01770nas a2200217   4500008004100000022001400041245013300055210006900188300001000257520107000267653000701337653000701344100002101351700002401372700001601396700001901412700002501431700002001456700002101476856005501497       2024                        eng d  a1745-248100aPT-like phase transition and limit cycle oscillations in non-reciprocally coupled optomechanical oscillators levitated in vacuum0 aPTlike phase transition and limit cycle oscillations in nonrecip  a1–73 a<p>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–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.</p>10aLF10aMF1 aLiška, Vojtěch1 aZemánková, Tereza1 aJákl, Petr1 aŠiler, Martin1 aSimpson, Stephen, H.1 aZemánek, Pavel1 aBrzobohatý, Oto  uhttps://www.nature.com/articles/s41567-024-02590-100619nas a2200205   4500008004100000245008900041210006900130300000900199490000700208653000700215653000700222100002100229700002000250700001600270700001600286700001900302700002000321700002500341856004700366       2023                        eng d00aSynchronization of spin-driven limit cycle oscillators optically levitated in vacuum0 aSynchronization of spindriven limit cycle oscillators optically   a54410 v1410aLF10aMF1 aBrzobohatý, Oto1 aDuchaň, Martin1 aJákl, Petr1 aJežek, Jan1 aŠiler, Martin1 aZemánek, Pavel1 aSimpson, Stephen, H.  uhttps://doi.org/10.1038/s41467-023-41129-500919nas a2200217   4500008004100000245008400041210006900125260000800194300001600202490000600218520029100224653000700515653000700522100001400529700001800543700001900561700002000580700001700600700001700617856006700634       2022                        eng d00aAll-optical sub-Kelvin sympathetic cooling of a levitated microsphere in vacuum0 aAlloptical subKelvin sympathetic cooling of a levitated microsph  cSep  a1000–10020 v93 a<p>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.</p>10aLF10aMF1 aArita, Y.1 aBruce, G., D.1 aWright, E., M.1 aSimpson, S., H.1 aZemánek, P.1 aDholakia, K.  uhttps://opg.optica.org/optica/abstract.cfm?URI=optica-9-9-100000578nas a2200193   4500008004100000022001400041245006000055210006000115260001100175300001100186490000800197653000700205653000700212100002500219700002100244700002100265700002000286856007800306       2021                        eng d  a2469-992600aStochastic Hopf bifurcations in vacuum optical tweezers0 aStochastic Hopf bifurcations in vacuum optical tweezers  cOCT 15  a0435180 v10410aLF10aMF1 aSimpson, Stephen, H.1 aArita, Yoshihiko1 aDholakia, Kishan1 aZemánek, Pavel  uhttp://isibrno.cz/cs/stochastic-hopf-bifurcations-vacuum-optical-tweezers01337nas a2200205   4500008004100000022001400041245006800055210006600123300000800189490000600197520075000203653000700953653000700960653000700967100002000974700002300994700002401017700002501041856006501066       2020                        eng d  a2296-424X00aEntropy Production in an Elementary, Light Driven Micro-Machine0 aEntropy Production in an Elementary Light Driven MicroMachine  a5380 v83 a<p>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.</p>10aKF10aLF10aMF1 aBox, Stuart, J.1 aAllen, Michael, P.1 aPhillips, David, B.1 aSimpson, Stephen, H.  uhttps://www.frontiersin.org/article/10.3389/fphy.2020.59312200804nas a2200229   4500008004100000245011300041210006900154300001200223490000700235653000700242653000700249100002200256700002100278700002000299700002000319700002600339700002300365700001800388700002500406700001700431856012600448       2019                        eng d00aOptical Trapping, Optical Binding, and Rotational Dynamics of Silicon	Nanowires in Counter-Propagating Beams0 aOptical Trapping Optical Binding and Rotational Dynamics of Sili  a342-3520 v1910aLF10aMF1 aDonato, Maria, G.1 aBrzobohatý, Oto1 aSimpson, S., H.1 aIrrera, Alessia1 aLeonardi, Antonio, A.1 aFaro, Maria, J. Lo1 aSvak, Vojtech1 aMaragò, Onofrio, M.1 aZemánek, P.  uhttp://isibrno.cz/cs/optical-trapping-optical-binding-and-rotational-dynamics-silicon-nanowires-counter-propagating-beams00696nas a2200205   4500008004100000245011100041210006900152300000900221490000600230653000700236653000700243100001800250700002100268700001400289700001300303700001500316700001700331700002000348856012200368       2018                        eng d00aTransverse spin forces and non-equilibrium particle dynamics in a circularly polarized vacuum optical trap0 aTransverse spin forces and nonequilibrium particle dynamics in a  a54530 v910aLF10aMF1 aSvak, Vojtech1 aBrzobohatý, Oto1 aŠiler, M1 aJákl, P1 aKaňka, J.1 aZemánek, P.1 aSimpson, S., H.  uhttp://isibrno.cz/cs/transverse-spin-forces-and-non-equilibrium-particle-dynamics-circularly-polarized-vacuum-optical00476nas a2200181   