(a) Schematic illustration of Au NPs deposition on the surface of AAO template by a rotating sputtering technique. SEM images of the Au NPs with deposition time t d = 90 s (b), t d = 120 s (c), and t d = 150 s (d). The scale of each image is identical.
High magnification SEM images of the Au NPs with deposition time t d = 90 s (a) and t d = 120 s (b). Hexagonally arrayed Au NPs were obtained at t d = 120 s. The scale of each image is identical.
Optical absorption spectra of the Au NPs with t d = 90, 110, 120, 130, and 150 s. The sample with t d = 120 s has a strong plasmon resonance ranging from 600 nm to 850 nm.
MPL of Au NPs deposited on an AAO template. (a) MPL spectra of the Au NPs with t d = 120 s under different excitation intensities. (b) Excitation power dependence of the MPL intensity with t d = 90, 120, and 150 s. The excitation power dependence of reference sample of rhodamine B is also shown. (c) Deposition time dependence of MPL intensity. The Au NPs with t d = 120 s have the highest ν (=2.85) and strongest MPL.
The field distributions for central cross section of a single Au NP (a) and hexagonally arrayed Au NPs (b) at wavelength of 800 nm. The geometry of the Au NP arrays is the same as that shown in Fig. 2(b). The radius and height of the NP is 18 and 17 nm, respectively. The center distance between two adjacent NPs is 51 nm. The polarization direction and propagation direction of the excited electric field are x axis and z axis, respectively.
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