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Plasmonic trapping with realistic dipole nanoantennas: Analysis of the detection limit
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10.1063/1.3650267
/content/aip/journal/apl/99/15/10.1063/1.3650267
http://aip.metastore.ingenta.com/content/aip/journal/apl/99/15/10.1063/1.3650267
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online) (a) 3D rendering of a realistic dipole antenna with gold NPs placed in different locations. (b) Scattering cross-section for the antenna in (a) with a 15 nm NP located (A) in the center of the gap, (B) at one end, (C) on one side, (D) laterally in the gap. An antenna without NP exhibits the same scattering cross section as that corresponding to (D). The coupling causes a red-shift of the LSPR which strongly depends on the position of the NP. (c) Peak wavelength shift and field intensity as a function of the position along the x axis (y = 0) caused by a 15 nm gold NP for the antenna in (a) and for an ideal dipole antenna (shift scaled by a factor of 1/3). The shift is linear with the near-field intensity felt by the NP.

Image of FIG. 2.
FIG. 2.

(Color online) Shift of the LSPR as a function of the NP volume and material for (a) 25 nm gap and NPs in the center, position A in Fig. 1(a); (b) 15 nm gap and NPs in the center (position A); and (c) 25 nm gap and NPs at one extremity (position B). The highest sensitivity is obtained for the case (b), where the field intensity is greatest.

Image of FIG. 3.
FIG. 3.

(Color online) Shift of the LSPR as a function of the gap width for different gold NPs placed in the center, position A in Fig. 1(a). The sensitivity increases with decreasing gap size.

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/content/aip/journal/apl/99/15/10.1063/1.3650267
2011-10-11
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Plasmonic trapping with realistic dipole nanoantennas: Analysis of the detection limit
http://aip.metastore.ingenta.com/content/aip/journal/apl/99/15/10.1063/1.3650267
10.1063/1.3650267
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