Subkelvin parametric feedback cooling of a laser-trapped nanoparticle.

@article{Gieseler2012SubkelvinPF,
  title={Subkelvin parametric feedback cooling of a laser-trapped nanoparticle.},
  author={Jan Gieseler and Bradley M. Deutsch and Romain Quidant and Luk{\'a}s Novotn{\'y}},
  journal={Physical review letters},
  year={2012},
  volume={109 10},
  pages={
          103603
        }
}
We optically trap a single nanoparticle in high vacuum and cool its three spatial degrees of freedom by means of active parametric feedback. Using a single laser beam for both trapping and cooling we demonstrate a temperature compression ratio of four orders of magnitude. The absence of a clamping mechanism provides robust decoupling from the heat bath and eliminates the requirement of cryogenic precooling. The small size and mass of the nanoparticle yield high resonance frequencies and high… 
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