Anisotropic metamaterials for increased coupling to the near-field of small emitters

Metamaterials can possess extremely large anisotropy resulting in hyperbolic dispersion of light (the equi-frequency surfaces become   hyperboloids).  This provides for good coupling to the modes with   large transverse momentum in the near-field of small sized emitters including quantum emitters.   This can be utilized to highly improve the outcoupling of light from these emitters. In this talk, I will  present  our work on two such systems: one, a nanostructured metamaterial  fiber with hyperbolic dispersion and enhanced coupling to sources, and two,  emission of NV centers in nanodiamonds placed in nano-columnar thin films  of silver. The large  improvement in outcoupling by several orders of magnitude makes these hyperbolic media of enormous potential for various applications.