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-32-5-718500840nas a2200277 4500008004100000245012000041210006900161260000800230300001600238490000700254653000800261653000700269653000700276653000700283100002200290700002300312700002700335700001500362700002100377700002400398700002000422700001900442700001800461700002000479856006300499 2023 eng d00aRapid identification of pathogens in blood serum via Raman tweezers in combination with advanced processing methods0 aRapid identification of pathogens in blood serum via Raman tweez cDec a6410–64210 v1410aAIF10aBF10aLF10aMF1 aVaculík, Ondřej1 aBernatová, Silvie1 aRebrošová, Katarína1 aSamek, Ota1 aŠilhan, Lukáš1 ažička, Filip, Rů1 aŠerý, Mojmír1 aŠiler, Martin1 aek, Jan, Jež1 aZemánek, Pavel uhttps://opg.optica.org/boe/abstract.cfm?URI=boe-14-12-641001412nas a2200205 4500008004100000245006700041210006600108300001800174490000700192520080300199653000701002653000701009100002401016700002201040700002001062700001801082700001801100700002301118856006501141 2019 eng d00aLabel-free CARS microscopy through a multimode fiber endoscope0 aLabelfree CARS microscopy through a multimode fiber endoscope a30055–300660 v273 aMultimode fibres have recently been employed as high-resolution ultra-thin endoscopes, capable of imaging biological structures deep inside tissue in vivo. Here, we extend this technique to label-free non-linear microscopy with chemical contrast using coherent anti-Stokes Raman scattering (CARS) through a multimode fibre endoscope, which opens up new avenues for instant and in-situ diagnosis of potentially malignant tissue. We use a commercial 125 &\#x00B5;m diameter, 0.29 NA GRIN fibre, and wavefront shaping on an SLM is used to create foci that are scanned behind the fibre facet across the sample. The chemical selectivity is demonstrated by imaging 2 &\#x00B5;m polystyrene and 2.5 &\#x00B5;m PMMA beads with per pixel integration time as low as 1 ms for epi-detection.
10aKF10aMF1 aTrägårdh, Johanna1 aPikálek, Tomáš1 aŠerý, Mojmír1 aMeyer, Tobias1 aPopp, Jürgen1 aČižmár, Tomáš uhttp://www.opticsexpress.org/abstract.cfm?URI=oe-27-21-30055