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Many experiments in the field of optical levitation with nanoparticles todayare limited by the available technologies for particle loading. Here weintroduce a new particle loading method that solves the main challenges, namelydeterministic positioning of the particles and clean delivery at ultra-highvacuum levels as required for quantum experiments. We demonstrate the efficientloading, positioning, and repositioning of nanoparticles in the range of$100-755\,\mathrm{nm}$ diameter into different lattice sites of a standing waveoptical trap, as well as direct loading of nanoparticles at an unprecedentedpressure below $10^{-9}\,\mathrm{mbar}$. Our method relies on the transport ofnanoparticles within a hollow-core photonic crystal fiber using an opticalconveyor belt, which can be precisely positioned with respect to the targettrap. Our work opens the path for increasing nanoparticle numbers in the studyof multiparticle dynamics and high turn-around times for exploiting the quantumregime of levitated solids in ultra-high vacuum.

Hollow-core fiber loading of nanoparticles into ultra-high vacuum