Abstract
This paper develops and presents a three dimensional analysis of recent experimental demonstrations of cavity-cooling of levitated nanoparticles. The authors show that the one dimensional analysis is insufficient and reveal strong hybridization between motions along different spatial axes, as well as sympathetic cooling.
Highlights
The coupling of mechanical motion to the optical mode of a cavity permits strong cooling, and ultrasensitive displacement detection, and has led to advances ranging from quantum ground-state cooling of mechanical oscillators [1,2] to detection of gravitational waves by LIGO [3]
We have shown that 3D optomechanical displacement sensing can be far from a trivial sum of PSDs associated to the x, y, and zdegrees of freedom
coherent scattering (CS) systems have provided the breakthrough that enabled ground-state cooling in levitated nanoparticles: for reliable thermometry one should either avoid or suppress hybridization regimes or do a full 3D analysis
Summary
The coupling of mechanical motion to the optical mode of a cavity permits strong cooling, and ultrasensitive displacement detection, and has led to advances ranging from quantum ground-state cooling of mechanical oscillators [1,2] to detection of gravitational waves by LIGO [3]. In order to overcome this roadblock, hybrid setups combining, for instance, a tweezer and cavity traps [6,13], or a hybrid electro-optical trap [14,15], or a tweezer and near field of a photonic crystal [16], allowed some progress toward the ultimate goal of quantum ground-state cooling This year, an important breakthrough was the realization that the tweezer trapping light coherently scattered (CS) into an undriven cavity offers major advantages [17,18,19,20,21]: the resulting optomechanical couplings along every axis can be.
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