Colloidal Quantum Dots in High-Q Pillar Microcavities

In summary, we have fabricated high-Q micropillar cavities with circular and elliptical cross section containing CdSe/ZnS quantum dots or rods in the spacer layer. We find a systematically higher Q-factor along the short axis of the elliptical pillar compared to circular ones. The spectral position of the cavity resonances have been calculated by modeling the pillar cavity as a waveguide with an effective refractive index.