4500008004100000245003300041210003300074300001400107490000700121653000700128653000700135100002000142700001700162700002500179700002200204700001700226856005100243       2017                        eng d00aOptical Binding of Nanowires0 aOptical Binding of Nanowires  a3485-34920 v1710aLF10aMF1 aSimpson, S., H.1 aZemánek, P.1 aMaragò, Onofrio, M.1 aJones, Philip, H.1 aHanna, Simon  uhttp://isibrno.cz/cs/optical-binding-nanowires00552nas a2200181   4500008004100000245005100041210005000092300001600142490000700158653000700165100002100172700002700193700002000220700002200240700002600262700001700288856006500305       2016                        eng d00aChiral particles in the dual-beam optical trap0 aChiral particles in the dualbeam optical trap  a26382-263910 v2410aMF1 aBrzobohatý, Oto1 aHernandez, Raul, Josue1 aSimpson, S., H.1 aMazzulla, Alfredo1 aCipparrone, Gabriella1 aZemánek, P.  uhttp://isibrno.cz/cs/chiral-particles-dual-beam-optical-trap00825nas a2200241   4500008004100000245012200041210006900163300001200232490000700244653000700251100001900258700002300277700002100300700002000321700001500341700001600356700001600372700001900388700002100407700001900428700001300447856012300460       2016                        eng d00aDirect measurements of the extraordinary optical momentum and transverse spin-dependent force using a nano-cantilever0 aDirect measurements of the extraordinary optical momentum and tr  a731-7350 v1210aMF1 aAntognozzi, M.1 aBermingham, C., R.1 aHarniman, R., L.1 aSimpson, S., H.1 aSenior, J.1 aHayward, R.1 aHoerber, H.1 aDennis, M., R.1 aBekshaev, A., Y.1 aBliokh, K., Y.1 aNori, F.  uhttp://isibrno.cz/cs/direct-measurements-extraordinary-optical-momentum-and-transverse-spin-dependent-force-using-nano00779nas a2200217   4500008004100000245010600041210006900147300001400216490000700230653000700237100002000244700002400264700001900288700002000307700001700327700002200344700002200366700003200388700002500420856011600445       2016                        eng d00aPhotonic Torque Microscopy of the Nonconservative Force Field for Optically Trapped Silicon Nanowires0 aPhotonic Torque Microscopy of the Nonconservative Force Field fo  a4181-41880 v1610aMF1 aIrrera, Alessia1 aMagazzu, Alessandro1 aArtoni, Pietro1 aSimpson, S., H.1 aHanna, Simon1 aJones, Philip, H.1 aPriolo, Francesco1 aGucciardi, Pietro, Giuseppe1 aMaragò, Onofrio, M.  uhttp://isibrno.cz/cs/photonic-torque-microscopy-nonconservative-force-field-optically-trapped-silicon-nanowires00579nas a2200169   4500008004100000245009000041210006900131300001200200490000600212653000700218100001600225700001600241700002000257700001500277700001700292856010000309       2016                        eng d00aPrecise, contactless measurement of the surface tension of picolitre aerosol droplets0 aPrecise contactless measurement of the surface tension of picoli  a274-2850 v710aMF1 aBzdek, B.R.1 aPower, R.M.1 aSimpson, S., H.1 aReid, J.P.1 aRoyall, C.P.  uhttp://isibrno.cz/cs/precise-contactless-measurement-surface-tension-picolitre-aerosol-droplets00502nas a2200145   4500008004100000245007200041210006900113300001100182490000700193653000700200100002000207700002200227700001700249856009000266       2016                        eng d00aSynchronization of colloidal rotors through angular optical binding0 aSynchronization of colloidal rotors through angular optical bind  a0238420 v9310aMF1 aSimpson, S., H.1 aChvátal, Lukáš1 aZemánek, P.  uhttp://isibrno.cz/cs/synchronization-colloidal-rotors-through-angular-optical-binding00691nas a2200193   4500008004100000245010700041210006900148300001400217490000700231653000700238100002100245700002600266700001400292700002200306700001300328700002000341700001700361856011900378       2015                        eng d00aComplex rotational dynamics of multiple spheroidal	particles in a circularly polarized, dual beam trap0 aComplex rotational dynamics of multiple spheroidal particles in   a7273-72870 v2310aMF1 aBrzobohatý, Oto1 aArzola, Alejandro, V.1 aŠiler, M1 aChvátal, Lukáš1 aJákl, P1 aSimpson, S., H.1 aZemánek, P.  uhttp://isibrno.cz/cs/complex-rotational-dynamics-multiple-spheroidal-particles-circularly-polarized-dual-beam-trap00508nas a2200157   4500008004100000245006600041210006600107300001100173490000700184653000700191100001200198700001500210700002100225700002000246856008400266       2015                        eng d00aTransitional behavior in hydrodynamically coupled oscillators0 aTransitional behavior in hydrodynamically coupled oscillators  a0229160 v9110aMF1 aBox, S.1 aDebono, L.1 aPhillips, D., B.1 aSimpson, S., H.  uhttp://isibrno.cz/cs/transitional-behavior-hydrodynamically-coupled-oscillators