title: Composite optical microcavity of diamond nanopillar and silica microsphere.
abstract: A composite optical microcavity, in which nitrogen vacancy (NV) centers in a diamond nanopillar are coupled to whispering gallery modes in a silica microsphere, is demonstrated. Nanopillars with a diameter as small as 200 nm are fabricated from a bulk diamond crystal by reactive ion etching and are positioned with nanometer precision near the equator of a silica microsphere. The composite nanopillar-microsphere system overcomes the poor controllability of a nanocrystal-based microcavity system and takes full advantage of the exceptional spin properties of NV centers and the ultrahigh quality factor of silica microspheres.
authors.affiliation: Department of Physics and Oregon Center for Optics, University of Oregon, Eugene, Oregon 97403, USA.
authors.forename: Mats
authors.initials: M
authors.lastname: Larsson
authors.forename: Khodadad Nima
authors.initials: KN
authors.lastname: Dinyari
authors.forename: Hailin
authors.initials: H
authors.lastname: Wang