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(a) Two different lattice constants along the W1 WG correspond to the DH NC where (b) magnifies the substrate cross section and (c) shows an AFM image of the QDs in nanometer scale.
(Color online) (a) Dispersion relation of the W1 WG modes obtained by 3D FDTD and (b) an example for the experimental PL spectrum of the QDs, with the modes grouped by polarization. In the inset on the right, modes 1 and 2 are expanded. The excitation power density is .
(Color online) Excitation conditions on resonance. The excitation wavelength for both spectra is (compare Fig. 2). In (a) the excitation matches the mode 4 polarization, whereas in (b) it is perpendicular. The insets show IR images. The localized emission from the NC can only be observed if the excitation laser light matches in wavelength and polarization. The excitation power densities are for (a) and for (b).
(Color online) Spectra for (a) resonant and (b) nonresonant excitations are compared. The excitation power densities are for (a) and for (b).
(Color online) Scatter shows the raw data fitted by a Lorentzian function to estimate the experimental NC . FWHM is .
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