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(a) SEM of the -cut micro-prism positioned in the vicinity of nanowires. (b) SEM of nanowires is located within from the edge of the sample. (c) Schematics of the two excitation and detection geometries: from the top or via reflection on the prism along the z axis. (d) White light reflection image and nanowire photoluminescence obtained via the prism. Inset shows the nanowire emission with white light off.
Photoluminescence spectroscopy of the quantum dot in NW1 measured by using either excitation and detection from the top of the sample in (a) or via reflection of the prism in (b).
(a) PL spectroscopy of the quantum dot in NW2 that is lying along the z axis, facing the prism. (b) The same quantum dot PL measured via the prism. The spectra are acquired at saturation of the s-shell and are normalized to the maximum intensity of (b). (c) Emission intensity of the s-shell measured from the top as a function of the linear polarization angle. (d) Polarization dependent PL obtained via the prism. Lines in (c) and (d) are a cos2α fit to experimental data (symbols).
Calculated angular radiation pattern for an electric dipole (double arrow) positioned perpendicular (a) or parallel (b) to the interface between vacuum ( ) and ( ). Insets show emission profiles in vacuum. (c) Radiated power for a dipole perpendicular to the interface (solid) compared to vacuum (dashed). Inset shows the power radiated by a parallel dipole at the interface (solid) compared to vacuum (dashed). (d) Light collection enhancement obtained via the prism instead of typical collection from the top for perpendicular (solid-blue) and parallel (dotted-green) aligned dipole. The area between dashed curves represents the expected collection enhancement taking into account both components. The dashed vertical line indicates the NA used in the experiments and the red dot represents the measured collection efficiency enhancement.
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