@article {3907, title = {PT-like phase transition and limit cycle oscillations in non-reciprocally coupled optomechanical oscillators levitated in vacuum}, journal = {Nat. Phys.}, year = {2024}, note = {

Publisher: Nature Publishing Group

}, pages = {1{\textendash}7}, abstract = {

Nanoparticles levitated in an optical trap provide a versatile platform to study mechanical oscillators in a controlled environment with tuneable parameters. Recently, it has become possible to couple two of these optomechanical oscillators. Here we demonstrate the collective non-Hermitian dynamics of such a pair of non-conservatively coupled oscillators. We take advantage of the tunability of the optical interactions between the particles in our system and set the optical interaction between the particles to be purely non-reciprocal. By continuously varying the relative power of the trapping beams, we take the system through a transition similar to a parity{\textendash}time phase transition. A Hopf bifurcation at a critical point results in the formation of collective limit cycle oscillations, resembling those observed in phonon lasers. These coupled levitated oscillators provide a platform for exceptional point optomechanical sensing and can be extended to multi-particle systems, paving the way for the development of topological optomechanical media.

}, issn = {1745-2481}, doi = {10.1038/s41567-024-02590-1}, url = {https://www.nature.com/articles/s41567-024-02590-1} } @article {3754, title = {Synchronization of spin-driven limit cycle oscillators optically levitated in vacuum}, journal = {Nature Communications}, volume = {14}, year = {2023}, pages = {5441}, doi = {10.1038/s41467-023-41129-5}, url = {https://doi.org/10.1038/s41467-023-41129-5} } @article {3606, title = {All-optical sub-Kelvin sympathetic cooling of a levitated microsphere in vacuum}, journal = {Optica}, volume = {9}, year = {2022}, month = {Sep}, pages = {1000{\textendash}1002}, abstract = {

We demonstrate all-optical sympathetic cooling of a laser-trapped microsphere to sub-Kelvin temperatures, mediated by optical binding to a feedback-cooled adjacent particle. Our study opens prospects for multi-particle quantum entanglement and sensing in levitated optomechanics.

}, doi = {10.1364/OPTICA.466337}, url = {https://opg.optica.org/optica/abstract.cfm?URI=optica-9-9-1000} } @article {3478, title = {Stochastic Hopf bifurcations in vacuum optical tweezers}, journal = {Phys. Rev. A}, volume = {104}, year = {2021}, month = {OCT 15}, pages = {043518}, issn = {2469-9926}, doi = {10.1103/PhysRevA.104.043518} } @article {3368, title = {Entropy Production in an Elementary, Light Driven Micro-Machine}, journal = {Frontiers in Physics}, volume = {8}, year = {2020}, pages = {538}, abstract = {

We consider the basic, thermodynamic properties of an elementary micro-machine operating at colloidal length scales. In particular, we track and analyze the driven stochastic motion of a carefully designed micro-propeller rotating unevenly in an optical tweezers, in water. In this intermediate regime, the second law of macroscopic thermodynamics is satisfied only as an ensemble average, and individual trajectories can be temporarily associated with decreases in entropy. We show that our light driven micro-propeller satisfies an appropriate fluctuation theorem that constrains the probability with which these apparent violations of the second law occur. Implications for the development of more complex micro-machines are discussed.

}, issn = {2296-424X}, doi = {10.3389/fphy.2020.593122}, url = {https://www.frontiersin.org/article/10.3389/fphy.2020.593122} } @article {DonatoNL19, title = {Optical Trapping, Optical Binding, and Rotational Dynamics of Silicon Nanowires in Counter-Propagating Beams}, journal = {Nano Lett.}, volume = {19}, year = {2019}, pages = {342-352}, doi = {10.1021/acs.nanolett.8b03978} } @article {SvakNC18, title = {Transverse spin forces and non-equilibrium particle dynamics in a circularly polarized vacuum optical trap}, journal = {Nature Commun.}, volume = {9}, year = {2018}, pages = {5453}, doi = {10.1038/s41467-018-07866-8} } @article { SimpsonNL17, title = {Optical Binding of Nanowires}, journal = {Nano Lett.}, volume = {17}, number = {6}, year = {2017}, pages = {3485-3492}, doi = {10.1021/acs.nanolett.7b00494} } @article { BrzobohatyOE16, title = {Chiral particles in the dual-beam optical trap}, journal = {Opt. Express}, volume = {24}, year = {2016}, pages = {26382-26391}, doi = {10.1364/OE.24.026382} } @article { AntognozziNPhys16, title = {Direct measurements of the extraordinary optical momentum and transverse spin-dependent force using a nano-cantilever}, journal = {Nat. Phys.}, volume = {12}, year = {2016}, pages = {731-735}, doi = {10.1038/nphys3732} } @article { IrreraNL16, title = {Photonic Torque Microscopy of the Nonconservative Force Field for Optically Trapped Silicon Nanowires}, journal = {Nano Lett.}, volume = {16}, year = {2016}, pages = {4181-4188}, doi = {10.1021/acs.nanolett.6b01059} } @article { BzdekCS16, title = {Precise, contactless measurement of the surface tension of picolitre aerosol droplets}, journal = {Chem. Sci.}, volume = {7}, year = {2016}, pages = {274-285}, doi = {10.1039/C5SC03184B} } @article { SimpsonPRA16, title = {Synchronization of colloidal rotors through angular optical binding}, journal = {Phys. Rev. A}, volume = {93}, year = {2016}, pages = {023842}, doi = {10.1103/PhysRevA.93.023842} } @article { BrzobohatyOE15b, title = {Complex rotational dynamics of multiple spheroidal particles in a circularly polarized, dual beam trap}, journal = {Opt. Express}, volume = {23}, year = {2015}, pages = {7273-7287}, doi = {10.1364/OE.23.007273} } @article { BoxPRE15, title = {Transitional behavior in hydrodynamically coupled oscillators}, journal = {Phys. Rev. E}, volume = {91}, year = {2015}, pages = {022916}, doi = {10.1103/PhysRevE.91.022916} }