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(a) Cross section scheme of the molecular beam epitaxy grown heterostructure. Self-assembled CdSe quantum dots were sandwiched between thick ZnSe and thick ZnMgSSe, on either side. The sample was grown on GaAs (001) substrate. (b) Side view electron microscope image of a microdisk with a diameter of at the bottom.
(a) Sketch of the experimental setup: The etched microdisks were glued on a glass plate and the GaAs substrate was removed totally. The photoluminescence was detected in the direction perpendicular to the exciting laser beam for different angles of rotation . (b) Micro-PL spectra for three different . Whispering gallery modes dominate the spectrum for small values, indicating that the modes emit most efficiently in a direction parallel to the disk surface.
Microphotoluminescence spectra for different linear polarizations: TE polarized and TM polarized. The energy positions of narrow and broad modes are indicated by the solid and dotted vertical lines, respectively, each separated by .
Microphotoluminescence spectra of microdisks with different diameters. The mode spacing between consecutive modes (indicated by an arrow) increases with decreasing disk size. Inset: vs disk diameter (circles). The solid line was fitted using Eq. (1) .
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