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Latin America Optics and Photonics Conference

Driving Waveform Dependency of Energy Dissipation of Trapped Particles

Martin Kernbach, Oskar Sund, Andreas Wolfgang Schell

Published Jan 1, 2022• 0 citations
Publisher

Abstract

Here, we present a numerical simulation of the trapping of particles in a Paul trap to analyse the impact of exotic driving waveforms to disclose the trapping dynamic and maximize the energy dissipation for applied additional cooling techniques.
DOI
10.1364/laop.2022.m2d.6

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Cooling of ions or other charged particles in electromagnetic traps is an essential tool to achieve control over their degrees of freedom on the quantum level. For many objects, there is no viable route for direct cooling, such as an accessible laser cooling transition. In such a case, the sympathetic cooling can be used, where a particle with such a direct route is used to cool down the other particle via Coulomb interaction. On the downside, this cooling process often is inefficient. Here, we numerically evaluate the sympathetic cooling performance in a quadrupole ion trap for different driving waveforms. We find that using different driving waveforms and optimized trap parameters the sympathetic cooling performance can be enhanced. These results will open up the way to achieve larger sympathetic cooling rates from which many techniques, such as aluminum ion clocks, might profit.
In this M.Phil thesis, a hybrid trap for optomechanical studies of mesoscopic particle is investigated. It uses a Planar Paul Trap (PPT) for electrical confinement and a parabolic mirror for optical confinement. The PPT is compatible with the printed circuit board (PCB) technology making it easier to integrate with the mirror trap. This compatibility also simplifies particle loading, enhances ground state cooling and improves optical interrogation within the trap. It can create various potential landscapes of a quartic potential, including double well or inverted harmonic, and is a potential tool for investigating macroscopic quantum superposition states. This planar geometry of the Paul trap allows large optical access required for optical confinement and detection of the particle. The parabolic mirror provides the benefits of virtually no chromatic aberration, high numerical aperture and functioning as an additional RF electrode of the hybrid trap. The work includes simulations and experiments to characterize the hybrid trap by analyzing the effective trapping potential. From the numerical simulations, the ratio of axial to radial secular frequencies of the trapped particle under the RF drive is = 0.98, implying the chosen parameters of the PPT + mirror RF trap has approximately the same stiffness and hence confinement in the axial and radial directions. It is also observed that the dynamics of a single particle under the RF drive is not affected by damping and random forces in a high vacuum (∼ 10-6 mbar).