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Q: Fachverband Quantenoptik und Photonik

Q 21: Poster I

Q 21.60: Poster

Dienstag, 9. März 2010, 16:00–19:00, Lichthof

Studies on the gap of a solid immersion lens-diamond interface using raytracing — •Stefan Bischof — 3. Physikalisches Institut, Universität Stuttgart

An NV center is a vacancy in diamond with a neighboring nitrogen atom. Its flourescence gives allows to determine its quantum state. At low temperatures this read out process could be used for quantum computation. Its application as a photon source for quantum computation. An increase of collection of photons allows the realisation of single shot read out.

The loss of photons on a diamond-air interface can be reduced by using a half-ball shaped solid immersion lens (SIL). Light irradiated from the center of a ball suffers no internal reflexion on the ball surface. A raytracing simulation shows interesting properties of a SIL. The projection of the light beams on the object plane shows a gaussian profile.

The parameter x₀ for the misalignment from the optical axis broke the symmetry of the problem. Varying the parameters shows: the center of the gaussian profile still remains in the optical axis. Taking multi-beam-interference into account the gaussian profile is modulated depending on the gap height. The control of this modulation allows to have even higher count rates than without a gap.