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Near-field optical response of periodically arrayed plasmonic nanogap antennas
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10.1063/1.4813129
/content/aip/journal/jap/114/2/10.1063/1.4813129
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/2/10.1063/1.4813129
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) Schematic diagram of a 2D periodic array of nanoantennas. (b) Schematic cross-sectional view, showing how incident light is coupled to a standing wave in the array structure under resonant conditions.

Image of FIG. 2.
FIG. 2.

Geometry of the system used in our calculations. Gold nanoblock dimers are attached to a glass surface in an air atmosphere.

Image of FIG. 3.
FIG. 3.

(a) xy plot of the normalized electric field intensity on a plane cutting through the middle of the nanoblock thickness. (b) Expanded view of (a) around the gap region. The color plots use a logarithmic scale.

Image of FIG. 4.
FIG. 4.

Normalized near-field intensity spectra for a series of array periods. (a) Spectra with a coarse period interval of 100 nm. The strongest peak is found at a period of 500 nm. (b) Spectra with a fine period interval of 10 nm.

Image of FIG. 5.
FIG. 5.

Linear plots of the Ex field in the yz plane for incident light of wavelength (a) 795 nm (on-resonance) and (b) 990 nm (off-resonance). Intensities outside the range of the color scale (|Ex| > 2) are shown in white.

Image of FIG. 6.
FIG. 6.

Influence of dimer orientation and gap size on near-field spectra. (a) Near-field spectra and (b) wavelength and intensity of spectral peak for different dimer orientations. (c) Near-field spectra and (d) wavelength and intensity of spectral peak for different gap sizes. The array period was fixed at 520 nm.

Image of FIG. 7.
FIG. 7.

Normalized near-field intensity spectra for an isolated single-nanogap antenna (bottom panel), finite 3 × 3 (second bottom), and 5 × 5 (second top) arrays and an infinite array structure [top panel, same as in Fig. 4(b) ] for a period of 520 nm.

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/content/aip/journal/jap/114/2/10.1063/1.4813129
2013-07-12
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Near-field optical response of periodically arrayed plasmonic nanogap antennas
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/2/10.1063/1.4813129
10.1063/1.4813129
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