whose ridges are sufficiently narrow that the surface plasmon modes on each vertical surface may also interact through the metal ridges, as well as across the grooves [7,8].…”

Section: Introductionmentioning

confidence: 99%

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Surface plasmon polaritons on deep, narrow-ridged rectangular gratings

et al. 2009

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The dispersion diagrams of surface plasmon polaritons have been calculated for rectangular gratings, with very narrow wires, of varying depths. For gratings with a moderate height a family of vertical-standing-wave resonances may be excited, which consist of surface plasmons, oscillating on either vertical surface, coupling together through the metal wires. These modes evolve similarly to the manner in which shallow-grating surface-plasmon dispersion curves evolve into cavity modes in the grooves of the structure. However, on further increase in grating height these vertical standing waves evolve into a second resonant feature, which is independent of yet further increases in height. This new mode is shown to be equivalent to the resonances found on infinite multilayer metal/dielectric structures illuminated at normal incidence.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Surface plasmon polaritons on deep, narrow-ridged rectangular gratings

et al. 2009

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“…5,6 Through modeling it has also been shown that it is possible to excite these flat-banded SPP's on zero-order gratings where SPP excitation would not be possible on lower aspect ratio structures. [7][8][9] However, the resonant absorption bands are found to be very broad and shallow. These flatbanded SPP modes have antisymmetric charge distributions on either side of the grating grooves, the fields of which then couple together to produce a highly localized self-coupled SPP.…”

Section: Introductionmentioning

confidence: 98%

Surface plasmon polaritons on narrow-ridged short-pitch metal gratings

Hooper

Sambles

2002

Phys. Rev. B

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The reflectivity of short pitch metal gratings consisting of a series of narrow Gaussian ridges in the classical mount has been modeled as a function of frequency and in-plane wave vector ͑the plane of incidence containing the grating vector͒ for various ridge heights. Surface plasmon polaritons ͑SPP's͒ are found to be excited even in the zero-order region of the spectrum. These may result in strong absorption of radiation polarized with its electric field in the plane of incidence ͑transverse magnetic͒. For zero in-plane wave vector the SPP modes consist of a symmetric charge distribution on either side of the grating ridges, a family of these modes existing with different numbers of field maxima per grating period. Because of the charge symmetry these modes may only be coupled to at angles away from normal incidence where strong resonant absorption may then occur. The dispersion of these SPP modes as a function of the in-plane wave vector is found to be complex arising from the formation of very large band gaps due to the harmonic content of the grating profile, the creation of a pseudo high-energy mode, and through strong interactions between different SPP bands.

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“…The splitting is highly dependent on the grating geometry, more specifically on the fillfactor FF and triangle height H. The effects of the two geometrical parameters can be traced by examining the Fourier expansion of the grating profile [24]. It can be shown that at FF=1…”

Section: A Using Spp Modesmentioning

confidence: 99%

Angle insensitive enhancement of organic solar cells using metallic gratings

Abass

Shen

Bienstman

et al. 2011

Journal of Applied Physics

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We explore the optical enhancement of organic photovoltaic cells by incorporating a metallic grating as the back contact. We numerically demonstrate a strongly enhanced light absorption exploiting a complex interplay between multiple electromagnetic wave phenomena, among which Surface Plasmon Polariton (SPP) resonances, waveguide mode resonances, Fabry-Perot modes and scattering. We focus on a triangular grating structure and describe the particular opportunities to obtain a good angular performance. In addition we introduce a novel multiperiodic geometry that incorporates multiple types of SPP resonances. Our triangular structure shows an increased absorption of 15.6% with the AM1.5G spectrum in the 300-800nm wavelength range. For the multiperiodic grating case a significant further increase to 20.7% is shown. * Electronic address: aimi.abass@elis.ugent.be 1

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Dispersion of surface plasmon polaritons on short-pitch metal gratings

Cited by 95 publications

References 14 publications

Surface plasmon polaritons on deep, narrow-ridged rectangular gratings

Surface plasmon polaritons on deep, narrow-ridged rectangular gratings

Surface plasmon polaritons on narrow-ridged short-pitch metal gratings

Angle insensitive enhancement of organic solar cells using metallic gratings

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