Parametric resonance of optically trapped aerosols

R. Di Leonardo, G. Ruocco, J. Leach, M. J. Padgett, A. J. Wright, J. M. Girkin, Daniel Burnham, D. McGloin

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    Abstract

    The Brownian dynamics of an optically trapped water droplet are investigated across the transition from over- to underdamped oscillations. The spectrum of position fluctuations evolves from a Lorentzian shape typical of overdamped systems (beads in liquid solvents) to a damped harmonic oscillator spectrum showing a resonance peak. In this later underdamped regime, we excite parametric resonance by periodically modulating the trapping power at twice the resonant frequency. The power spectra of position fluctuations are in excellent agreement with the obtained analytical solutions of a parametrically modulated Langevin equation. The Brownian dynamics of an optically trapped water droplet are investigated across the transition from over to under-damped oscillations. The spectrum of position fluctuations evolves from a Lorentzian shape typical of over-damped systems (beads in liquid solvents), to a damped harmonic oscillator spectrum showing a resonance peak. In this later under-damped regime, we excite parametric resonance by periodically modulating the trapping power at twice the resonant frequency. The power spectra of position fluctuations are in excellent agreement with the obtained analytical solutions of a parametrically modulated Langevin equation. © 2007 The American Physical Society
    Original languageEnglish
    Pages (from-to)010601-1-010601-4
    JournalPhysical Review Letters
    Volume99
    Issue number1
    DOIs
    Publication statusPublished - 2007

    Keywords

    • Aerosols
    • Lasers and laser optics
    • Laser trapping
    • Optical tweezers

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    Di Leonardo, R., Ruocco, G., Leach, J., Padgett, M. J., Wright, A. J., Girkin, J. M., Burnham, D., & McGloin, D. (2007). Parametric resonance of optically trapped aerosols. Physical Review Letters, 99(1), 010601-1-010601-4. https://doi.org/10.1103/PhysRevLett.99.010601