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<p>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.</p>10aLF10aMF1 aMaňka, Tadeáš1 aŠiler, Martin1 aLiška, Vojtěch1 aZemánek, Pavel1 aŠerý, Mojmír1 aBrzobohatý, Oto  uhttps://opg.optica.org/oe/abstract.cfm?URI=oe-32-5-7185