Practical transformation media for mode-matched interaction of light with single quantum emitters

The efficient interaction of light with single quantum emitters depends critically on the modal overlap between the incident and scattered photons. This usually calls for high-numerical-aperture optics in order to match the dipole radiation pattern of the emitter in free space. Such a requirement can be alleviated if the emitter is embedded in a medium that shapes its radiation into a collimated output beam. We here present simple-to-realize, all-dielectric and isotropic transformation media that perform such a mode conversion.