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Optimization of finite diffraction gratings for the excitation of surface plasmons
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10.1063/1.2401025
/content/aip/journal/jap/100/12/10.1063/1.2401025
http://aip.metastore.ingenta.com/content/aip/journal/jap/100/12/10.1063/1.2401025
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) Dispersion curve of the SPP mode propagating at a free metal-air interface. The diagonal solid lines correspond to the light lines . (b) Dispersion curve of the SPP mode at a periodically modulated interface with period . The modes are characterized by their frequency and their longitudinal wave vector inside the first Brillouin zone.

Image of FIG. 2.
FIG. 2.

(a) Geometrical parameters of a grating of gold grooves engraved in a semi-infinite gold space. The height of the modulated part is , the width of the grooves is , and the period is . (b) For a grating of protrusions, represents the width of the metallic part.

Image of FIG. 3.
FIG. 3.

Specular reflection coefficient of a plane wave incident on a grating engraved inside a semi-infinite gold space (low values in black). The periodicity is and the width is in the three cases. The depth of the grooves is: (a) , (b) , and (c) .

Image of FIG. 4.
FIG. 4.

Specular reflection coefficient of a plane wave incident on a groove grating engraved inside a semi-infinite gold space [high values (maximum of 1.0) in white, low values (minimum of 0.0) in black], with respect to the period and the width of the groove.

Image of FIG. 5.
FIG. 5.

Electric field intensity in (, ), normalized to the intensity of the incident field, as a function of the periodicity and the width of the defect , for different heights of the modulated part: (a) , (b) , and (c) .

Image of FIG. 6.
FIG. 6.

(a) SPP intensity in for optimal period and width parameters, as a function of the height . (b) Duty cycle for optimal coupling parameters as a function of . Both curves correspond to a groove grating.

Image of FIG. 7.
FIG. 7.

SPP intensity in normalized to the intensity of the incident field, as a function of the period and the width of the defect. Two different grating heights are considered: [(a) and (b)] and [(c) and (d)] . Two types of gratings are investigated: [(a) and (c)] groove grating and [(b) and (d)] protrusion grating. For comparison purpose, data for the groove grating are shown as a function of [(a) and (c)].

Image of FIG. 8.
FIG. 8.

SPP normalized intensity in for a grating on a thick gold layer in air. [(a)–(c)] protrusion grating and [(d)–(f)] groove grating. Three different grating amplitudes are investigated: [(a) and (b)] , [(b) and (e)] , [(c) and (f)] .

Image of FIG. 9.
FIG. 9.

(a) SPP intensity in for optimal grating period and width, as a function of the height . (b) Duty cycle for best coupling parameters ( and ) as a function of . Both curves correspond to a groove grating on a gold slab.

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/content/aip/journal/jap/100/12/10.1063/1.2401025
2006-12-18
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Optimization of finite diffraction gratings for the excitation of surface plasmons
http://aip.metastore.ingenta.com/content/aip/journal/jap/100/12/10.1063/1.2401025
10.1063/1.2401025
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