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The efficiency of collecting photons from optically active defect centres in bulk diamond is greatly reduced by refraction and reflection at the diamond-air interface. We report on the fabrication and measurement of a geometrical solution to the problem; integrated solid immersion lenses (SILs) etched directly into the surface of diamond. An increase of a factor of 10 was observed in the saturated count-rate from a single negatively charged nitrogen-vacancy (NV-) within a 5um diameter SIL compared with NV-s under a planar surface in the same crystal. A factor of 3 reduction in background emission was also observed due to the reduced excitation volume with a SIL present. Such a system is potentially scalable and easily adaptable to other defect centres in bulk diamond.
|Translated title of the contribution||Strongly enhanced photon collection from diamond defect centres under micro-fabricated integrated|
|Pages (from-to)||241901-1 - 241901-3|
|Number of pages||3|
|Journal||Applied Physics Letters|
|Publication status||Published - 1 Jun 2010|