01932nas a2200217 4500008004100000245010600041210006900147260000800216300001600224490000700240520127100247653000701518653000701525100002101532700001901553700002101572700002001593700002001613700002101633856006001654 2024 eng d00aSimulation of optomechanical interaction of levitated nanoparticle with photonic crystal micro cavity0 aSimulation of optomechanical interaction of levitated nanopartic cFeb a7185–71960 v323 a

We propose and analyze theoretically a promising design of an optical trap for vacuum levitation of nanoparticles based on a one-dimensional (1D) silicon photonic crystal cavity (PhC). The considered cavity has a quadratically modulated width of the silicon wave guiding structure, leading to a calculated cavity quality factor of 8 × 105. An effective mode volume of approximately 0.16 μm3 having the optical field strongly confined outside the silicon structure enables optical confinement on nanoparticle in all three dimensions. The optical forces and particle-cavity optomechanical coupling are comprehensively analyzed for two sizes of silica nanoparticles (100 nm and 150 nm in diameter) and various mode detunings. The value of trapping stiffnesses in the microcavity is predicted to be 5 order of magnitudes higher than that reached for optimized optical tweezers, moreover the linear single photon coupling rate can reach MHz level which is 6 order magnitude larger than previously reported values for common bulk cavities. The theoretical results support optimistic prospects towards a compact chip for optical levitation in vacuum and cooling of translational mechanical degrees of motion for the silica nanoparticle of a diameter of 100 nm.

10aLF10aMF1 aMaňka, Tadeáš1 aŠiler, Martin1 aLiška, Vojtěch1 aZemánek, Pavel1 aŠerý, Mojmír1 aBrzobohatý, Oto uhttps://opg.optica.org/oe/abstract.cfm?URI=oe-32-5-718500684nas a2200229 4500008004100000245006200041210006200103300001600165490000700181653000700188653000700195100002100202700002400223700001800247700001600265700001600281700002300297700002500320700002000345700002100365856006800386 2023 eng d00aCold damping of levitated optically coupled nanoparticles0 aCold damping of levitated optically coupled nanoparticles a1203–12090 v1010aLF10aMF1 aLiška, Vojtěch1 aZemánková, Tereza1 aSvak, Vojtech1 aJákl, Petr1 aJežek, Jan1 aBránecký, Martin1 aSimpson, Stephen, H.1 aZemánek, Pavel1 aBrzobohatý, Oto uhttps://opg.optica.org/optica/abstract.cfm?URI=optica-10-9-1203
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