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(a) Array of Ag nanoparticles with diameter and pitch on Si-QD-doped quartz. (b) SEM images of a series of Ag nanoparticle arrays with and . (c) PL intensity map over a representative Ag array (, , and ) in steps, integrated from to .
Optical characterization of a representative sample (, , and ). (a) Normalized transmission through the Ag nanoparticle array. (b) PL intensity from Si QDs in the absence (bottom curve) and presence (top curve) of Ag islands. (c) PL intensity enhancement [ratio of curves in (b)].
PL intensity enhancement (solid lines) and normalized transmission spectra (dashed lines) for samples with and ; increases from the top to bottom panels, with , 185, 190, 230, 260, and , respectively.
(a) Correspondence between the wavelength of minimum transmission and the wavelength of maximum PL enhancement for 187 different samples. (b) Comparison between the maximum magnitude of PL enhancement and the wavelength at which this maximum is reached for 201 different samples.
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