Interference-Based 3D Optical Cold Damping of a Levitated Nanoparticle

TL;DR

This paper demonstrates a novel interference-based optical feedback cooling method for levitated nanoparticles, achieving three-dimensional cooling without additional beam paths, advancing precision sensing and quantum control in levitated optomechanics.

Contribution

The authors introduce an interference-enhanced optical force technique for 3D feedback cooling of levitated nanoparticles within a single beam path, simplifying the setup and broadening applicability.

Findings

Achieved cooling of a 142-nm silica nanoparticle to millikelvin temperatures in three dimensions.

Demonstrated control of cooling dynamics via feedback gain and pressure adjustments.

Validated the cold-damping model describing the cooling process.

Abstract

Achieving efficient three-dimensional feedback cooling of levitated nanoparticles is a key requirement for precision sensing and quantum control in levitated optomechanics. Here we demonstrate three-dimensional optical feedback cooling of a levitated nanoparticle using an interference-enhanced optical force generated within a single beam path. In this scheme, a weak auxiliary field co-propagates with the trapping tweezer and interferes with it to produce a tunable optical force that enables cold damping along all three center-of-mass motional axes without additional beam paths or trap reconfiguration. Using this approach, we cool a 142-nm-diameter silica nanoparticle in high vacuum to effective temperatures of 625.8, 711.6, and 19.9 mK along the $x$, $y$, and $z$ directions, respectively, at a pressure of $8.5\times10^{-6}$ mbar. The cooling dynamics and their dependence on feedback gain and pressure are well described by a cold-damping model. Because the feedback force is generated optically, the scheme does not rely on electrical actuation and is directly compatible with neutral particles. These results establish interference-based optical forces as a simple and broadly applicable mechanism for three-dimensional feedback control in levitated optomechanics, with a clear pathway toward the quantum regime under improved vacuum and detection conditions.