Anisotropic metamaterials for increased coupling to the near-field of small emitters
by Prof. S. Anantha Ramakrishna (Indian Institute of Technology Kanpur)
Thursday, April 11, 2019 from to (Asia/Kolkata)
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.