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(Color online) (a) Fabrication of encapsulated CdSe quantum dot (QD) in Au thin film. (b) Imaging sample configuration.
(Color online) (a) Fluorescence image of the quantum dots covered with Au films in various thicknesses. The top left two pictures are illustration and bright field image showing that half of the field shown is covered with Au while another half is not. (b) Fluorescence emission spectra of single QD covered with various thicknesses of Au in comparison with bare single QD from the samples shown in (a).
(Color online) (a) Fluorescence emission spectra of single QD covered with various thicknesses of Au after smoothing and the normalization with respect to that of the bare single QD. (b) Averaged fluorescence intensity of 30 quantum dots from the samples shown in Fig. 2(a).
(Color online) (a) Simulated electric field in the nanopocket encapsulated single QD. The localized electric field is enhanced for more than ten times at the Au sharp edge in contact with the QD. (b) The dispersion relation of the SPP modes taking place at the three-layer (air-Au-glass) structure with varying Au film thickness. (c) The corresponding amplitude attenuation of the SPP at the QD fluorescence wavelength as a function of the Au film thickness.
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