Stabilizing nanoparticles in the intensity minimum: feedback levitation on an inverted potential

• URL: http://arxiv.org/abs/2410.17253v2
• Date: Tue, 12 Nov 2024 10:55:48 GMT
• Title: Stabilizing nanoparticles in the intensity minimum: feedback levitation on an inverted potential
• Authors: Salambô Dago, Jakob Rieser, Mario A. Ciampini, Vojtech Mlynář, Andreas Kugi, Markus Aspelmeyer, Andreas Deutshmann-Olek, Nikolai Kiesel,
• Abstract summary: We demonstrate the stable trapping of a levitated nanoparticles on top of an inverted potential using a combination of optical readout and electrostatic control. Our approach may enable new levitation-based sensing schemes with enhanced bandwidth.
• Score: 2.4625958940786234
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We demonstrate the stable trapping of a levitated nanoparticle on top of an inverted potential using a combination of optical readout and electrostatic control. The feedback levitation on an inverted potential (FLIP) method stabilizes the particle at an intensity minimum. By using a Kalman-filter-based linear-quadratic-Gaussian (LQG) control method, we confine a particle to within $\sigma_x = (9.0 \pm 0.5) nm$ of the potential maximum at an effective temperature of $(16 \pm 1) K$ in a room-temperature environment. Despite drifts in the absolute position of the potential maximum, we can keep the nanoparticle at the apex by estimating the drift from the particle dynamics using the Kalman filter. Our approach may enable new levitation-based sensing schemes with enhanced bandwidth. It also paves the way for optical levitation at zero intensity of an optical potential, which alleviates decoherence effects due to material-dependent absorption and is hence relevant for macroscopic quantum experiments.

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