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Simulation of a plasmonic tip-terminated scanning nanowire waveguide for molecular imaging
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10.1063/1.3013816
/content/aip/journal/apl/93/19/10.1063/1.3013816
http://aip.metastore.ingenta.com/content/aip/journal/apl/93/19/10.1063/1.3013816
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic of the gold NP-terminated ZnO NW waveguide that is scanned on a cell membrane conjugated with gold NP SERS or FL probes.

Image of FIG. 2.
FIG. 2.

(a) Calculated electric field distribution on the NW central cross section plane when the gold NP tip of the ZnO NW is scanned at a distance of 8 nm above a gold substrate that is tilted from the horizontal by an angle . The dashed lines are added to outline the 202 nm thick cantilever layer, 100 nm thick silver film, 100 nm diameter ZnO NW and gold NP tip, and the gold substrate surface. Image size: . (b) field profile along a horizontal line passing the center of the bright spot shown in the inset. Inset: field distribution on a plane 2 nm above the tilted gold substrate surface for the simulation result in (a). Image size: . (c) The maximum field at the tip-sample gap as a function of . Symbols are the simulation results. The line is a least square fit of the symbols.

Image of FIG. 3.
FIG. 3.

(a) FDTD simulation results of field distribution on the NW central cross-section plane when the NW is scanned on a 20 nm gold NP on a glass slide, which is tilted from the horizontal by . The horizontal distance between the tip center and the center of the 20 nm Au NP is . The dashed lines are added to outline the cantilever layer, Ag film, ZnO NW and Au NP tip, the 20 nm diameter Au NP, and the surface of the glass slide. Image size: . (b) Maximum electric field at the tip-NP gap as a function of . Negative (or positive) corresponds to the case when the 20 nm NP is at the left (or right) side of the tip in (a). Symbols are the simulation results. The line is a least square fit of the symbols.

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/content/aip/journal/apl/93/19/10.1063/1.3013816
2008-11-10
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Simulation of a plasmonic tip-terminated scanning nanowire waveguide for molecular imaging
http://aip.metastore.ingenta.com/content/aip/journal/apl/93/19/10.1063/1.3013816
10.1063/1.3013816
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