Parametric resonance of optically trapped aerosols

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

67 Citations (Scopus)


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.

Original languageEnglish
Article number010601
Number of pages4
JournalPhysical Review Letters
Issue number1
Publication statusPublished - 6 Jul 2007

Bibliographical note

Erratum: Parametric resonance of optically trapped aerosols (Physical Review Letters (2007) 90 (010601)) This Letter was published online on 5 July 2007 with a formatting error resulting in Figs. 2 and 3 being inversely placed in the sequence of figures. The figure placement has been corrected as of 6 July 2007. The figures are correct in the printed version of the journal.


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