Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Microscopic diamond Solid-Immersion-Lenses fabricated around single
  defect ceneters by focussed ion beam milling   Recent efforts to define microscopic solid-immersion-lenses (SIL) by focused
ion beam milling into diamond substrates that are registered to a preselected
single photon emitter are summarized. We show how we determine the position of
a single emitter with at least 100 nm lateral and 500 nm axial accuracy, and
how the milling procedure is optimized. The characteristics of a single
emitter, a Nitrogen Vacancy (NV) center in diamond, are measured before and
after producing the SIL and compared with each other. A count rate of 1.0
million counts per second is achieved with a $[111]$ oriented NV center.

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The categories of this paper are: nlin
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The categories of this paper are: alg-geom
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The categories of this paper are: cmp-lg
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The categories of this paper are: funct-an
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The categories of this paper are: hep-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: stat
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The categories of this paper are: astro-ph
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The categories of this paper are: math-ph
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The categories of this paper are: q-fin
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The categories of this paper are: cs
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The categories of this paper are: plasm-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: chem-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: solv-int