Parametric Resonance of Optically Trapped Aerosols

Details Parametric Resonance of Optically Trapped Aerosols Parametric Resonance of Optically Trapped Aerosols

2007-02-23

arxiv.org/abs/cond-mat/0702557v1

Phys. Rev. Lett. 99, 010601 (2007)

Physics

Condensed Matter

Statistical Mechanics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.99.010601

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.

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