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(Color online) (a) Transmission electron microscopy image of an end-to-end coupled Ag NW pair with the inset showing the thickness of individual NW to be 112 nm; optical microscopy image of a longer end-to-end coupled Ag NW in (b) bright-field and (c) dark field illumination.
(Color online) Optical image of focused laser beam of 633 nm wavelength illuminating one end of Ag NW pair in the (a) presence and (b) absence of bright-field illumination. The lengths of the two wires were 6.6 μm and 5.6 μm. The arrow in (b) represents polarization of incident light; (c) and (d) are identical to (a) and (b) for a different nanowire pair of length 8.8 μm and 7.6 μm; and (e) 3 D projection of optical image in (d) indicating the input light and emitted light at the junction and distal end of Ag NW pair.
(Color online) (a) Surface enhanced Raman spectra of r6G molecule adsorbed to Ag NW pair with the dotted box indicating the 1361 cm−1 band used for Raman imaging; (b) Optical image and the corresponding (c) Far-field Raman image of Ag NW pair; and The arrow in (c) represents the polarization of 632.81 nm Raman excitation.
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